Abstract

ZEGARRA, Jaime et al. Morbidity and mortality of patients with acute respiratory distress syndrome/acute pulmonary injury due to influenza A H1N1 who required cardiopulmonary support in a general hospital. Rev Med Hered [online]. 2012, vol.23, n.1, pp.23-29. ISSN 1018-130X.

Objective: To determine the morbidity and mortality patterns of patients with acute respiratory distress syndrome (ARDS)/acute pulmonary injury (API) due to influenza A H1N1 who required cardiopulmonary support in a general hospital. Methods: Retrospective case series. Clinical charts, mechanical ventilation and hemodynamic monitoring charts of patients with ARDS/API due to influenza A H1N1 admitted to the general intensive care unit (GICU) of Hospital Nacional Cayetano Heredia from May to September 2009 were reviewed. The diagnosis of influenza H1N1 was confirmed with RT-PCR. Results: 99 patients with influenza A H1N1 were attended; 9 were admitted in the GICU with ARDS/API; five patients required invasive mechanical ventilation (IMV); three non-invasive mechanical ventilation (NIMV) and one did not require ventilatory support. Mean age was 43.3 ± 18.3 years; mean duration of symptoms was 8 ± 3 days. On admission, 100% of patients had fever and dyspnea; mean APACHE II score was 10.5 ± 4.1 and mean SOFA score was 5.6 ± 3.2; the mean Pa02/Fi02 was 96.74 ± 28.6. In 4/5 of patients requiring IMV the Pa02/Fi02 at 12 hours and at the end of mechanical ventilation was < 200. Estimated pulmonary wedge pressure was 15.69 ± 3.6 and the cardiac index estimated by esophageal doppler ultrasound was 2.4 ± 0.34. AST was 160 ± 152.15, LDH was 2366.33 ± 1862.13 and CK was 216 ± 298.25. All patients received oseltamivir 150 mg every 12 hours per 10 days. Four patients died. Conclusions: Patients with ARDS/API due to influenza A H1N1 were young adults with protracted disease with fever and lymphopenia, without cardiovascular involvement and with refractory hypoxemia as the main cause of death.

Keywords : Influenza A Virus; H1N1 Subtype; acute respiratory distress syndrome; acute lung injury.

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