A recovered ejection fraction after peripartum cardiomyopathy lowers death risk in the next pregnancy but does not prevent relapse

Design

Systematic review and meta-analysis of six cohort studies

Population

266 women with previous peripartum cardiomyopathy in a subsequent pregnancy (174 recovered, 92 not)

Primary outcome

Relapse of peripartum cardiomyopathy

Effect

Relapse RR 0.77 (0.50–1.19); maternal mortality 1.7% vs 10.9%, RR 0.27 (0.09–0.87)

This meta-analysis pooled six cohort studies of 266 women with previous peripartum cardiomyopathy who became pregnant again. It compared 174 whose left ventricular ejection fraction had recovered to 50% or more before the next pregnancy with 92 whose had not.

Relapse was common in both groups and not significantly different (rate ratio 0.77, 95% CI 0.50–1.19; I² = 3%). Maternal mortality was lower after recovery, 1.7% against 10.9% (RR 0.27, 0.09–0.87; I² = 0%). Women who had recovered had a higher ejection fraction during and after the pregnancy and were about twice as likely to recover function again (RR 2.07). Symptom worsening and obstetric and neonatal outcomes did not differ.

The usual counselling has been that recovery makes another pregnancy reasonably safe. That is half right: the risk of dying was much lower, but the heart failed again often enough that no woman with prior peripartum cardiomyopathy should go through pregnancy without a cardiologist involved. For women whose ejection fraction has not recovered, a maternal mortality of about one in ten is the figure to put in front of them.

• Record the most recent ejection fraction before any conversation about another pregnancy
• Tell women with recovered function that relapse remains common, not that the risk is gone
• Give women with ejection fraction below 50% the mortality figure plainly and discuss contraception
• Arrange a baseline echocardiogram before or early in the pregnancy, with repeat imaging in the third trimester and postpartum
• Plan delivery in a unit with cardio-obstetric support

Why it matters

A normal ejection fraction is often read as clearance for another pregnancy, and relapse rates say it is not.

Don't overread it

Six small cohorts with few deaths — the mortality estimates are imprecise and the comparison is not randomised.

The statistics, in plain English

A relapse rate ratio of 0.77 with an interval running from 0.50 to 1.19 crosses 1.0, so the study cannot say recovery lowers relapse — it may, slightly, or it may not. The mortality interval (0.09–0.87) stays below 1.0, but it is wide because it rests on few deaths among 266 women. I² near 0% means the six studies agreed.

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