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Anesthesiology:
Clinical Investigations

Goal-directed Intraoperative Fluid Administration Reduces Length of Hospital Stay after Major Surgery

Gan, Tong J. M.B., B.S, F.R.C.A.*; Soppitt, Andrew B.Sc., M.B., B.S., F.R.C.A.†; Maroof, Mohamed M.D.‡; El-Moalem, Habib Ph.D.§; Robertson, Kerri M. M.D.*; Moretti, Eugene M.D.†; Dwane, Peter M.D.‡; Glass, Peter S. A. M.B., F.F.A. (S.A.)∥

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Abstract

Background: Intraoperative hypovolemia is common and is a potential cause of organ dysfunction, increased postoperative morbidity, length of hospital stay, and death. The objective of this prospective, randomized study was to assess the effect of goal-directed intraoperative fluid administration on length of postoperative hospital stay.
Methods: One hundred patients who were to undergo major elective surgery with an anticipated blood loss greater than 500 ml were randomly assigned to a control group (n = 50) that received standard intraoperative care or to a protocol group (n = 50) that, in addition, received intraoperative plasma volume expansion guided by the esophageal Doppler monitor to maintain maximal stroke volume. Length of postoperative hospital stay and postoperative surgical morbidity were assessed.
Results: Groups were similar with respect to demographics, surgical procedures, and baseline hemodynamic variables. The protocol group had a significantly higher stroke volume and cardiac output at the end of surgery compared with the control group. Patients in the protocol group had a shorter duration of hospital stay compared with the control group: 5 ± 3 versus 7 ± 3 days (mean ± SD), with a median of 6 versus 7 days, respectively (P = 0.03). These patients also tolerated oral intake of solid food earlier than the control group: 3 ± 0.5 versus 4.7 ± 0.5 days (mean ± SD), with a median of 3 versus 5 days, respectively (P = 0.01).
Conclusions: Goal-directed intraoperative fluid administration results in earlier return to bowel function, lower incidence of postoperative nausea and vomiting, and decrease in length of postoperative hospital stay.
INTRAOPERATIVE hypovolemia is common and may be a potential cause of organ dysfunction, increased postoperative morbidity, and death. 1,2 Goal-directed plasma volume expansion during the intraoperative period is associated with improved outcome and reduction in hospital stay in patients undergoing cardiac and major orthopedic surgery. 3–5
The esophageal Doppler monitor (EDM) is an Food and Drug Administration–approved device that permits rapid, minimally invasive, and continuous estimation of cardiac output. 6 The cardiac output measurements obtained with the EDM have been shown to correlate well with the thermodilution method by different investigators. 7–11 Using the EDM to guide intraoperative plasma volume expansion, Sinclair et al.4 demonstrated significant improvement in postoperative recovery and shortened hospital stay in patients undergoing proximal femoral neck fracture repair. Mythen and Webb, 3 in a study in cardiac patients, demonstrated a reduction in the incidence of gastrointestinal mucosal hypoperfusion and major complications in patients who received plasma volume optimization.
In this study, we investigated whether goal-directed intraoperative plasma volume expansion guided by the EDM would shorten the length of hospital stay and improve postoperative outcomes (gastrointestinal and renal dysfunction) in patients undergoing moderate-risk surgery.
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Methods

After we obtained approval from the institutional review board, written informed patient consent was obtained from 100 patients with American Society of Anesthesiologists (ASA) physical status I, II, and III who were to undergo major elective general, urologic, or gynecologic surgery with an anticipated blood loss of greater than 500 ml. Exclusion criteria included patients with age less than 18 yr, emergency surgery, preoperative bowel obstruction, coagulopathy, significant renal and hepatic dysfunction (creatinine > 50% or liver enzymes > 50% upper limit of normal values), congestive heart failure, and esophageal pathology (avoid potential complications of the esophageal probe), and those undergoing gastric or esophageal surgery or who were on antiemetic medication within 3 days of surgery.
All patients were premedicated with midazolam and fentanyl. Before induction of anesthesia, an intravenous bolus of 5 ml/kg lactated Ringer's solution was administered, followed by an intravenous infusion of lactated Ringer's solution at a rate of 5 ml · kg−1 · h−1, which was continued for the duration of surgery. Anesthesia was induced by an intravenous technique and maintained with a balanced inhalational technique incorporating isoflurane 0.5–1.5% and 50% nitrous oxide in oxygen. Tracheal intubation was facilitated with succinylcholine, and neuromuscular blockade was maintained using pancuronium. All patients received 1.25 mg droperidol as a prophylactic antiemetic. Additional fentanyl up to 3 μg · kg−1 · h−1 was given as required. Ventilation was adjusted to maintain arterial carbon dioxide partial pressure at 35–40 mmHg, and temperature was maintained at greater than 35°C throughout surgery. If an epidural catheter was placed preoperatively for postoperative pain management, a 3-ml test dose consisting of lidocaine 1.5% with 1:200,000 epinephrine was administered, and no subsequent epidural local anesthetic drugs were administered intraoperatively. Postoperative analgesia was provided by either epidural (bupivacaine 0.125% and hydromorphone 0.001%) or patient-controlled analgesia with fentanyl. Anesthesia was maintained at a constant level as judged by standard clinical criteria.
Following induction of anesthesia, an esophageal Doppler probe (EDM™; Deltex Medical, Inc., Irving, TX) was greased with lubricating gel and inserted orally into the midesophagus in all patients. Blood flow signals were identified. Once achieved, satisfactory position was maintained by taping the probe cable to either the patient's face or the endotracheal tube. The EDM monitor displays a blood flow velocity waveform that represents the velocity of blood flow within the descending thoracic aorta. A nomogram incorporated in the monitor is used to estimate aortic cross-sectional area, enabling calculation of the left ventricular stroke volume from the area of the velocity–time waveform. This nomogram includes the patient's height, weight, and age. 6 The total amount of time that blood is traveling in a forward direction within the aorta is the systolic flow time. This is corrected for heart rate to give the corrected flow time (FTc). The FTc has been shown to be a good index of systemic vascular resistance and is sensitive to changes in left ventricular preload. 12 Direct intraarterial pressure was monitored in addition to electrocardiography, noninvasive blood pressure, heart rate, end-tidal carbon dioxide tension, temperature, and pulse oximetry. When clinically indicated, a central venous catheter was placed following induction of anesthesia. All cardiovascular variables and urinary flow were monitored and recorded during general anesthesia. Types and volumes of all fluids administered intraoperatively (including but not limited to colloid and crystalloid solutions, blood, and blood products) were recorded, as were the volumes and doses of any drugs given during general anesthesia and an estimation made of blood loss.
Fig. 1
Fig. 1
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Following insertion of the EDM probe, the patients were randomized into either the protocol or control group using a random number generator in sealed envelopes. In the protocol group, boluses of fluid were administered, guided by an algorithm depending on the Doppler estimations of stroke volume and FTc (fig. 1). This algorithm was similar to that used by Sinclair et al.4 A 200-ml aliquot of 6% hydroxyethyl starch in saline was given when the FTc was less than 0.35 s. If the stroke volume was maintained or increased by the fluid challenge and the FTc remained below 0.35 s, the fluid challenge was repeated. If the stroke volume increased by more than 10% and the FTc exceeded 0.35 s, the fluid challenge was repeated until no further increase in stroke volume occurred. If the FTc increased above 0.40 s with no change in stroke volume, further fluid was not then administered until the stroke volume decreased by 10% of the last value. The procedure was started immediately after probe placement and continued every 15 min until maximum stroke volume and targeted FTc values had been reached. Further aliquots of fluid were given to keep the FTc at the targeted values. In addition, patients also received fluid equivalent to that judged to be lost as a result of surgical hemorrhage. When 20 ml/kg of 6% hydroxyethyl starch in saline had been given, lactated Ringer's solution was used for further fluid boluses as required. The designation of an upper limit of 20 ml/kg of 6% hydroxyethyl starch in saline represents the standard practice within our institution. Crystalloid was used in a 3:1 ratio for the replacement of surgical blood loss.
In the control group, the EDM monitor was turned away from the anesthesia care provider, and the screen was covered with an opaque card. The EDM variables were collected by an independent research personnel. Hemodynamic variables triggering fluid administration involved a urinary output less than 0.5 ml · kg−1 · h−1, an increase in heart rate more than 20% above baseline or more than 110 beats/min, a decrease in mean systolic blood pressure less than 20% below baseline or less than 90 mmHg, or central venous pressure less than 20% of baseline. Boluses of 200 ml of fluid were administered until the above target was restored. The anesthesiologists would also administer additional fluid if deemed clinically indicated and were instructed to conduct anesthesia according to their customary practice.
For the treatment of anemia and hypocoagulation, the protocol called for the administration of blood products (erythrocytes, platelets, fresh frozen plasma, cryoprecipitate, or fibrinogen) when clinically indicated and supported by the laboratory evidence of a hematocrit less than 23% or abnormal coagulation (platelet count < 100,000/l, prothrombin time > 1.5 times control, activated partial thromboplastin time > 1.5 times control, or fibrinogen < 100 mg/dl). Patients were extubated, either in the operating room or postoperatively, when they fulfilled standard clinical criteria (adequate protective reflexes, adequate oxygenation, and stable hemodynamics). They were visited daily in the immediate postoperative period by independent research personnel unaware of the patient's randomization until hospital discharge or death. During the visit, the patients were asked specific questions on adverse events and presence of flatus. The information was recorded in a data collection form modified from a previous study in the same institution. 13 Those who had flatus were started on oral fluids, which were followed by solid food if tolerated (without emetic symptoms within 4 h). The length of postoperative stay was recorded. Postoperative care and discharge criteria were predefined using the hospital care map and protocol. Rescue antiemetic treatment (4 mg intravenous ondansetron) was administered with two or more emetic episodes or on patient's request.
Data were analyzed comparing patients in the protocol group with those in the standard practice group on an intent-to-treat basis. The groups were compared using t test or Wilcoxon rank-sum tests as appropriate. The volumes of intravenous colloid and crystalloid administered to the two groups were compared using a one-way analysis of covariance adjusting for each patient's estimated blood loss. The incidence of adverse events was compared using the two-tailed Fisher exact test. A P value < 0.05 was considered statistically significant.
An earlier separate pilot study was conducted with 20 patients to familiarize researchers with the equipment and to determine the feasibility of the proposed methodology. The results were used to estimate the necessary sample size for this prospective study. A sample of 50 patients in each group was calculated to have at least 90% power to detect a difference in mean of length of hospital stay of 2 days between the two groups, using a two-group t test with a 0.05 two-sided significance.
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Results

Table 1
Table 1
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One hundred patients were enrolled. Two patients were not included for analysis (one patient in each group) as neither had their scheduled surgery. The two groups were well matched with regard to demographics, ASA physical status, duration of anesthesia, intraoperative fentanyl use, and type of surgery (table 1).
Table 2
Table 2
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Table 3
Table 3
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The volume of colloid and crystalloid, erythrocyte, and blood product administration for the two groups is shown in table 2. Patients in the protocol group received more 6% hetastarch compared with the control group. Eleven patients in the protocol group received erythrocyte transfusion versus nine in the control group, and one patient each in the protocol group received fresh frozen plasma (351 ml) or platelets (538 ml), respectively. Baseline hemodynamic variables were similar between the two groups (table 3). There were no significant changes in heart rate and mean intraarterial blood pressure between the two periods in both groups. However, there was a significant increase in Doppler-derived variables (stroke volume, cardiac output, and FTc) from baseline to end of surgery in the protocol group compared with the control group (table 3).
Table 4
Table 4
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The length of hospital stay was shorter for the protocol group compared with the control group: 5 ± 3 versus 7 ± 3 days (mean ± SD), 6 versus 7 days (median), respectively (P = 0.03). Patients in the protocol group also tolerated an oral solid regimen earlier than the control group: 3 ± 0.5 versus 4.7 ± 0.5 days (mean ± SD), 3 versus 5 days (median), respectively (P = 0.01). Fewer patients in the protocol group experienced severe postoperative nausea and vomiting requiring rescue antiemetic treatment (P < 0.05;table 4). There were no differences in the incidence of other complications (table 4).
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Discussion

This prospective, randomized, controlled study demonstrates that goal-directed intraoperative fluid administration during major surgery results in earlier gastrointestinal function, a reduction in postoperative complications, and a shortened hospital stay.
Hypovolemia is common among patients scheduled for surgery. In addition to the inevitable losses in the perioperative period caused by surgical trauma, evaporation, and the use of dry anesthetic gases, the majority of patients are routinely required to fast for a minimum of 6 h preoperatively to reduce the risk of acid aspiration syndrome. 14 Hypovolemia during the perioperative period has been associated with a significant increase in postoperative morbidity and mortality, ranging from postoperative nausea and vomiting 15 to more serious complications such as organ dysfunction, 3 as well as prolongation of hospital stay. 4
Bennett-Guerrero et al.13 recently demonstrated that gastrointestinal dysfunction is the most common postoperative complication in patients undergoing moderate-risk surgery, especially those procedures involving laparotomy. Gastrointestinal dysfunction was the most frequent reason for a prolonged length of hospital stay. At postoperative day 5, 55% of the patients studied were unable to tolerate an enteral diet. More than 50% of patients who were still hospitalized on postoperative day 15 exhibited gastrointestinal dysfunction. Their findings echo the results of our study. The reduction in hospital stay observed was primarily the result of patients tolerating a solid regimen earlier. We also found the incidence of severe postoperative nausea and vomiting requiring rescue antiemetic therapy was higher in the control group compared with the protocol group. It is conceivable that improved perfusion of gastric mucosa as a result of additional fluid administration in the protocol group could have resulted in less postoperative nausea and vomiting, as was demonstrated by previous observation. In the same study, Bennett-Guerrero et al.13 found a significant correlation between intraoperative indices of tissue hypoperfusion (e.g., gastric p Hi, arterial base deficit) and gastrointestinal dysfunction. While we did not assess gastric mucosal perfusion, several studies have shown a direct relation between hypovolemia and gut hypoperfusion. 3,16 Hence, it is plausible that the protocol group that had optimal fluid administration during the intraoperative period may have had better gut perfusion, which resulted in a lower incidence of gastrointestinal dysfunction.
We use the EDM to guide intraoperative fluid administration. The EDM is a minimally invasive method for continuous monitoring of the circulation. There is good agreement between measures of cardiac output made simultaneously with the esophageal Doppler and a thermodilution pulmonary arterial catheter. 9,10 Pulmonary arterial catheter insertion, however, requires technical skill and may be associated with life-threatening complications. Despite its widespread use, there is little or limited evidence that the use of a pulmonary arterial catheter benefits patients. Indeed, there is evidence that it may increase morbidity and mortality. 17,18 There are several limitations to the use of EDM. The monitor makes assumptions on the diameter of the aorta based on the weight and height of the patient. There is a learning curve to achieve proficient placement of the probe to capture maximal signal. Insertion of 12 EDM probes appears to be necessary to achieve adequate proficiency. 19 There are other relatively noninvasive devices that measure stroke volume and cardiac output that may also be useful for goal-directed intraoperative fluid administration. These include noninvasive cardiac output using partial carbon dioxide rebreathing, transesophageal echocardiography, Fick indicator dilution technique using lithium, and thoracic impedance.
We used FTc to guide volume replacement as it has been shown to be a more sensitive indicator of cardiac filling than pulmonary arterial diastolic pressure and pulmonary arterial occlusion pressure. 8,20 For pulmonary arterial diastolic pressure or pulmonary arterial occlusion pressure to increase, the left ventricle must be loaded sufficiently to increase left ventricular end-diastolic pressure. In a ventricle with normal diastolic compliance, major volume changes may not produce substantial pressure changes, thus limiting the usefulness of the pulmonary arterial diastolic pressure as a marker for filling. In contrast, the FTc value represents the amount of time required to eject the stroke volume, corrected for heart rate. As the ventricle is filled, it requires more time to eject the greater stroke volume, even in ventricles with normal compliance.
Other investigators have demonstrated that optimal fluid administration during the intraoperative period appears to reduce morbidity and length of hospital stay. Sinclair et al.4 demonstrated that plasma volume augmentation in patients undergoing open reduction of a femur fracture was associated with significantly faster recovery, with a reduction in the median time to being medically fit for discharge from 15 to 10 days, compared with a control group. In another study, Mythen and Webb 3 demonstrated that esophageal Doppler-guided plasma volume augmentation significantly reduced the incidence of gastric mucosal hypoperfusion (56% to 7%) with significantly reduced complication rates and length of hospital stay following cardiac surgery. No patients in the treatment group developed major complications compared with six in the control group. The mean hospital stay was also shorter in the treatment group (6.4 vs. 10.1 days;P = 0.01). This improvement in outcome could potentially reduce healthcare costs. The results from these two studies are consistent with our findings and suggest that proactive intraoperative fluid administration can improve postoperative recovery in patients undergoing moderate- to high-risk surgery. However, this study does not address if optimal fluid administration without the EDM would result in similar benefits. This requires further investigation. Nevertheless, intraoperative fluid augmentation appears to confer significant benefits compared with customary practice.
In the current study, we have also demonstrated that routinely measured standard cardiovascular variables such as blood pressure, heart rate, and oxygen saturation were unreliable indicators of mild hypovolemia. This has been previously demonstrated. 3,4 The immediate response to a reduction in circulating blood volume is redirection of blood flow from less vital organs, e.g., splanchnic bed, in favor of organs that are more sensitive to ischemia. 21 The measurement of normal central venous pressure or pulmonary arterial occlusion pressure will not exclude hypovolemia unless the response to a fluid challenge is considered. 22 Baek et al.23 found that more than half of a group of high-risk postoperative patients developed a decrease in central venous pressure and pulmonary arterial occlusion pressure in response to plasma volume expansion. While we only studied patients with no known history of congestive cardiac failure, it would not be possible to speculate if fluid administration guided by EDM would have a detrimental effect on patients with compromised myocardial function or perfusion.
There are limitations in this study. While the data were collected by independent dedicated research personnel not involved in the intraoperative management of patients, we were unable to blind the anesthesiologists as to the treatment group, and hence may have introduced bias. However, intraoperative fluid administration in both groups was guided by specific fluid administration protocols, which should minimize bias. It is conceivable that the use of certain medications intraoperatively as well as postoperatively may have influenced bowel function (i.e., postoperative epidural analgesia, intraoperative nitrous oxide, and postoperative opioid). Nitrous oxide was used in all patients. There was no difference in the number of patients who received epidural or patient-controlled analgesia between the groups, and the pain scores and opioid use were similar. All patients were visited daily in the postoperative period, and all adverse events were systematically collected. Patients in the protocol group also received, on average, larger volumes of hetastarch compared with the control group, as we wanted the control group to simulate as close as possible to receive “standard of care.” Hence, the differences between the groups could be attributed to the differences in the type of fluids administered. While there were five more females in the control group compared with the protocol group, these differences were not statistically significant. The overall difference in hospital length of stay between the groups was admittedly small, a difference of 1 day (median) or 2 days (mean). These differences could be a result of unidentified group differences and factors other than goal-directed fluid administration.
In summary, for patients undergoing moderate- and high-risk surgery, goal-directed fluid administration with 6% hetastarch is associated with improved patient outcome and a slight reduction in the length of hospital stay.
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References

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American Journal of Veterinary Research
Fluid balance, glomerular filtration rate, and urine output in dogs anesthetized for an orthopedic surgical procedure
Boscan, P; Pypendop, BH; Siao, KT; Francey, T; Dowers, K; Cowgill, L; Ilkiw, JE
American Journal of Veterinary Research, 71(5): 501-507.

Anaesthesia
Evaluation of a trans-oesophageal Doppler probe in awake subjects
English, JD; Moppett, IK
Anaesthesia, 60(7): 720-721.

Anesthesia and Analgesia
Less is not more: A lack of evidence for intraoperative fluid restriction improving outcome after major elective gastrointestinal surgery
Hamilton, MA; Mythen, MG; Ackland, GL
Anesthesia and Analgesia, 102(3): 970-971.

British Journal of Surgery
Randomized clinical trial assessing the effect of Doppler-optimized fluid management on outcome after elective colorectal resection
Noblett, SE; Snowden, CP; Shenton, BK; Horgan, AF
British Journal of Surgery, 93(9): 1069-1076.
10.1002/bjs.5454
CrossRef
Journal of Cardiothoracic and Vascular Anesthesia
Arterial pressure-based cardiac output assessment
Maus, TM; Lee, DE
Journal of Cardiothoracic and Vascular Anesthesia, 22(3): 468-473.
10.1053/j.jvca.2008.03.012
CrossRef
British Journal of Anaesthesia
Pleth variability index to monitor the respiratory variations in the pulse oximeter plethysmographic waveform amplitude and predict fluid responsiveness in the operating theatre
Cannesson, M; Desebbe, O; Rosamel, P; Delannoy, B; Robin, J; Bastien, O; Lehot, JJ
British Journal of Anaesthesia, 101(2): 200-206.
10.1093/bja/aen133
CrossRef
Anesthesia and Analgesia
Transurethral resection syndrome detected and managed using transesophageal Doppler
Schober, P; Meuleman, EJH; Boer, C; Loer, SA; Schwarte, LA
Anesthesia and Analgesia, 107(3): 921-925.
10.1213/ane.0b013e31817b84f4
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Anaesthesist
Determinants of insensible fluid loss. Perspiration, protein shift and endothelial glycocalyx
Jacob, M; Chappell, D; Hofmann-Kiefer, K; Conzen, P; Peter, K; Rehm, M
Anaesthesist, 56(8): 747-+.
10.1007/s00101-007-1235-4
CrossRef
British Journal of Anaesthesia
Evaluation of corrected flow time in oesophageal Doppler as a predictor of fluid responsiveness
Lee, JH; Kim, JT; Yoon, SZ; Lim, YJ; Jeon, Y; Bahk, JH; Kim, CS
British Journal of Anaesthesia, 99(3): 343-348.
10.1093/bja/aem179
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Anasthesiologie & Intensivmedizin
Minimally invasive measurement of cardiac output - essential or not?
Kubitz, JC; Richter, HP; Reuter, DA; Goetz, AE
Anasthesiologie & Intensivmedizin, 50(): 389-400.

British Journal of Anaesthesia
Evaluation of stroke volume variation obtained by arterial pulse contour analysis to predict fluid responsiveness intraoperatively
Lahner, D; Kabon, B; Marschalek, C; Chiari, A; Pestel, G; Kaider, A; Fleischmann, E; Hetz, H
British Journal of Anaesthesia, 103(3): 346-351.
10.1093/bja/aep200
CrossRef
Gefasschirurgie
Abdominal aortic aneurysms
Debus, ES; Kolbel, T; Bockler, D; Eckstein, HH
Gefasschirurgie, 15(3): 154-+.
10.1007/s00772-009-0755-4
CrossRef
Annales Francaises D Anesthesie Et De Reanimation
Volume expansion monitoring: new indices, new practices?
Tavernier, B; Jeanne, M
Annales Francaises D Anesthesie Et De Reanimation, 24(5): 469-470.
10.1016/j.annfar.2005.03.001
CrossRef
Anesthesia and Analgesia
Perioperative fluid management and clinical outcomes in adults
Grocott, MPW; Mythen, MG; Gan, TJ
Anesthesia and Analgesia, 100(4): 1093-1106.

Annales Francaises D Anesthesie Et De Reanimation
Which benefit for patient can we expect from hyperhydratation and haemodynamic pre- and postoperative optimization? (II)
Cheisson, G; Duranteau, J
Annales Francaises D Anesthesie Et De Reanimation, 24(2): 199-205.
10.1016/j.annfar.2004.12.028
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Anasthesiologie & Intensivmedizin
Perioperative fluid therapy: Basic principles - controversies - strategies
Luecke, T
Anasthesiologie & Intensivmedizin, 46(): 298-+.

Anaesthesist
Perioperative fluid management. An analysis of the present situation
Zausig, Y; Weigand, M; Graf, B
Anaesthesist, 55(4): 371-+.
10.1007/s00101-006-0988-5
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Minerva Anestesiologica
Risks, benefits, alternatives and indications of allogenic blood transfusions
Madjdpour, C; Heindl, V; Spahn, DR
Minerva Anestesiologica, 72(5): 283-298.

Critical Care
Multicentre study on peri- and postoperative central venous oxygen saturation in high-risk surgical patients
Bracht, H; Eigenmann, V; Haenggi, M; Inderbitzin, D; Jakob, SM; Loher, S; Raeber, C; Takala, J; Vogt, A; Makinen, K; Miettinen, P; Niskanen, M; Parviainen, I; Leppikangas, H; Nunes, S; Ruokonen, E
Critical Care, 10(6): -.
ARTN R158
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Anesthesia and Analgesia
CON: Fluid restriction for cardiac patients during major noncardiac surgery should be replaced by goal-directed intravascular fluid administration
Spahn, DR; Chassot, PG
Anesthesia and Analgesia, 102(2): 344-346.
10.1213/01.ane.0000196511.48033.0b
CrossRef
Anesthesia and Analgesia
Perioperative fluid management
Prough, DS; Svensen, CH
Anesthesia and Analgesia, (): 84-91.

Anesthesia and Analgesia
Liberal versus restrictive fluid management in knee arthroplasty: A randomized, double-blind study
Holte, K; Kristensen, BB; Valentiner, L; Foss, NB; Husted, H; Kehlet, H
Anesthesia and Analgesia, 105(2): 465-474.
10.1213/01.ane.0000263268.08222.19
CrossRef
Journal of Clinical Epidemiology
The Postoperative Morbidity Survey was validated and used to describe morbidity after major surgery
Grocott, MPW; Browne, JP; Van der Meulen, J; Matejowsk, C; Mutch, M; Hamilton, MA; Levett, DZH; Emberton, M; Haddad, FS; Mythen, MG
Journal of Clinical Epidemiology, 60(9): 919-928.
10.1016/j.jclinepi.2006.12.003
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International Journal of Clinical Practice
Doppler-guided intral-operative fluid management during major abdominal surgery: systematic review and meta-analysis
Walsh, SR; Tang, T; Bass, S; Gaunt, ME
International Journal of Clinical Practice, 62(3): 466-470.
10.1111/j.1742-1241.2007.01516.x
CrossRef
Current Drug Targets
Reducing the Risk of Major Elective Non-cardiac Surgery: Is there a Role for Levosimendan in the Preoperative Optimization of Cardiac Function?
Morelli, A; Ertmer, C; Pietropaoli, P; Westphal, M
Current Drug Targets, 10(9): 863-871.

British Journal of Anaesthesia
Effect of intraoperative intravenous crystalloid infusion on postoperative nausea and vomiting after gynaecological laparoscopy: comparison of 30 and 10 ml kg(-1)
Magner, JJ; McCaul, C; Carton, E; Gardiner, J; Buggy, D
British Journal of Anaesthesia, 93(3): 381-385.
10.1093/bja/aeh219
CrossRef
Anesthesia and Analgesia
Postoperative gastrointestinal tract dysfunction
Mythen, MG
Anesthesia and Analgesia, 100(1): 196-204.
10.1213/01.ANE.0000139376.45591.17
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British Journal of Anaesthesia
Predicting fluid responsiveness in patients undergoing cardiac surgery: functional haemodynamic parameters including the Respiratory Systolic Variation Test and static preload indicators
Preisman, S; Kogan, S; Berkenstadt, H; Perel, A
British Journal of Anaesthesia, 95(6): 746-755.
10.1093/bja/aei262
CrossRef
Journal of Cardiothoracic and Vascular Anesthesia
Perioperative Transthoracic Echocardiography: "Universal Acid"?
Manecke, GR; Vezina, DP
Journal of Cardiothoracic and Vascular Anesthesia, 23(4): 447-449.
10.1053/j.jvca.2009.05.024
CrossRef
Annals of the Royal College of Surgeons of England
Low plasma albumin linked to fluid overload in postoperative epidural patients
Malhotra, K; Axisa, B
Annals of the Royal College of Surgeons of England, 91(8): 703-707.
10.1308/003588409X12486167522072
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Journal of Cardiothoracic and Vascular Anesthesia
Pro: The General Anesthesiologist Should Be Trained and Certified in Transesophageal Echocardiography
Goldstein, S
Journal of Cardiothoracic and Vascular Anesthesia, 24(1): 183-188.
10.1053/j.jvca.2009.09.008
CrossRef
European Journal of Applied Physiology
A definition of normovolaemia and consequences for cardiovascular control during orthostatic and environmental stress
Truijen, J; Bundgaard-Nielsen, M; van Lieshout, JJ
European Journal of Applied Physiology, 109(2): 141-157.
10.1007/s00421-009-1346-5
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Critical Care
Changes in aortic blood flow induced by passive leg raising predict fluid responsiveness in critically ill patients
Lafanechere, A; Pene, F; Goulenok, C; Delahaye, A; Mallet, V; Choukroun, G; Chiche, JD; Mira, JP; Cariou, A
Critical Care, 10(5): -.
ARTN R132
CrossRef
Journal of Cardiothoracic and Vascular Anesthesia
Cardiac output from the arterial catheter: Deceptively simple
Manecke, GR
Journal of Cardiothoracic and Vascular Anesthesia, 21(5): 629-631.
10.1053/j.jvca.2007.07.001
CrossRef
Canadian Journal of Surgery
Substantial variation of both opinions and practice regarding perioperative fluid resuscitation
Chong, PC; Greco, EF; Stothart, D; Maziak, DE; Sundaresan, S; Shamji, FM; Neilipovitz, D; McIntyre, L; Hebert, P; Seely, AJE
Canadian Journal of Surgery, 52(3): 207-214.

Anaesthesist
Haemodynamic monitoring in the perioperative phase
Wittkowski, U; Spies, C; Sander, M; Erb, J; Feldheiser, A; von Heymann, C
Anaesthesist, 58(8): 764-+.
10.1007/s00101-009-1590-4
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Annales De Chirurgie
Rapid rehabilitation after abdominal surgery. The anaesthesist point of view
Beaussier, M; Delva, E
Annales De Chirurgie, 129(): 10-16.

British Journal of Anaesthesia
Intraoperative oesophageal Doppler guided fluid management shortens postoperative hospital stay after major bowel surgery
Wakeling, HG; McFall, MR; Jenkins, CS; Woods, WGA; Miles, WFA; Barclay, GR; Fleming, SC
British Journal of Anaesthesia, 95(5): 634-642.
10.1093/bja/aei223
CrossRef
British Journal of Hospital Medicine
Optimal intraoperative haemodynamic management
Cook, M; Rhodes, A
British Journal of Hospital Medicine, 66(8): 448-451.

International Journal of Colorectal Disease
Hypovolemia after traditional preoperative care in patients undergoing colonic surgery is underrepresented in conventional hemodynamic monitoring
Junghans, T; Neuss, H; Strohauer, M; Raue, W; Haase, O; Schink, T; Schwenk, W
International Journal of Colorectal Disease, 21(7): 693-697.
10.1007/s00384-005-0065-6
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British Journal of Hospital Medicine
Doppler cardiac output monitoring: a tool for all physicians
Usher, SM; Walker, DA; Mythen, MG
British Journal of Hospital Medicine, 68(3): 126-130.

Heart Failure Reviews
Haemodynamic monitoring in acute heart failure
Cecconi, M; Reynolds, TE; Al-Subaie, N; Rhodes, A
Heart Failure Reviews, 12(2): 105-111.
10.1007/s10741-007-9010-9
CrossRef
Veterinary Anaesthesia and Analgesia
Plasma colloid osmotic pressure and total protein in horses during colic surgery
Boscan, P; Steffey, EP
Veterinary Anaesthesia and Analgesia, 34(6): 408-415.
10.1111/j.1467-2995.2006.00342.x
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International Journal of Clinical Practice
Doppler-guided intra-operative fluid management during major abdominal surgery: a systematic review and meta-analysis (Int J Clin Pract 2007 ; November 21: Epub ahead of print)
Teeuwen, PHE; Bremers, AJA; Bleichrodt, RP
International Journal of Clinical Practice, 62(4): 649.
10.1111/j.1742-1241.2008.01706.x
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Health Technology Assessment
Systematic review of the clinical effectiveness and cost-effectiveness of oesophageal Doppler monitoring in critically ill and high-risk surgical patients
Mowatt, G; Houston, G; Hernandez, R; de Verteuil, R; Fraser, C; Cuthbertson, B; Vale, L
Health Technology Assessment, 13(7): 1-+.

British Journal of Anaesthesia
Goal-directed haemodynamic therapy and gastrointestinal complications in major surgery: a meta-analysis of randomized controlled trials
Giglio, MT; Marucci, M; Testini, M; Brienza, N
British Journal of Anaesthesia, 103(5): 637-646.
10.1093/bja/aep279
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Anasthesiologie & Intensivmedizin
Perioperative haemodynamic monitoring
Rex, S; de Waal, EEC; Buhre, W
Anasthesiologie & Intensivmedizin, 51(): 160-175.

Anesthesia and Analgesia
An assessment of two different methods of left ventricular ejection time measurement by transesophageal echocardiography
Swaminathan, M; Phillips-Bute, BG; Mathew, JP
Anesthesia and Analgesia, 97(3): 642-647.
10.1213/01.ANE.0000074125.74597.20
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Annales Francaises D Anesthesie Et De Reanimation
Perioperative acute renal failure - Long text
[Anon]
Annales Francaises D Anesthesie Et De Reanimation, 24(2): 87-119.
10.1016/j.annfar.2004.12.007
CrossRef
Anaesthesia, Pain, Intensive Care and Emergency Medicine - Apice 19
Haernodynamic standardisation procedures in high-risk surgery
Yamaguti, T; Kim, SMY; Auler, JOC
Anaesthesia, Pain, Intensive Care and Emergency Medicine - Apice 19, (): 437-448.

Hospital Medicine
Optimal intraoperative haemodynamic management
Cook, M; Rhodes, A
Hospital Medicine, 66(8): 448-451.

Critical Care
Equipment review: The success of early goal-directed therapy for septic shock prompts evaluation of current approaches for monitoring the adequacy of resuscitation
Gunn, SR; Fink, MP; Wallace, B
Critical Care, 9(4): 349-359.
10.1186/cc3725
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Anesthesia and Analgesia
Supplemental intravenous crystalloid administration does not reduce the risk of surgical wound infection
Kabon, B; Akca, O; Taguchi, A; Nagele, A; Jebadurai, R; Arkilic, CF; Sharma, N; Ahluwalia, A; Galandiuk, S; Fleshman, J; Sessler, DI; Kurz, A
Anesthesia and Analgesia, 101(5): 1546-1553.
10.1213/01.ANE.0000180217.57952.FE
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Anesthesia and Analgesia
The role of the anesthesiologist in fast-track surgery: From multimodal analgesia to perioperative medical care
White, PF; Kehlet, H; Neal, JM; Schricker, T; Carr, DB; Carli, F
Anesthesia and Analgesia, 104(6): 1380-1396.
10.1213/01.ane.0000263034.96885.e1
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Acta Anaesthesiologica Scandinavica
Influence of pre-operative fluid infusion on volume status during oesophageal resection - a prospective trial
Raue, W; Haase, O; Langelotz, C; Neuss, H; Muller, JM; Schwenk, W
Acta Anaesthesiologica Scandinavica, 52(9): 1218-1225.
10.1111/j.1399-6576.2008.01759.x
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European Surgical Research
Volume Therapy and Cardiocircular Function during Hyperthermic Intraperitoneal Chemotherapy
Raue, W; Tsilimparis, N; Bloch, A; Menenakos, C; Hartmann, J
European Surgical Research, 43(4): 365-372.
10.1159/000248164
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Critical Care Clinics
Hemodynamic Monitoring in Sepsis
Casserly, B; Read, R; Levy, MM
Critical Care Clinics, 25(4): 803-+.
10.1016/j.ccc.2009.08.006
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British Journal of Anaesthesia
Abilities of pulse pressure variations and stroke volume variations to predict fluid responsiveness in prone position during scoliosis surgery
Biais, M; Bernard, O; Ha, JC; Degryse, C; Sztark, F
British Journal of Anaesthesia, 104(4): 407-413.
10.1093/bja/aeq031
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Journal of Clinical Anesthesia
Comparison of cardiac output as assessed by transesophageal echo-Doppler and transpulmonary thermodilution in patients undergoing thoracic surgery
Diaper, J; Ellenberger, C; Villiger, Y; Robert, J; Inan, C; Tschopp, JM; Licker, M
Journal of Clinical Anesthesia, 22(2): 97-103.
10.1016/j.jclinane.2009.03.013
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Anesthesia and Analgesia
A comparison of changes in cardiac preload variables during graded hypovolemia and hypervolemia in mechanically ventilated dogs
Fujita, Y; Yamamoto, T; Sano, I; Yoshioka, N; Hinenoya, H
Anesthesia and Analgesia, 99(6): 1780-1786.
10.1213/01.ANE.0000136776.35317.EC
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British Journal of Surgery
Randomized clinical trial of the effects of oral preoperative carbohydrates on postoperative nausea and vomiting after laparoscopic cholecystectomy
Hausel, J; Nygren, J; Thorell, A; Lagerkranser, M; Ljungqvist, O
British Journal of Surgery, 92(4): 415-421.
10.1002/bjs.4901
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Intensive Care Medicine
Stroke output variations calculated by esophageal Doppler is a reliable predictor of fluid response
Vallee, F; Fourcade, O; De Soyres, O; Angles, O; Sanchez-Verlaan, P; Pillard, F; Smail, N; Olivier, M; Genestal, M; Samii, K
Intensive Care Medicine, 31(): 1388-1393.
10.1007/s00134-005-2768-0
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Journal of the American College of Surgeons
Fluid therapy and surgical outcomes in elective surgery: A need for reassessment in fast-track surgery
Holte, K; Kehlet, H
Journal of the American College of Surgeons, 202(6): 971-989.
10.1016/j.jamcollsurg.2006.01.003
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British Journal of Hospital Medicine
Managing critically ill patients with a pulmonary artery catheter
Harvey, S; Singer, M
British Journal of Hospital Medicine, 67(8): 421-426.

Critical Care
Esophageal Doppler-guided fluid management decreases blood lactate levels in multiple-trauma patients: a randomized controlled trial
Chytra, I; Pradl, R; Bosman, R; Pelnar, P; Kasal, E; Zidkova, A
Critical Care, 11(1): -.
ARTN R24
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Anaesthesia
Systematic review of the literature for the use of oesophageal Doppler monitor for fluid replacement in major abdominal surgery
Abbas, SM; Hill, AG
Anaesthesia, 63(1): 44-51.
10.1111/j.1365-2044.2007.05233.x
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Regional Anesthesia and Pain Medicine
Near-total esophagectomy: The influence of standardized multimodal management and intraoperative fluid restriction
Neal, JM; Wilcox, RT; Allen, HW; Low, DE
Regional Anesthesia and Pain Medicine, 28(4): 328-334.
10.1016/S1098-7339(03)00197-4
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Journal of Cardiothoracic and Vascular Anesthesia
Acute normovolemic hemodilution: Physiology, limitations, and clinical use
Jamnicki, M; Kocian, R; van der Linden, P; Zaugg, M; Spahn, DR
Journal of Cardiothoracic and Vascular Anesthesia, 17(6): 747-754.
10.1053/j.jvca.2003.09.018
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Surgical Endoscopy and Other Interventional Techniques
Optimization of cardiac preload during laparoscopic donor nephrectomy - A preliminary study of central venous pressure vs esophageal Doppler monitoring
Feldman, LS; Anidjar, M; Metrakos, P; Stanbridge, D; Fried, GM; Carli, F
Surgical Endoscopy and Other Interventional Techniques, 18(3): 412-416.
10.1007/s00464-003-8907-1
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Anaesthesia
Monitoring guidelines: a missed opportunity?
Simpson, A; Levy, N
Anaesthesia, 62(8): 857-858.

Acta Anaesthesiologica Scandinavica
Stroke volume averaging for individualized goal-directed fluid therapy with oesophageal Doppler
Jorgensen, CC; Bundgaard-Nielsen, M; Skovgaard, LT; Secher, NH; Kehlet, H
Acta Anaesthesiologica Scandinavica, 53(1): 34-38.
10.1111/j.1399-6576.2008.01785.x
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Critical Care
Crystalloids versus colloids for goal-directed fluid therapy in major surgery
Hiltebrand, LB; Kimberger, O; Arnberger, M; Brandt, S; Kurz, A; Sigurdsson, GH
Critical Care, 13(2): -.
ARTN R40
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Intensive Care Medicine
Gastric hypercarbia and adverse outcome after cardiac surgery
Kavarana, MN; Frumento, RJ; Hirsch, AL; Oz, MC; Lee, DC; Bennett-Guerrero, E
Intensive Care Medicine, 29(5): 742-748.
10.1007/s00134-003-1687-1
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Annals of Clinical Biochemistry
Postoperative serum urea is associated with 30-day mortality in patients undergoing emergency abdominal surgery
Harten, J; Hay, A; McMillan, DC; McArdle, CS; O'Reilly, DS; Kinsella, J
Annals of Clinical Biochemistry, 43(): 295-299.

Acta Anaesthesiologica Scandinavica
Monitoring of peri-operative fluid administration by individualized goal-directed therapy
Bundgaard-Nielsen, M; Holte, K; Secher, NH; Kehlet, H
Acta Anaesthesiologica Scandinavica, 51(3): 331-340.
10.1111/j.1399-6576.2006.01221.x
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Critical Care
Pulse pressure variation: beyond the fluid management of patients with shock
Michard, F; Lopes, MR; Auler, JOC
Critical Care, 11(3): -.
ARTN 131
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Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie
3.5% urea-linked gelatin is as effective as 6% HES 200/0.5 for volume management in cardiac surgery patients
Van der Linden, PJ; De Hert, SG; Daper, A; Trenchant, A; Schmartz, D; Defrance, P; Kimbimbi, P
Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie, 51(3): 236-241.

Critical Care Clinics
Transfusion in the cardiac patient
Spahn, DR; Dettori, N; Kocian, R; Chassot, PG
Critical Care Clinics, 20(2): 269-+.
10.1016/S0749-0704(03)00112-X
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Surgical Endoscopy and Other Interventional Techniques
Intraoperative fluid management in laparoscopic live-donor nephrectomy - Challenging the dogma
Bergman, S; Feldman, LS; Carli, F; Anidjar, M; Vassiliou, MC; Andrew, CG; Stanbridge, DD; Fried, GM
Surgical Endoscopy and Other Interventional Techniques, 18(): 1625-1630.
10.1007/s00464-004-8811-3
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Anesthesia and Analgesia
Risk factors for postoperative nausea and vomiting
Gan, TJ
Anesthesia and Analgesia, 102(6): 1884-1898.
10.1213/01.ANE.0000219597.16143.4D
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Anesthesia and Analgesia
Intravascular fluid administration and hemodynamic performance during open abdominal surgery
Svensen, CH; Olsson, J; Hahn, RG
Anesthesia and Analgesia, 103(3): 671-676.
10.1213/01.ane.0000226092.48770.fe
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Intensive Care Medicine
What type of monitoring has been shownto improve outcomes in acutely ill patients?
Ospina-Tascon, GA; Cordioli, RL; Vincent, JL
Intensive Care Medicine, 34(5): 800-820.
10.1007/s00134-007-0967-6
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Expert Opinion on Pharmacotherapy
Pharmacological interventions and concepts of fast-track perioperative medical care for enhanced recovery programs
Kranke, P; Redel, A; Schuster, F; Muellenbach, R; Eberhart, L
Expert Opinion on Pharmacotherapy, 9(9): 1541-1564.
10.1517/14656560802098402
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Medicina-Lithuania
A volume loading test for the detection of hypovolemia and dehydration
Hahn, RG; Andrijauskas, A; Drobin, D; Svensen, C; Ivaskevicius, J
Medicina-Lithuania, 44(): 953-959.

British Journal of Anaesthesia
Neurokinin-1 receptor antagonists in the prevention of postoperative nausea and vomiting
Diemunsch, P; Joshi, GP; Brichant, JF
British Journal of Anaesthesia, 103(1): 7-13.
10.1093/bja/aep125
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Anesthesia and Analgesia
Perioperative Hemodynamic Monitoring with Transesophageal Doppler Technology
Schober, P; Loer, SA; Schwarte, LA
Anesthesia and Analgesia, 109(2): 340-353.
10.1213/ane.0b013e3181aa0af3
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British Journal of Oral & Maxillofacial Surgery
Optimisation of intraoperative haemodynamics: early experience of its use in major head and neck surgery
Abdel-Galil, K; Craske, D; McCaul, J
British Journal of Oral & Maxillofacial Surgery, 48(3): 189-191.
10.1016/j.bjoms.2009.08.029
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Intensive Care Medicine
What's in a beat?
Singer, M
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Echocardiography-A Journal of Cardiovascular Ultrasound and Allied Techniques
Esophageal Doppler: Noninvasive cardiac output monitor
Cholley, BP; Singer, M
Echocardiography-A Journal of Cardiovascular Ultrasound and Allied Techniques, 20(8): 763-769.

British Medical Journal
Randomised controlled trial assessing the impact of a nurse delivered, flow monitored protocol for optimisation of circulatory status after cardiac surgery
McKendry, M; McGloin, H; Saberi, D; Caudwell, L; Brady, AR; Singer, M
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Critical Care
Bench-to-bedside review: Routine postoperative use of the nasogastric tube - utility or futility?
Tanguy, M; Seguin, P; Malledant, Y
Critical Care, 11(1): -.
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Anesthesia and Analgesia
Fluid therapy might be more difficult than you think
Hahn, RG
Anesthesia and Analgesia, 105(2): 304-305.
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Chest
Goal-directed Intraoperative therapy reduces morbidity and length of hospital stay in high-risk surgical patients
Donati, A; Loggi, S; Preiser, JC; Orsetti, G; Munch, C; Gabbanelli, V; Pelaia, P; Pietropaoli, P
Chest, 132(6): 1817-1824.
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Anesthesia and Analgesia
The ability of a novel algorithm for automatic estimation of the respiratory variations, in arterial pulse pressure to monitor fluid responsiveness in the operating room
Cannesson, M; Slieker, J; Desebbe, O; Bauer, C; Chiari, P; Henaine, R; Lehot, JJ
Anesthesia and Analgesia, 106(4): 1195-1200.
10.1213/01.ane.0000297291.01615.5c
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Critical Care
Hemodynamic monitoring over the past 10 years
Pinsky, MR
Critical Care, 10(1): -.
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Critical Care
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Acta Anaesthesiologica Scandinavica
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A prospective randomized blinded study of the effect of intravenous fluid therapy on postoperative nausea and vomiting in children undergoing strabismus surgery
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Hospital Medicine
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Intraoperative positive fluid balance improves tissue diffusion of ceftizoxime
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Clinical review: Volume of fluid resuscitation and the incidence of acute kidney injury - a systematic review
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Intensive Care Medicine
The impact of early goal-directed fluid management on survival in an experimental model of severe acute pancreatitis
Trepte, CJC; Bachmann, KA; Stork, JH; Friedheim, TJ; Hinsch, A; Goepfert, MS; Mann, O; Izbicki, JR; Goetz, AE; Reuter, DA
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Acta Anaesthesiologica Scandinavica
Optimising stroke volume and oxygen delivery in abdominal aortic surgery: a randomised controlled trial
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Acta Anaesthesiologica Scandinavica, 57(2): 178-188.
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Acta Anaesthesiologica Scandinavica
Haemodynamic optimisation in lower limb arterial surgery: room for improvement?
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Acta Anaesthesiologica Scandinavica, 57(2): 189-198.
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Anesthesiology
Goal-directed Colloid Administration Improves the Microcirculation of Healthy and Perianastomotic Colon
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Anesthesiology, 110(3): 496-504.
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