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Veno–veno–arterial extracorporeal membrane oxygenation treatment in patients with severe acute respiratory distress syndrome and septic shock

In acute respiratory distress syndrome (ARDS) with refractory septic shock, isolated veno–venous (VV) or veno–arterial (VA) extracorporeal membrane oxygenation (ECMO) may lead to differential hypoxia or inadequate tissue perfusion [1]. In this context, MacLaren et al. [2] showed that central ECMO improved the outcomes by guaranteeing systemic oxygenation without differential hypoxia. However, central ECMO has potential limitations due to its invasiveness and the lack of evidence in adult populations. Veno–veno–arterial (VVA) ECMO may offer effective oxygenation and hemodynamic support without differential hypoxia by regulating the return of oxygenated blood to the underperfused coronary and cerebral circulation [35]. Therefore, VVA mode can be an alternative treatment modality for ARDS patients with severe septic shock.

From October 2013 to March 2015, eight patients experienced septic shock with ARDS (seven men and one woman; average age 50.9 ± 5.9 years, range 18–71 years; five pneumonia-associated sepsis and three extra-pulmonary sepsis). The baseline patient characteristics are summarized in Additional file 1.

Before ECMO, the median mean arterial pressure (MAP) was 40 mmHg (interquartile range (IQR) 33–46), the median arterial lactate level was 7.8 mmol/L (IQR 6.3–16.3), and the median left ventricular ejection fraction was 42.5 % (IQR 23.5–50.0). Despite adequate fluid and vasopressor therapy, refractory shock proceeded. The median amount of fluid received was 4.7 l (IQR 4.3–4.9) and the median central venous oxygen saturation was 81.2 % (IQR 76.9–87.5). The median dose of norepinephrine was 0.7 μg/kg/min (IQR 0.6–0.8; also, vasopressin was used in all patients and six of the eight patients were also treated with epinephrine). All of the patients met the criteria for severe ARDS with a median PaO2/FiO2 of 57 (IQR 51.3–76.2; Table 1). The Institutional Review Board of Pusan National University Yangsan Hospital approved this study and waived the need for informed consent.

Table 1 Hemodynamics and arterial blood gas parameters before ECMO

After VVA ECMO support, MAP increased, while the vasopressor dose and lactate level decreased and adequate oxygenation was sustained (Table 2). The median duration of vasopressor therapy was 24 h (IQR 18–72) and the median duration of VVA ECMO was 3.0 days (IQR 2.0–4.5). After 3 days, all patients had fully recovered from the refractory shock and they did not develop differential hypoxia. In addition, all patients were successfully weaned from arterial support and vasopressor. The overall survival rate was 50.0 %, and the successful weaning rate was 62.5 %. The number of patients is not enough to evaluate the feasibility, but VVA ECMO might be an alternative bridging strategy to assist the heart and lungs in patients with combined cardiopulmonary failure.

Table 2 Hemodynamic changes during VVA ECMO support

Abbreviations

ARDS:

Acute respiratory distress syndrome

ECMO:

Extracorporeal membrane oxygenation

IQR:

Interquartile range

MAP:

Mean arterial pressure

VA:

Veno–arterial

VV:

Veno–venous

VVA:

Veno–veno–arterial

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Correspondence to Dohyung Kim.

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The authors declare that they have no competing interests.

Authors’ contributions

HJY carried out the acquisition of data, data review and manuscript preparation. WHC and DJ participated in the evaluation of ethical issues and performed data review. DK and YSK participated in the conception and coordination of the study and helped to draft the manuscript. All authors read and approved the final manuscript.

Additional file

Additional file 1:

Baseline patient characteristics. F female, M male. (DOCX 15 kb)

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Yeo, H.J., Jeon, D., Kim, Y.S. et al. Veno–veno–arterial extracorporeal membrane oxygenation treatment in patients with severe acute respiratory distress syndrome and septic shock. Crit Care 20, 28 (2015). https://doi.org/10.1186/s13054-016-1205-9

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Keywords

  • Septic Shock
  • Mean Arterial Pressure
  • Acute Respiratory Distress Syndrome
  • Extracorporeal Membrane Oxygenation
  • Acute Respiratory Distress Syndrome Patient