Hypertrophic Cardiomyopathy and Pregnancy: A Retrospective Analysis From a Tertiary Care Hospital.

Pregnancy in women with hypertrophic cardiomyopathy is not well described. In this retrospective study, we analyzed data on pregnant women with hypertrophic cardiomyopathy who were under follow-up care in the cardiology department of a tertiary care hospital. We reviewed data on all women registered in the hypertrophic cardiomyopathy cohort and those who attended the cardio-obstetric clinic and delivered between January 2010 and June 2019. From these 2 groups, we identified 7 pregnant women with hypertrophic cardiomyopathy who delivered during this period. These 7 women (mean [SD] age, 25 [3.3] years) had a total of 15 pregnancies (range per woman,1-4). This was a high-risk cohort, as 7 (46.7%) pregnancies were in the modified World Health Organization class III. The mean (SD) left ventricular wall thickness was 19.71 (2.56) mm in all pregnancies. Two of the 7 women with left ventricular outflow tract obstruction developed severe symptoms in the third trimester; these improved soon after delivery. Eight pregnancies without obstruction were well tolerated. Two pregnancies occurred after successful alcohol septal ablation. Both remained asymptomatic throughout pregnancy. All women tolerated labor well. Adverse maternal outcomes, including death, were not seen in any patient. All women who became symptomatic during pregnancy had relief of symptoms after delivery. Most women remained asymptomatic or had mild symptoms during pregnancy. Of the women with left ventricular outflow tract obstruction, 28.6% had severe symptoms that improved after delivery. Pregnancy was well tolerated after successful alcohol septal ablation.