Effect of pregnancy on bioprosthetic structural valve degeneration.

Background: Despite increasing frequency of pregnancies among patients with cardiac conditions, including the presence of prosthetic heart valves, data on the effects of physiological changes during pregnancy on the function of bioprosthetic valves remains scarce and shows conflicting results. Objectives: This study was aimed to determine the effect of pregnancy on the rate of bioprosthetic structural valve degeneration. Methods: We designed a retrospective matched cohort study of patients seen between June 2018 and February 2023. All pregnant patients with bioprosthetic valves were matched to non-pregnant controls with prior valve replacement based on bioprosthetic valve location, time since valve implantation, age of the patient at valve implantation and time between baseline and follow up echocardiograms. Echocardiograms of pregnant patients were evaluated for bioprosthetic structural valve degeneration grade based on a dedicated scale before and after pregnancy. Non-pregnant controls had echocardiogram scoring of structural valve degeneration over a similar time period. Results: Thirty four pregnant patients with bioprosthetic valves in the pulmonary, aortic and mitral positions were matched with 71 non-pregnant controls with identical bioprosthetic valves locations. Over a median follow up period of 13.5 months that included the gestational period, 18 (53 %) pregnant patients had an increase in structural valve degeneration score as compared to 17 (26 %) of the non-pregnant patients in median follow up of 13.7 months (OR 3.87, p = 0.004). On multivariable analysis, pregnancy was the only variable associated with increased structural valve degeneration score. Conclusions: Our results suggest that pregnancy is associated with increased bioprosthetic structural valve degeneration.