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A modified definition for peripartum cardiomyopathy and prognosis based on echocardiography
J U Hibbard1, M Lindheimer, R M Lang
1Department of Obstetrics and Gynecology, University of Chicago, Pritzker School of Medicine, Illinois 60637, USA. jhibbard@babies.bsd.uchicago.edu
Insights
Peripartum cardiomyopathy diagnosis needs uniform criteria, including strict echocardiographic measures. A new stress test aids in assessing recovery and guiding future pregnancy decisions for affected women.
Area of Science:
- Cardiology
- Obstetrics
- Medical Diagnostics
Background:
- Peripartum cardiomyopathy (PPCM) diagnosis is challenging, often relying on exclusion and variable clinical criteria.
- Lack of uniform diagnostic standards, particularly echocardiographic criteria, hinders research and clinical consistency.
- Existing diagnostic approaches may not accurately reflect the condition's severity or prognosis.
Purpose of the Study:
- To propose uniform diagnostic criteria for peripartum cardiomyopathy, incorporating strict echocardiographic parameters.
- To introduce a modified pharmacologic echocardiographic stress test for assessing left ventricular contractile reserve in PPCM survivors.
- To provide data for counseling women regarding future childbearing after PPCM.
Main Methods:
- Review and proposal of new diagnostic criteria for PPCM, including timing, exclusion of prior heart disease, and specific echocardiographic measures (ejection fraction <45%, fractional shortening <30%, end-diastolic dimension >2.7 cm/m²).
- Description of a modified pharmacologic echocardiographic stress test to evaluate left ventricular function under hemodynamic stress.
- Analysis of mortality rates and prognostic factors in PPCM based on echocardiographic findings.
Main Results:
- Proposed criteria integrate clinical and strict echocardiographic findings for a more standardized PPCM diagnosis.
- The modified stress test can identify reduced cardiac reserve in women with apparent recovery.
- High mortality (25-50%) associated with PPCM underscores the need for accurate diagnosis and prognosis.
Conclusions:
- Establishing uniform diagnostic criteria, including echocardiographic standards, is crucial for advancing PPCM research and management.
- The novel stress test offers valuable insights into cardiac reserve and aids in reproductive counseling for PPCM patients.
- Accurate assessment of left ventricular function is vital for determining long-term prognosis and guiding patient care decisions.
Abstract:
The diagnosis of peripartum cardiomyopathy is one of exclusion, made after careful search for an underlying cause. Research in this area is compromised by the reliance of some on clinical criteria alone without strict echocardiographic criteria. This article argues for uniform criteria that define peripartum cardiomyopathy, similar to the criteria for idiopathic dilated cardiomyopathy set forth by a National Heart, Lung, and Blood Institute-sponsored workshop and proposes that the new definition include heart failure within the last month of pregnancy or 5 months postpartum; absence of preexisting heart disease; no determinable etiology, the traditional definition; and strict echocardiographic criteria of left ventricular dysfunction: ejection fraction less than 45%, or M-mode fractional shortening less than 30%, or both, and end-diastolic dimension more than 2.7 cm/m2. Mortality from peripartum cardiomyopathy remains high, 25-50%, and a recent review related long-term prognosis to echocardiographic measures of left ventricular chamber dimension and function at diagnosis and recovery. We describe a modified pharmacologic echocardiographic stress test that might be useful in determining left ventricular contractile reserve in women believed to be recovered by routine echocardiographic studies. The test reproduces hemodynamic stress akin to pregnancy, and the data might be useful when counseling women on future childbearing. Women who respond with reduced cardiac reserve might be advised to avoid pregnancy.