• Chest · Mar 2005

    Does continuous positive airway pressure by face mask improve patients with acute cardiogenic pulmonary edema due to left ventricular diastolic dysfunction?

    • Karim Bendjelid, Nicolas Schütz, Peter M Suter, Gerard Fournier, Didier Jacques, Samir Fareh, and Jacques-A Romand.
    • Surgical Intensive Care Unit, Department of Anesthesiology, Pharmacology and Surgical Intensive Care, Geneva University Hospitals, CH-1211 Genève 14, Switzerland. Karim. Bendjelid@hcuge.ch
    • Chest. 2005 Mar 1;127(3):1053-8.

    ObjectiveContinuous positive airway pressure (CPAP) by face mask is an effective method of treating severe cardiogenic pulmonary edema (CPE). However, to our knowledge, no study has provided a precise evaluation of the effects of CPAP on cardiac function in patients presenting with CPE and preserved left ventricular (LV) function.DesignProspective observational clinical study.SettingA 14-bed, medical ICU at a university hospital.PatientsNine consecutive patients presenting with hypoxemic acute CPE.InterventionsAll patients were selected for 30 min of CPAP with 10 cm H(2)O by mask with fraction of inspired oxygen adjusted for a cutaneous saturation > 90%. Doppler echocardiography was performed before CPAP application and during the last 10 min of breathing with CPAP. Two-tailed, paired t-tests were used to compare data recorded at baseline (oxygen alone) and after CPAP.Measurements And ResultsFour patients presented CPE with preserved left ventricular (LV) function (a preserved LV ejection fraction [LVEF] > 45%, and/or aortic velocity time integral > 17 cm in the absence of aortic stenosis or hypertrophic cardiomyopathy). Oxygenation and ventilatory parameters were improved by CPAP in all patients. Hemodynamic monitoring and Doppler echocardiographic analysis demonstrated that in patients with preserved LV systolic function, mean arterial pressure and LV end-diastolic volume were decreased significantly by CPAP (p < 0.04). In patients with LV systolic dysfunction, CPAP improved LVEF (p < 0.05) and decreased LV end-diastolic volume (p = 0.001) significantly.ConclusionCPAP improves oxygenation and ventilatory parameters in all kinds of CPE. In patients with preserved LV contractility, the hemodynamic benefit of CPAP results from a decrease in LV end-diastolic volume (preload).

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