A 28-year-old primigravida at 32 weeks gestation presents for routine antenatal care. Ultrasound shows a normally grown fetus with no structural anomalies. The patient asks about the physiologic changes in her heart and uterus during pregnancy. Her obstetrician explains that both organs undergo significant enlargement. A follow-up echocardiogram shows left ventricular hypertrophy and increased chamber dimensions. What is the most appropriate next step in management of the cardiac changes?