Evaluation before attempting a second pregnancy
A 31-year-old landscape architect presents for evaluation before attempting a second pregnancy. Her first delivery three years ago was uncomplicated. Six weeks postpartum, she developed progressive exertional dyspnea, leg swelling, and orthopnea requiring three pillows. An urgent care clinician prescribed a brief course of furosemide for presumed fluid retention, and her symptoms resolved over subsequent months. She is currently asymptomatic and walks three miles daily. Blood pressure is 114/72 mm Hg, pulse is 68/min, and respiratory rate is 14/min. Physical examination, including cardiac auscultation and pulmonary exam, is normal. Which of the following is the most appropriate next diagnostic test?
See the answer and explanation below:
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C
Explanation
Clinical Pearl:
Pre-pregnancy evaluation in patients with a history consistent with peripartum cardiomyopathy requires transthoracic echocardiography because persistent left ventricular systolic dysfunction poses severe maternal and fetal risks.
Explanation:
This patient's postpartum presentation of orthopnea, paroxysmal exertional dyspnea, and peripheral edema six weeks following delivery is characteristic of peripartum cardiomyopathy that was unrecognized and empirically treated. Current cardiovascular society guidance mandates transthoracic echocardiography to assess left ventricular dimensions and ejection fraction before any subsequent pregnancy in patients with prior peripartum cardiomyopathy. Persistent left ventricular systolic dysfunction carries an unacceptably high risk of maternal mortality and clinical deterioration, whereas documented normalization of ejection fraction allows informed discussion of residual relapse risk. Cardiopulmonary exercise testing provides an objective assessment of functional capacity but cannot visualize cardiac anatomy or quantify resting ejection fraction. Ambulatory electrocardiographic monitoring detects dysrhythmias but fails to determine ventricular systolic recovery or structural remodeling. Coronary computed tomographic angiography evaluates epicardial coronary artery disease or dissection, which are unlikely in this young, asymptomatic patient without angina, and incurs unnecessary radiation exposure. Right heart catheterization provides direct hemodynamic measurements but is an invasive test reserved for unexplained pulmonary hypertension or decompensated heart failure refractory to therapy.
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