Arrhythmic mitral valve prolapse: Diagnostic parameters for high-risk patients: A systematic review and meta-analysis.

Abstract

Although frequently considered a benign condition, new evidence has shown that mitral valve prolapse (MVP) is associated with complex ventricular arrhythmias (VAs) and sudden cardiac death (SCD). Therefore, we conducted a systematic review and meta-analysis of the relevant studies to investigate the parameters that could identify MVP patients at higher risk of experiencing complex VAs. We performed a systematic literature search of PubMed for potential studies between January 2010 and January 2021. Our meta-analysis included studies comparing MVP patients with complex VAs (A-MVP) and those without (NA-MVP). We used the fixed-effects model to obtain the odds ratio (OR), risk ratio (RR), or mean difference (MD) and 95% confidence interval (CI) for each analyzed parameter. Six studies with 848 individuals were included in the meta-analysis. As compared to the NA-MVP patients, A-MVP patients had a higher prevalence of inverted T-wave (OR: 2.73; 95% CI: 1.85-4.02; p<.00001) and longer QTc interval on the resting ECG (MD: 14.73; 95% CI: 9.39-20.08; p<.00001), longer anterior mitral leaflet length (MD: 2.67; 95% CI: 2.02-3.31; p<.00001), bi-leaflet prolapse (OR: 1.65; 95% CI: 1.22-2.24; p=.001), and mitral annulus disjunction (MAD) on echocardiogram (RR: 1.90; 95% CI: 1.50-2.40; p<.00001), and late gadolinium enhancement (LGE) on cardiac magnetic resonance (RR: 4.38; 95% CI: 1.77-10.86; p=.001). Our comprehensive meta-analysis suggests that risk factors related to A-MVP are T-wave inversion, longer QTc interval, bi-leaflet prolapse, longer anterior mitral valve leaflet, MAD, and LGE.