Long-Term Recovery of Reduced Left Ventricular Ejection Fraction after Aortic Valve Replacement in Patients with Bicuspid Aortic Valve Disease

Abstract

Background Long-term prognosis of patients with bicuspid aortic valve (BAV) disease and poor left ventricular ejection fraction (LVEF) who underwent aortic valve replacement (AVR) is unknown. We aimed to analyze the recovery of LVEF and incidence of adverse events after AVR in patients with BAV and poor LVEF.

Materials and Methods A total of 90 consecutive BAV patients (mean age 57 ± 10 years, 89% male) with baseline LVEF ≤40% underwent an isolated AVR between January 1, 1995, and June 30, 2008, and served as our study population. Follow-up data (800 patient-years) were obtained for all 90 hospital survivors. A subgroup of patients who underwent AVR for BAV stenosis (Group aortic stenosis [AS], n = 70) was compared with those who underwent AVR for BAV regurgitation (Group aortic regurgitation [AR], n = 20). Primary end point was the recovery of LVEF in AS Group versus AR Group. Secondary end points were survival and freedom from adverse cardiac events (i.e., cardiac-related death and need for reinterventions due to persisting heart failure).

Results There was a significant increase in LVEF (mean follow-up 9.0 ± 5 years) in AS versus AR Group (i.e., 32 ± 7% [baseline] and 53 ± 9% [follow-up], p < 0.001 in AS Group vs. 33 ± 7% [baseline] and 38 ± 13% [follow-up], p = 0.07 in AR Group). Recovery rate of LVEF was significantly higher in AS Group versus AR Group (i.e., 2.8 percentage points (pp)/year vs. 0.7 pp/year, respectively). In Group AS, 86% of patients were responders, whereas in Group AR, only 30% (p < 0.001). The subjects in Group AR did not show a difference between baseline and follow-up left ventricular end-diastolic diameter (LVEDD) (baseline 61 ± 12 vs. follow-up 58 ± 8, p = 0.813), whereas in Group AS, there was a significant difference of LVEDD (baseline 56 ± 7 vs. follow-up 54 ± 6 mm, p = 0.019). Ten-year survival was 76 ± 6.5% in AS Group versus 78 ± 11% in AR Group (p = 0.3). Prevalence of late adverse cardiac events was 7% in AS Group versus 40% in AR Group (p = 0.03).

Conclusion The recovery of reduced LVEF after AVR surgery is significantly impaired in patients with BAV regurgitation as compared with BAV stenosis.

Keywords

ejection fraction - AVR - bicuspid aortic valve

Note

The abstract of this article was presented at the 24th Annual World Congress of the World Society of Cardiothoracic Surgeons (WSCTS) held from September 6 to September 10, 2014, in Geneva, Switzerland.

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