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Anesthesiology:
Clinical Investigations

Difference in Risk Factors for Postoperative Nausea and Vomiting

Stadler, Michaela M.D., M.Sc.*; Bardiau, Françoise R.N., Ph.D.†; Seidel, Laurence M.Sc.‡; Albert, Adelin Ph.D.§; Boogaerts, Jean G. M.D., Ph.D.∥

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Abstract

Background: It is commonly stated that risk factors for postoperative nausea are the same as for vomiting. The authors designed a prospective study to identify and differentiate the risk factors for postoperative nausea and vomiting in various surgical populations in a clinical audit setting.
Methods: The study included 671 consecutive surgical inpatients, aged 15 yr or more, undergoing various procedures. The study focused on postoperative nausea visual analog scale scores every 4 h and vomiting episodes within 72 h. Both vomiting and retching were considered as emetic events. Patient-, anesthesia-, and surgery-related variables that were considered to have a possible effect on the proportion of patients experiencing postoperative nausea and/or vomiting were examined. The bivariate Dale model for binary correlated outcomes was used to identify selectively the potential risk factors of postoperative nausea and vomiting.
Results: Among the 671 patients in the study, 126 (19%) reported one or more episodes of nausea, and 66 patients (10%) suffered one or more emetic episodes during the studied period. There was a highly significant association between the two outcomes. Some risk factors were predictive of both nausea and vomiting (female gender, nonsmoking status, and general anesthesia). History of migraine and type of surgery were mainly responsible for nausea but not for vomiting. The predictive effect of risk factors was controlled for postoperative pain and analgesic drugs.
Conclusion: This study shows that differences exist in risk factors of postoperative nausea and vomiting. These could be explained by differences in the physiopathology of the two symptoms.
POSTOPERATIVE nausea and vomiting—usually summarized as PONV—remains one of the most common and distressing complications after surgery. Several studies have outlined the factors related to an increased incidence of PONV with the aim to target specific patients who might need effective antiemetic prophylaxis. 1–13 It is assumed that PONV has a multifactorial origin, such as patient-related factors (e.g., female gender, history of motion sickness, or PONV), anesthetic factors (e.g., mask ventilation, volatile anesthetics, opioids), and surgical factors. 1–3
It is commonly assumed that risk factors for postoperative nausea are virtually the same as those for vomiting. 6,8 However, review of the literature on individual factors contributing to PONV is often complicated by the lack of standardization in the definitions of “nausea,” “retching,” and “vomiting.” The interchangeable use of the terms nausea and vomiting has led to much confusion because the symptoms do not always accompany each other in severity. In some studies, analysis of PONV is restricted to vomiting, whereas in others, nausea, vomiting, and retching are recorded together. The score constructed by Apfel et al.11,12 only dealt with vomiting and did not try to predict nausea. These inconsistencies have limited the significance of interstudy analyses. Recently, Tramèr 14 proposed that nausea and vomiting should be reported and analyzed separately, considered as “two biologically different phenomena.” This is not an easy task since the two complications often occur together and are therefore highly correlated.
The present epidemiologic study was designed to discern risk factors of PONV with a clear distinction between the two events. Nausea and vomiting were recorded as two different end points, using a quantitative analysis. The survey was performed in a clinical audit setting.
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Materials and Methods

A standardized follow-up survey of PONV incidence was performed over a 3-month period, including all surgical inpatients older than 15 yr who were able to read and understand French and were undergoing various elective surgical procedures: orthopedics, neurosurgery, vascular–thoracic, ophthalmology, maxillofacial, gynecology, urology, plastic, abdominal, stomatology, and ear, nose, and throat (ENT). Thus, a representative sample of everyday surgery was achieved. Patients were excluded if they were unable to understand or realize a visual analog scale (VAS) test, were transferred directly to an intensive care unit, were undergoing an emergency procedure, had preexisting nausea or vomiting, or had received drugs with antiemetic properties 4 h before surgery. Prior to the start of the study, local Ethics Committee (Charleroi, Belgium) approval was obtained, and written informed consent was given by all patients.
Inclusion was prospective and consecutive. At the time of the preoperative visit, a case report form was filled out for each patient by the attending anesthesiologist. It contained characteristics assumed to be predictive for PONV (see Materials and Methods section, fourth paragraph). Patients were familiarized with a 10-cm VAS device for pain (0 = no pain; 10 = worst imaginable pain) and nausea (0 = no nausea at all, 10 = worst imaginable nausea) assessment. 15 No special instructions were given to the attending anesthesiologist regarding anesthesia and postoperative analgesia regimens. Details of anesthesia and surgery, as well as all postoperative events, were recorded on the same case report form that followed the patient during the survey.
Upon arrival in the postanesthesia care unit, patients were asked by the nurse to rate their nausea experience on the VAS device. This process was repeated every 2 h for the first 4 h and was continued every 4 h within 72 h on the surgical ward. The VAS score measured nausea intensity at the time of assessment. Nausea was not assessed while the patient was asleep. Vomiting was recorded as either present or absent by direct observation, by spontaneous complaint at the time of face-to-face interview with the patient every 4 h. The times and number of vomiting and retching episodes were recorded. Both vomiting and retching were considered as emetic events. 4 Data concerning nausea and vomiting were registered on the patient's case report form. The intensity of pain was also evaluated at the same time as nausea using a VAS. All drugs given for pain relief were documented. Patient records, nurses’ notes, and medication sheets were reviewed in detail by the study investigators to ensure completeness of the information.
Factors considered to have a possible effect on the risk of experiencing PONV (nausea and/or vomiting) included age, female gender, body mass index (BMI), nonsmoking status, history of migraine, motion sickness and PONV, type of anesthesia (general or locoregional), and type and duration of surgery (> 100 min or not). 16 Postoperative pain and analgesic consumption (morphine, paracetamol, and nonsteroidal antiinflammatory drugs) were also used to control for postoperative status and treatment of the patients. In the subsequent study, nausea and vomiting were considered as the two outcomes of interest.
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Statistical Analysis
Results were expressed as mean ± SD for quantitative variables and as proportions for categorical factors. Postoperative incidence rates of nausea and vomiting were estimated from the data. Time-related pain VAS measurements were summarized by various parameters as described elsewhere: AUC = area under the VAS–time curve (cm × h); mean VAS (cm); VASmax = peak of VAS (cm); Tmax = time of VASmax (h); and PVAS > 3 = the persistence of pain VAS over 3 cm, i.e., the time period during which pain VAS was above the critical threshold (h). 17,18 The bivariate Dale model was used to identify risk factors specifically associated with nausea, vomiting, or both complications. 19 This method models the joint probability of the two binary outcomes, P(nausea, vomiting), where nausea and vomiting are coded 0 for absent and 1 for present, and accounts for the association between them, in contrast to classic approaches, which simply consist of considering the two outcomes as independent and applying logistic regression to each of them separately. In addition, the Dale model has an attractive property in the sense that the marginal probabilities, P(nausea) and P(vomiting), can be expressed as logistic functions and the effects of the covariates can be interpreted in terms of odds ratios (OR). In the Dale model, one has to estimate (1) the regression coefficients of the covariates for nausea, (2) the regression coefficients of the covariates for vomiting, and (3) the association parameter between nausea and vomiting. It is also possible to test whether the association is dependent on the covariates. The estimation of the unknown parameters of the Dale model and of their SEs is carried out by the maximum likelihood method. It is therefore possible to assess the significance of each covariate's effect and of the association by a classic normal test (parameter estimate divided by SE). The simplest Dale model is the so-called tetrachoric model (no covariate included), which is fitted to the 2 × 2 table obtained by cross-classifying patients according to nausea and vomiting. In turn, the most complicated model incorporates all covariates for both outcomes. Statistical calculations were carried out by means of the SAS package (SAS Institute, Cary, NC; version 8 for Windows), always using all data available. Results were considered to be significant at the 5% critical level (P < 0.05).
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Results

A sample of 671 surgical patients with complete case report forms was included in the study. The distribution of patients according to type of surgery was as follows: orthopedics (141), neurosurgery (54), vascular (32), ophthalmology (8), maxillofacial (41), gynecology (69), urology (58), plastic (32), abdominal (184), stomatology (23), and ENT (29).
Table 1
Table 1
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The patients preoperative characteristics are summarized in table 1. There were 317 (47%) women and 354 (53%) men with a mean age of 47.7 ± 17.4 yr. The proportion of nonsmokers was amounted to 63%. More than 25% of the patients had a history of PONV, motion sickness, or migraine. Eighty patients (12%) had an American Society of Anesthesiologists physical status of III or IV, whereas 102 patients (15%) experienced their first surgery. Premedication was administered to 653 (97%) of the patients. The majority of them received midazolam (92%) and atropine (74%).
Table 2
Table 2
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Among the patients, 480 (72%) received general anesthesia, and 191 (28%) received locoregional anesthesia. The drugs used for general anesthesia are detailed in table 2. The induction of general anesthesia was performed in 89% of the patients with propofol. Anesthesia was maintained with a combination of nitrous oxide, isoflurane, and sufentanil in 316 patients (66%); the others received continuous administration of propofol and sufentanil (34%). Neuromuscular blocking agents, including atracurium or rocuronium, were administered in 385 (80%) of the patients. Pharmacologic reversal of neuromuscular blocking agents was administered in 19 patients (4%) using neostigmine methylsulfate at a mean dose of 1.5 mg associated with glycopyrrolate (mean dose, 0.4 mg) or atropine (mean dose, 0.3 mg). The mean dose of sufentanil used was 23.3 ± 53.9 μg. Opioids were antagonized in six patients (1.2%) using naloxone. Duration of anesthesia (general and locoregional) was 100 ± 66 min.
During the 72 postoperative hours (table 2), paracetamol was given to all patients with a mean dose of 9.7 ± 6.2 g. Nonsteroidal antiinflammatory drugs were used in 429 patients (64%), and morphine was administered in 324 patients (48%) at a mean dose of 11.4 ± 23.1 mg. Patient-controlled analgesia was prescribed in 20 patients (1.5%) during the study period. Postoperatively, pain VAS characteristics were the following: AUC (59 ± 69 cm × h), mean VAS (1.0 ± 1.1 cm), VASmax (3.9 ± 2.5 cm), the time of maximal VAS, Tmax (8.2 ± 13 h), and PVAS > 3 (6.1 ± 11.2 h).
Table 3
Table 3
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The distribution of patients according to postoperative nausea and vomiting is given in table 3. The overall incidence of nausea was 19%, and that of vomiting was 10%. Nausea alone occurred in 73 (11%) patients, vomiting alone occurred in 13 (2%) patients, 53 (8%) patients suffered from both nausea and vomiting, while 532 (79%) were free from the complications. There was a strong association between the two outcomes. Among the 126 patients with nausea, 53 (42%) experienced vomiting. Conversely, among the 66 patients with vomiting, 53 (80%) had nausea. Postoperative nausea scores, expressed as area under the nausea–VAS time curve (AUC) was 2.9 ± 11.4 cm × h, mean VAS 0.32 ± 0.83 cm and VASmax 0.7 ± 1.8 cm. The time of the peak of VAS (Tmax) occurred at 2.4 ± 8.1 h postoperatively. Mean time of vomiting episodes was estimated at 10.1 ± 11.4 postoperative hours. By fitting the tetrachoric model (Dale model with no covariates), the parameters were highly significant (estimates ± SE): 1.43 ± 0.12 for nausea, 2.09 ± 0.15 for vomiting, and 3.55 ± 0.40 for the association, respectively (P < 0.0001). Thus, by taking the exponential of the association coefficient (3.55), the odds of vomiting for patients with nausea were about 35 times the odds of vomiting for patients without nausea, and vice versa, emphasizing the strong association between the two outcomes.
Table 4
Table 4
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In table 4, a detailed distribution of postoperative nausea and/or vomiting is given according to type of surgery. A clear relationship can be seen between the two outcomes and type of surgery. Patients undergoing gynecologic (32%), abdominal (26%), maxillofacial (27%), plastic (25%), neurosurgical (24%) and urological (19%) surgical procedures had the highest incidences of PONV.
Table 5
Table 5
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To identify among preoperative and perioperative risk factors those predictive of postoperative nausea and vomiting, we fitted the bivariate Dale model to the data set by including all covariates, namely, gender, age, BMI, nonsmoking status, history of migraine and of PONV, type of anesthesia, and duration and type of surgery (using ENT as the reference group). To control for postoperative factors, VAS pain parameters (AUC, mean VAS, VASmax, Tmax, and PVAS > 3) and analgesic drugs (morphine, paracetamol, and nonsteroidal antiinflammatory drugs) were also included in the Dale model. Patients with vascular surgery were excluded from the analysis because of a singularity in the maximum likelihood estimation process; this was explained by the fact that only one vascular patient experienced vomiting alone as seen in table 4. Results are displayed in table 5, which gives for each covariate and each outcome the estimated regression coefficient with its SE and corresponding P value. Positive coefficients are associated with an increased risk of developing the complication (OR > 1). Conversely, negative coefficients correspond to a protective effect against the complication (OR < 1).
It is seen that female gender, nonsmoking status, and general anesthesia are significantly related to both nausea and vomiting. Specifically, women are at greater risk of nausea (OR = 2.69; 1.38–5.24) and of vomiting (OR = 3.78; 1.51–9.50) than men. The same argument applies for nonsmokers who are more likely to develop the complications than smokers: nausea (OR = 2.41; 1.26–4.60) and vomiting (OR = 3.0; 1.35–6.71). Patients undergoing general anesthesia have an increased risk of nausea (OR = 2.51; 1.10–5.72) and of vomiting (OR = 3.67; 1.25–10.8) when compared to patients undergoing locoregional anesthesia. Among anesthesia-related factors, maintenance of anesthesia with propofol did not alter the risk for nausea and/or vomiting (P = 0.61). Patients who had nausea or vomiting received a similar amount of sufentanil throughout the perioperative period as patients without these symptoms (P = 0.74).
History of migraine was almost significantly related to nausea (P = 0.052) but not to vomiting (P = 0.63). Duration of surgery was unrelated to outcomes. Overall, however, the type of surgery was significantly associated with nausea but not with vomiting, except for urological procedures (P = 0.037). As seen in table 5, patients undergoing gynecological (P = 0.0082), urological (P = 0.022), abdominal (P = 0.028), and, to a lesser extent, neurologic (P = 0.074), ophthalmologic (P = 0.074), or maxillofacial (P = 0.066) surgery had an increased risk of developing nausea but not vomiting when compared to ENT patients.
It should be noted that postoperative morphine doses were slightly more significantly associated with vomiting (OR = 1.02;P = 0.029) than with nausea (OR = 1.01;P = 0.05), while pain parameters were not significant. More importantly, in the full Dale model, the association parameter between nausea and vomiting was still highly significant (3.74 ± 0.54;P < 0.0001) but was unrelated to the covariates. Thus, even when accounting for covariates, the two outcomes remained strongly dependent on each other (i.e., they most often did and did not occur together).
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Discussion

Although risk factors for postoperative nausea are generally assumed as being the same as those for vomiting, the present study made a clear distinction between the two events, considered as two different end points. 3,6,8,11 Indeed, we found that some risk factors were predictive of both nausea and vomiting (female gender, nonsmoking status, general anesthesia) but that history of migraine and type of surgery, with the exception of urology, were solely related to nausea. There was a clear relationship between nausea and vomiting. In the present study, the overall incidence rate for nausea amounted to 19%, and that for vomiting amounted to 10%. Approximately half of the patients with nausea suffered also from vomiting. This is in accordance with the survey performed by Koivuranta et al.8
The importance of female gender is well estab-lished and appears as the most important predictor of PONV. 3–6,9–12,20 In our survey, nonsmoking status increased both the incidence of nausea and vomiting, as already demonstrated by others. 6,8,11,13,21,22 History of migraine majored nausea without any influence on vomiting. 8
Our study pointed out that BMI and history of PONV or motion sickness had no predictive value for the occurrence of nausea and vomiting when accounting for the other factors. Although some authors have suggested that incidence of PONV is increased in obese patients, we were not able to identify a high BMI as a risk factor in the bivariate Dale model. 1,2,6 Muir et al., 23 Apfel et al., 11,12,24 and more recently Kranke et al.25 in a systematic review did not find a relationship between BMI and the incidence of PONV, either.
Among perioperative related factors, general anesthesia influenced the probability of nausea and vomiting, but there was no direct association between the duration of anesthesia and the incidence of PONV, as demonstrated by Sinclair et al.13 Administration of propofol for anesthesia induction and/or maintenance did not reduce the risk for early nausea or delayed vomiting in our surgical population. This is in accordance with the results of a meta-analysis performed by Tramèr et al., 26,27 who found that intravenous induction of anesthesia with propofol has no relevant effect on PONV. Only when propofol was used for induction and maintenance of anesthesia did the risk for early PONV seem to be smaller, as demonstrated by Tramèr et al.27 and Ericksson and Kortilla. 28 Results of our study are unable to support this statement.
In the present study, patients without and with nausea or vomiting received a similar amount of sufentanil throughout the operative procedure. The role of opioids in PONV is unclear. 29 Review of the literature on anesthetic factors contributing to PONV is difficult because of a lack of standardization. The incidence of PONV after administration of various anesthetic agents reported by different authors cannot be compared since each group of authors used different criteria and different population groups. Recently, Apfel et al.30 in a randomized control trial found that volatile anesthetics were the leading cause of early postoperative vomiting. Nevertheless, this study included 46% of children and focused only on patients after specific surgical procedures, i.e., ENT and ophthalmology, known to maximize the incidence of PONV. No relationships could be established with our results.
It is commonly stated that the type of surgery influences the risk of PONV. 1–3,6 Our data reflected a casual impact of surgical procedures on nausea alone, notably gynecology, and abdominal surgery with the exception of urology that increased both nausea and vomiting. These results are in contradiction with the papers from Apfel et al.16,24 and other authors 8,22,31 who found that the type of surgery did not seem to play a major role in the incidence of PONV. Studies published to date have used a variety of methodologies that do not permit meaningful conclusions to be drawn. To our knowledge, this is the first that accounts for the high association between the two outcomes. In that respect, the bivariate Dale model is an interesting alternative to classic approaches, which apply logistic regression to each outcome separately and hence ignore the dependence structure of nausea and vomiting.
Our data showed that the dose of administered morphine significantly increased the incidence of nausea and vomiting. The outstanding importance of morphine use, not considered as a predictive factor, is in line with results of previous studies. 1,32 Postoperative pain did not influence nausea and vomiting. Nevertheless, our patients benefited from formal acute pain management in the form of an acute pain service. 17
The difference in risk factors for postoperative nausea and vomiting could be explained by the difference in the physiology of the two events. 32–34 Nausea is a subjective sensation requiring activation of neural pathways, which eventually project to areas of the cerebral hemispheres dealing with conscious sensations. 34 Nausea is not always followed by retching or vomiting. Vomiting is a complex reflex under the control of two functionally distinct medullar centers: the vomiting center in the dorsal portion of the lateral reticular formation and the chemoreceptor trigger zone in the area postrema of the floor of the fourth ventricle. Furthermore, it is well proved that an antiemetic drug may have more antinausea efficacy, i.e., droperidol, or more antiemetic efficacy, i.e., the 5-HT3 antagonists. 14
As recently stated by Tramèr, 14,35 “more precise quantification of PONV incidence will come from studies where nausea and vomiting are separate endpoints, and the cumulative incidence of nausea and vomiting is reported at different time points.” The methodological issue used in this survey considered these recommendations. In the present prospective investigation, we studied a fairly large number of surgical inpatients. Nausea and vomiting episodes have been dissected every 4 h during a long observation period, namely 72 postoperative hours. Our study gave detailed information on the time course of postoperative nausea and vomiting. Nausea was more frequently encountered in the postanesthesia care unit, but vomiting episodes appeared later, around the 12th postoperative hour. Motion, including transportation on a stretcher during the recovery phase, can precipitate nausea. 36 Furthermore, nausea intensity was assessed using a VAS device as a secondary end point. 15 These measurements are in accordance with the studies conducted by Cohen et al.6 and Koivuranta et al.8
To confirm the results of the present study, larger-scale trials using a similar methodological approach should be carried out, not only in other centers but also on other surgical patient populations, e.g., in day-case surgery.
In conclusion, female gender, nonsmoking status, and general anesthesia increase both postoperative nausea and vomiting. History of migraine and a variety of surgeries (gynecological, abdominal, neurologic, ophthalmology, and maxillofacial) do or tend to influence nausea only. The clinical implication is important for prophylaxis and treatment of the two symptoms and could influence how future work in this area is done.
The authors thank Professor Geert Molenberghs, Ph.D. (Department of Biostatistics, Limburgs Universitair Centrum, Diepenbeek, Belgium), for helpful discussions and advice on the Dale model.
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Tobacco control for anesthesiologists
Warner, DO
Journal of Anesthesia, 21(2): 200-211.
10.1007/s00540-006-0483-9
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Anaesthesia
Association between nitrous oxide and the incidence of postoperative nausea and vomiting in adults: a systematic review and meta-analysis
Fernandez-Guisasola, J; Gomez-Arnau, JI; Cabrera, Y; del Valle, SG
Anaesthesia, 65(4): 379-387.
10.1111/j.1365-2044.2010.06249.x
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Obesity Surgery
Intra-operative fluid volume influences postoperative nausea and vomiting after laparoscopic gastric bypass surgery
Schuster, R; Alami, RS; Curet, MJ; Paulraj, N; Morton, JM; Brodsky, JB; Brock-Utne, JG; Lemmens, HJM
Obesity Surgery, 16(7): 848-851.

Hepato-Gastroenterology
Helicobacter pylori infection and postoperative nausea and vomiting
Notash, AY; Notash, AY; Amoli, HA; Konari, AY; Daemi, M; Alizadeh, K; Habibi, G
Hepato-Gastroenterology, 55(): 883-886.

British Journal of Anaesthesia
Risk factors for severe postoperative nausea and vomiting in a randomized trial of nitrous oxide-based vs nitrous oxide-free anaesthesia
Leslie, K; Myles, PS; Chan, MTV; Paech, MJ; Peyton, P; Forbes, A; McKenzie, D
British Journal of Anaesthesia, 101(4): 498-505.
10.1093/bja/aen230
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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
A survey of orthopedic surgeons' attitudes and knowledge regarding regional anesthesia
Oldman, M; McCartney, CJL; Leung, A; Rawson, R; Perlas, A; Gadsden, J; Chan, VWS
Anesthesia and Analgesia, 98(5): 1486-1490.
10.1213/01.ANE.0000113549.98873.B1
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American Journal of Health-System Pharmacy
Prevention and treatment of postoperative nausea and vomiting
Golembiewski, J; Chernin, E; Chopra, T
American Journal of Health-System Pharmacy, 62(): 1247-1260.

Journal of Pain and Symptom Management
Migraine as a Cause of Persistent Nausea or Vomiting in Palliative Care: A Case Series
Hirst, B; Noble, B
Journal of Pain and Symptom Management, 37(5): 918-922.
10.1016/j.jpainsymman.2008.05.012
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Aviation Space and Environmental Medicine
Effects of ethnicity and gender on motion sickness susceptibility
Klosterhalfen, S; Kellermann, S; Pan, F; Stockhorst, U; Hall, G; Enck, P
Aviation Space and Environmental Medicine, 76(): 1051-1057.

Acta Anaesthesiologica Scandinavica
Comparison of different concentrations of levobupivacaine for post-operative epidural analgesia
Dernedde, M; Stadler, M; Bardiau, F; Boogaerts, J
Acta Anaesthesiologica Scandinavica, 47(7): 884-890.

Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie
Evidence-based management of postoperative nausea and vomiting: a review
Habib, AS; Gan, TJ
Canadian Journal of Anaesthesia-Journal Canadien D Anesthesie, 51(4): 326-341.

Headache
Triggers of motion sickness in migraine sufferers
Drummond, PD
Headache, 45(6): 653-656.

Journal of Clinical Anesthesia
The impact of isoflurane, desflurane, or sevoflurane on the frequency and severity of postoperative nausea and vomiting after lumbar disc surgery
Wallenborn, J; Rudolph, C; Gelbrich, G; Goerlich, TM; Helm, J; Olthoff, D
Journal of Clinical Anesthesia, 19(3): 180-185.
10.1016/j.jclinane.2006.09.004
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Journal of International Medical Research
Efficacy of prophylactic ondansetron in a patient-controlled analgesia environment
Han, SH; Lim, YJ; Ro, YJ; Lee, SC; Park, YS; Kim, YC
Journal of International Medical Research, 32(2): 160-165.

Anasthesiologie Intensivmedizin Notfallmedizin Schmerztherapie
Pathophysiology, risk factors and risk evaluation for nausea and vomiting in the postoperative phase
Apfel, CC
Anasthesiologie Intensivmedizin Notfallmedizin Schmerztherapie, 40(8): 497-503.
10.1055/s-2005-861339
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Current Medical Research and Opinion
Preventing postoperative nausea and vomiting: post hoc analysis of pooled data from two randomized active-controlled trials of aprepitant
Diernunsch, P; Apfel, C; Gan, TJ; Candiotti, K; Philip, BK; Chelly, J; Carides, AD; Evans, JK; Ho, TW; Reiss, T
Current Medical Research and Opinion, 23(): 2559-2565.
10.1185/030079907X233115
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Anesthesia and Analgesia
CON: Postoperative Nausea and Vomiting Database Research: Limitations and Opportunities
Habib, AS; Gan, TJ
Anesthesia and Analgesia, 110(2): 412-414.
10.1213/ANE.0b013e3181bd1bce
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Anaesthesia and Intensive Care
Choice of anaesthetic maintenance technique in adult surgical patients
Leslie, K; Keane, E
Anaesthesia and Intensive Care, 32(6): 845.

Saudi Medical Journal
Prophylaxis of postoperative nausea and vomiting with ondansetron, metoclopramide, or placebo in total intravenous anesthesia patients undergoing laparoscopic cholecystectomy
Kaki, AM; El-Hakeen, EEA
Saudi Medical Journal, 29(): 1408-1413.

Anesthesia and Analgesia
Recent smoking behavior and postoperative nausea and vomiting
Whalen, F; Sprung, J; Burkle, CM; Schroeder, DR; Warner, DO
Anesthesia and Analgesia, 103(1): 70-75.
10.1213/01.ane.0000221435.14002.4c
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Surgical Endoscopy and Other Interventional Techniques
Ramosetron versus ondansetron for the prevention of postoperative nausea and vomiting after laparoscopic cholecystectomy
Ryu, J; So, YM; Hwang, J; Do, SH
Surgical Endoscopy and Other Interventional Techniques, 24(4): 812-817.
10.1007/s00464-009-0670-5
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Annals of Pharmacotherapy
Prevention of postoperative nausea and vomiting
Wilhelm, SM; Dehoorne-Smith, ML; Kale-Pradhan, PB
Annals of Pharmacotherapy, 41(1): 68-78.
10.1345/aph.1H398
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Acta Anaesthesiologica Scandinavica
Post-operative recovery profile after laparoscopic cholecystectomy: a prospective, observational study of a multimodal anaesthetic regime
Jensen, K; Kehlet, H; Lund, CM
Acta Anaesthesiologica Scandinavica, 51(4): 464-471.
10.1111/j.1399-6576.2006.01251.x
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Anesthesia and Analgesia
PRO: Anatomical Classification of Surgical Procedures Improves Our Understanding of the Mechanisms of Postoperative Nausea and Vomiting
Scuderi, PE
Anesthesia and Analgesia, 110(2): 410-411.
10.1213/ANE.0b013e3181c5bcfc
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Pain Medicine
Cognitive-Affective and Somatic Side Effects of Morphine and Pentazocine: Side-Effect Profiles in Healthy Adults
Riley, JL; Hastie, BA; Glover, TL; Fillingim, RB; Staud, R; Campbell, CM
Pain Medicine, 11(2): 195-206.

British Journal of Anaesthesia
Droperidol has comparable clinical efficacy against both nausea and vomiting
Apfel, CC; Cakmakkaya, OS; Frings, G; Kranke, P; Malhotra, A; Stader, A; Turan, A; Biedler, A; Kolodzie, K
British Journal of Anaesthesia, 103(3): 359-363.
10.1093/bja/aep177
CrossRef
Annals of Oncology
The strength of female sex as a prognostic factor in small-cell lung cancer: a pooled analysis of chemotherapy trials from the Manchester Lung Group and Medical Research Council Clinical Trials Unit
Wheatley-Price, P; Ma, C; Ashcroft, LF; Nankivell, M; Stephens, RJ; White, SC; Lorigan, P; Thatcher, N; Blackhall, FH; Shepherd, FA
Annals of Oncology, 21(2): 232-237.
10.1093/annonc/mdp300
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Presse Medicale
Rehabilitation after abdominal surgery
Bonnet, F; Szymkiewicz, O; Marret, E; Houry, S
Presse Medicale, 35(6): 1016-1022.

Anaesthesia
Does the efficacy of supplemental oxygen for the prevention of postoperative nausea and vomiting depend on the measured outcome, observational period or site of surgery?
Turan, A; Apfel, CC; Kumpch, M; Danzeisen, O; Eberhart, LHJ; Forst, H; Heringhaus, C; Isselhorst, C; Trenkler, S; Trick, M; Vedder, I; Kerger, H
Anaesthesia, 61(7): 628-633.
10.1111/j.1365-2044.2006.04703.x
CrossRef
Anasthesiologie Intensivmedizin Notfallmedizin Schmerztherapie
Pharmacotherapy: Migraines and depression - Perioperative treatment with Sumatriptan and citalopram: Assessment from an anaesthesiological viewpoint
Ittner, KP
Anasthesiologie Intensivmedizin Notfallmedizin Schmerztherapie, 41(): 464-465.

Anasthesiologie Intensivmedizin Notfallmedizin Schmerztherapie
Metoclopramide and dexamethasone in prevention of postoperative nausea and vomiting after inhalational anaesthesia
Wallenborn, J; Rudolph, C; Gelbrich, G; Goerlich, TM; Dohnert, J; Dorner, J; Olthoff, D
Anasthesiologie Intensivmedizin Notfallmedizin Schmerztherapie, 38(): 695-704.

Annales Francaises D Anesthesie Et De Reanimation
Prevention and treatment of postoperative nausea and vomiting in children. An evidence-based approach
Tramer, MR
Annales Francaises D Anesthesie Et De Reanimation, 26(6): 529-534.
10.1016/j.annfar.2007.03.019
CrossRef
Minerva Anestesiologica
Magnetic acupressure for management of postoperative nausea and vomiting: a preliminary study
Klaiman, P; Sternfeld, M; Deeb, Z; Roth, Y; Golan, A; Ezri, T; Azamfirei, L
Minerva Anestesiologica, 74(): 635-642.

Anaesthesia
Ondansetron has similar clinical efficacy against both nausea and vomiting
Jokela, RM; Cakmakkaya, OS; Danzeisen, O; Korttila, KT; Kranke, P; Malhotra, A; Paura, A; Radke, OC; Sessler, DI; Soikkeli, A; Roewer, N; Apfel, CC
Anaesthesia, 64(2): 147-151.
10.1111/j.1365-2044.2008.05732.x
CrossRef
Anesthesia and Analgesia
Society for ambulatory anesthesia guidelines for the management of postoperative nausea and vomiting
Gan, TJ; Meyer, TA; Apfel, CC; Chung, F; Davis, PJ; Habib, AS; Hooper, VD; Kovac, AL; Kranke, P; Myles, P; Philip, BK; Samsa, G; Sessler, DI; Temo, J; Tramer, MR; Kolk, CV; Watcha, M
Anesthesia and Analgesia, 105(6): 1615-1628.

British Medical Journal
Treatment of postoperative nausea and vomiting. Better data, improved control have been achieved during recent years
Tramer, MR
British Medical Journal, 327(): 762-763.

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
CrossRef
British Journal of Anaesthesia
Incidence of postoperative nausea and emetic episodes after xenon anaesthesia compared with propofol-based anaesthesia
Coburn, M; Kunitz, O; Apfel, CC; Hein, M; Fries, M; Rossaint, R
British Journal of Anaesthesia, 100(6): 787-791.
10.1093/bja/aen077
CrossRef
Anesthesia and Analgesia
Sex-specific responses to opiates: Animal and human studies
Dahan, A; Kest, B; Waxman, AR; Sarton, E
Anesthesia and Analgesia, 107(1): 83-95.
10.1213/ane.0b013e31816a66a4
CrossRef
Anesthesia and Analgesia
The Effect of an Anatomically Classified Procedure on Antiemetic Administration in the Postanesthesia Care Unit
Ruiz, JR; Kee, SS; Frenzel, JC; Ensor, JE; Selvan, M; Riedel, BJ; Apfel, C
Anesthesia and Analgesia, 110(2): 403-409.
10.1213/ane.0b013e3181a9d076
CrossRef
Drug and Alcohol Dependence
Psychopharmacological effects of oxycodone in healthy volunteers: Roles of alcohol-drinking status and sex
Zacny, JP; Drum, M
Drug and Alcohol Dependence, 107(): 209-214.
10.1016/j.drugalcdep.2009.10.012
CrossRef
Expert Opinion on Pharmacotherapy
Pharmacotherapy of postoperative nausea and vomiting
Habib, AS; Gan, TJ
Expert Opinion on Pharmacotherapy, 4(4): 457-473.

Journal of Pain
Morphine responses and experimental pain: Sex differences in side effects and cardiovascular responses but not analgesia
Fillingim, RB; Ness, TJ; Glover, TL; Campbell, CM; Hastie, BA; Price, DD; Staud, R
Journal of Pain, 6(2): 116-124.
10.1016/j.jpain.2004.11.005
CrossRef
Anesthesiology
The Role of Smoking History in the Development of Postoperative Nausea and Vomiting
Werner, J; Fernandez, S; Awad, H
Anesthesiology, 109(1): 156-157.
10.1097/ALN.0b013e31817b5afd
PDF (604) | CrossRef
Anesthesiology
Does Multimodal Analgesia with Acetaminophen, Nonsteroidal Antiinflammatory Drugs, or Selective Cyclooxygenase-2 Inhibitors and Patient-controlled Analgesia Morphine Offer Advantages over Morphine Alone?: Meta-analyses of Randomized Trials
Elia, N; Lysakowski, C; Tramèr, MR
Anesthesiology, 103(6): 1296-1304.

PDF (777)
Annals of Plastic Surgery
A Challenging Problem That Concerns the Aesthetic Surgeon: Postoperative Nausea and Vomiting
Eryilmaz, T; Sencan, A; Camgoz, N; Ak, B; Yavuzer, R
Annals of Plastic Surgery, 61(5): 489-491.
10.1097/SAP.0b013e31817e9d08
PDF (204) | CrossRef
The Clinical Journal of Pain
Response to Morphine in Male and Female Patients: Analgesia and Adverse Events
Bijur, PE; Esses, D; Birnbaum, A; Chang, AK; Schechter, C; Gallagher, EJ
The Clinical Journal of Pain, 24(3): 192-198.
10.1097/AJP.0b013e31815d3619
PDF (195) | CrossRef
Current Opinion in Anesthesiology
The role of neurokinin-1 receptor antagonists for the management of postoperative nausea and vomiting
Apfel, CC; Malhotra, A; Leslie, JB
Current Opinion in Anesthesiology, 21(4): 427-432.
10.1097/ACO.0b013e328301831c
PDF (199) | CrossRef
European Journal of Anaesthesiology (EJA)
Risk factors for nausea and vomiting following vitrectomyin adults
Nitahara, K; Sugi, Y; Shono, S; Hamada, T; Higa, K
European Journal of Anaesthesiology (EJA), 24(2): 166-170.
10.1017/S0265021506001360
PDF (62) | CrossRef
Journal of Neurosurgical Anesthesiology
Assessing Risk Factors for Postoperative Nausea and Vomiting: A Retrospective Study in Patients Undergoing Retromastoid Craniectomy With Microvascular Decompression of Cranial Nerves
Meng, L; Quinlan, JJ
Journal of Neurosurgical Anesthesiology, 18(4): 235-239.
10.1097/01.ana.0000211019.11302.7a
PDF (90) | CrossRef
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