Summary of Dengue Cases
April 2011, a 32 year old man presented with 4 days of musculoskeletal pain, fever, dry cough, and emesis. He initially required mechanical ventilation for respiratory failure and rapidly deteriorated to severe hypoxemic (PaO2/FiO2: 44). A thorax computed tomography (CT) scan showed diffuse ground-glass opacities and signs of multilobar alveolar occupation. Despite an initial partial recovery, 7 days after hospital admission his respiratory status worsened (Murray score of 3.75), requiring femoro-jugular VV-ECMO. The patient tested positive for dengue IgM, and antiviral treatment was initiated. The patient was successfully decannulated after 34 days of ECMO treatment and discharged after 75 days of hospitalization. Thirty-three months after discharge, the patient remained asymptomatic.
January 2014, a 31 year old pregnant woman (29.9 weeks gestation) suffered from 4 days of fever, asthenia, and progressive respiratory difficulties. The patient was diagnosed with preeclampsia, and preterm delivery was induced. Postpartum, she presented with refractory thrombocytopenia and hypoxemic respiratory failure, requiring invasive mechanical ventilation (IMV). Given the persistent severe hypoxemia and hemodynamic instability, the FCV mobile ECMO team implanted femoro-jugular VV-ECMO. IgM tested positive for dengue. A brain CT scan revealed multiple foci cortical/subcortical bleeding (Figure 1), and anticoagulation was discontinued. The next day, the patient was declared brain dead, and ECMO support was withdrawn. Autopsy confirmed multiple intraparenchymal hemorrhaging associated with microangiopathic thrombosis, brain edema, herniation of cerebellar tonsils, ARDS in proliferative phase, and diffuse alveolar hemorrhaging.
November 2014, an 11 year old obese (body mass index: 29.4, 98th percentile) male was admitted after 5 days of general malaise and persistent fever. The patient progressed to ARDS requiring mechanical ventilation. IgM tested positive for dengue. On day 12 of IMV, the patient presented refractory hypoxemia and hemodynamic instability. The FCV mobile ECMO team initiated femoral-jugular VV-ECMO (Figure 2). The patient was weaned off ECMO on day 15, extubated at day 18, and discharged at day 31. Eight months after discharge, the patient presented with New York Heart Association (NYHA) functional class II. The spirometry showed a mixed pattern, without changes in spite of bronchodilator.
Summary of Malaria Case
February 2013, a 15 year old primigravida was admitted at 26 weeks of gestation, for periodic fever during the previous 6 months. Four days before admission, the patient developed intense fever (>39°C) associated with cold chills, back pain, rash, and asthenia. Pancytopenia was identified and a thick blood smear revealed P. vivax that was treated with chloroquine. On day 5, the patient developed ARDS and hemodynamic instability requiring IMV. Urgent cesarean section was performed at 28 weeks because of refractory hypoxemia. Five days after cesarean section, the patient’s respiratory status worsened (PaO2/FiO2: 46.8). The FCV mobile ECMO team initiated femoral-jugular VV-ECMO. The patient presented multiple organ failure (MOF) with cardiac, hepatic, and renal compromise. Lung biopsy showed edema, bleeding, mononuclear cells infiltration in the interstitial space, and low fibrotic remodeling. After 8 weeks on ECMO, the patient’s condition did not improve, and she was evaluated according to the Lung Transplantation Program but was rejected as a candidate. Subsequently, pulmonary surfactant was used as a rescue treatment. Extracorporeal membrane oxygenation was successfully weaned off at 90 days, and total hospital stay was 134 days. Twenty-nine months after discharge, the patient remains with severe restrictive compromise in spirometry and moderate functional compromise in the 6 minute walk test (508 m).
Summary of Chagas Cases
February 2010, a 24 year old woman from a high-risk zone for Chagas disease was admitted with 20 days of fever, asthenia, headache, dyspnea, and leg edema. Echocardiogram revealed severe pericarditis, pericardial effusion, and signs of imminent tamponade with left ventricular ejection fraction (LVEF) of 60%, requiring pericardial emergency window. Pericardial biopsy showed a moderate lymphocytic pericarditis. The patient became hemodynamic instable requiring resuscitation and inotropic support. Acute chagasic myocarditis was suspected, and empiric antiparasitic management was initiated. Echocardiography reported lower ventricular akinesia, and LVEF less than 10%. The patient developed arrhythmia requiring resuscitation, and femoro-femoral VA-ECMO was started as a bridge to heart transplantation. Two days after, an orthotopic heart transplant was performed. Enzyme-linked immunosorbent assay was positive for T. Cruzi. The diagnosis of severe acute chagasic myocarditis was confirmed by endomyocardial biopsy. The patient was discharged after 150 days. Following 62 months, the patient was asymptomatic with NYHA functional class I and LVEF of 60%.
September 2012, a 46 year old woman was admitted with 20 days of fever, asthenia, dysuria, lumbalgia, emesis, diffuse-nonspecific abdominal pain, dyspnea, and lower limbs edema. General infection diseases were discarded. Echocardiogram revealed LVEF of 55% and pericardial effusion, requiring emergency pericardial window. Enzyme-linked immunosorbent assay was positive for T. Cruzi. Severe acute chagasic myocarditis was confirmed by endomyocardial biopsy, and antiparasitic management with nifurtimox was initiated. Despite antiparasitic treatment, the patient deteriorated to cardiogenic and septic shock with MOF with a LVEF of 20–25% and a poor right ventricular contractility. Therefore, femoro-femoral VA-ECMO was started as a bridge to recovery. The patient remained on ECMO for 8 days. Echocardiogram reported LVEF of 60% with a normal heart size. After 55 days in the intensive care unit, the patient died because of severe sepsis caused by ventilation-associated pneumonia, catheter-related infection, and inguinal area infection.
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With this case report, we demonstrate the additional value of ECMO therapy in the treatment of severe dengue, malaria, and acute Chagas disease. Although these vector-borne diseases are endemic in several continents, literature on ECMO treatment is lacking. This is, to the best of our knowledge, the biggest case report of vector-mediated diseases and ECMO, and the first description of ECMO being implemented in the treatment of acute Chagas disease.
According to the World Health Organization, every year 50–100 million people are infected with the dengue virus, and 198 million people are annually infected with malaria causing approximately 548,000 deaths every year. As for Chagas disease, year by year 7–8 million people are infected.1,6 Aforementioned, these vector-mediated diseases may be complicated by respiratory distress or cardiac failure.2–8,18 Because of significant technical improvements, ECMO is currently globally used as a salvage therapy for patients with refractory hypoxemia and cardiogenic shock who fail to respond to conventional therapy and have an estimated mortality rate over 80%.9–12,20 Unfortunately, the most advanced ECMO devices are expensive, hampering its use in underdeveloped countries.19 Fundación Cardiovascular de Colombia has adapted the ECMO system in two ways: using less expensive cardiopulmonary bypass devices and reducing the workload by simplifying the ECMO care process. This case report demonstrates that these adaptations are successful, given that five (~83%) were successfully weaned off ECMO and four (~66%) were successfully discharged. Furthermore, this demonstrates that ECMO therapy can be beneficial in the treatment of severe vector-borne diseases like dengue, malaria, and Chagas disease.
Still, ECMO remains a high-risk treatment with severe complications, such as bleeding, hemolysis, and infection.10 Extra precautions should be taken in severe dengue patients when treated with ECMO, especially with regard to coagulation parameters. We described two patients, one dengue and one malaria, that were pregnant when admitted to the hospital. During pregnancy, the immunity is modified6; therefore, pregnant women are more vulnerable to develop severe dengue or malaria. Extra caution should be taken to prevent this. In 1993, Neurath et al.13 already reported successful ECMO treatment in a pregnant patient with malaria.
In case 5, ECMO was initiated as a bridge to heart transplantation. At that time, it was not known that patients with acute Chagas disease would recover. Because FCV was able to receive an organ donor within 2 days, it was decided to threat the acute Chagas infection with a heart transplant and immunosuppression simultaneously. Despite this chosen treatment, Chagas reactivated 7 months later, requiring additional antiparasitic treatment. Five years since, there has not been any further Chagas reactivation in the patient. In case 6, ECMO was initiated as a bridge to recovery, showing heart function improvement in the first week of ECMO and antiparasitic treatment. Based on this comparison, for future consideration FCV will try to recover acute Chagas patients within 1–2 weeks before listing them for heart transplantation.
As stated before, ARDS and refractory cardiogenic shock can be caused by vector-mediated diseases, especially in tropical areas. Because ECMO remains a bridging therapy, early disease detection is of imminent importance to start the specific and effective therapy as soon as possible. In four cases, the definite diagnoses were confirmed after ECMO was initiated; thus, the right treatment plan was initiated later than ideally required.
In conclusion, we successfully weaned ~83% off ECMO and ~66% were successfully discharged, using our adapted ECMO system. Extracorporeal membrane oxygenation could be a rescue therapy in severe dengue, malaria, and acute Chagas disease, as a bridge to either recovery or transplantation. However, ECMO remains a high-risk therapy that should only be considered in specialized ECMO centers.
In this study, we retrospectively reported six patients. No hard conclusions can be extracted from these results because of the small number of patients. Furthermore, because five of our patients were primarily admitted to another hospital, a complete medical history was difficult to obtain and therefore some information could be incomplete.
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Keywords:Copyright © 2017 by the American Society for Artificial Internal Organs
extracorporeal membrane oxygenation; acute respiratory distress syndrome; malaria; dengue; Chagas disease