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Pulmonary edema in pregnancy and the puerperium: a cohort study of 53 cases.

OBJECTIVE: To describe the etiology and obstetric outcome in women presenting with pulmonary edema during pregnancy and the puerperium. As a secondary objective, we evaluated the utility of echocardiography in the investigation and management of such women.

METHODS: Retrospective case note analysis of 53 cases of pulmonary edema that resulted in severe respiratory distress and admission to intensive care. The study population were women accessing obstetric care at a tertiary referral center in South Africa.

RESULTS: Cases were classified as cardiac (6/53; 11%), hypertensive (44/53; 83%), or septic (3/53; 6%), depending on the underlying cause for pulmonary edema. There were significant differences in the mean ejection fraction at echocardiography for cardiac vs. non-cardiac groups (26% vs. 55%, P=0.0001), as well as the presence of valvular stenosis or regurgitation (5/6 vs. 8/30, P=0.016). Women in the non-cardiac group were more likely to present earlier and require earlier delivery than in the cardiac group (median gestation at delivery 35 weeks vs. 38 weeks, P=0.0106) and mothers in the cardiac group were more likely to die (2/6 vs. 1/47, P=0.031). Cesarean delivery was performed in 85% of cases.

CONCLUSIONS: Hypertensive illness is the most common underlying etiology in the development of pulmonary edema. Transthoracic echocardiography is a non-invasive investigation that can be carried out at the bedside and is a useful diagnostic tool in pulmonary edema occurring in pregnancy and the puerperium. Knowledge of ejection fraction is an important diagnostic tool to differentiate the underlying causes and to guide management.

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