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Title: Usefulness of Vena Contracta for Identifying Severe Secondary Mitral Regurgitation: A Three-Dimensional Transesophageal Echocardiography Study.
Author: Onishi H, Izumo M, Naganuma T, Akashi YJ, Nakamura S.
Journal: Rev Cardiovasc Med; 2023 Aug; 24(8):233. PubMed ID: 39076725.
Abstract:
BACKGROUND: In secondary mitral regurgitation (SMR), effective regurgitant orifice area by the proximal isovelocity surface area method ( EROA PISA ) evaluation might cause an underestimation of regurgitant orifice area because of its ellipticity compared with vena contracta area (VCA). We aimed to reassess the SMR severity using VCA-related parameters and EROA PISA . METHODS: The three-dimensional transesophageal echocardiography data of 128 patients with SMR were retrospectively analyzed; the following parameters were evaluated: EROA PISA , anteroposterior and mediolateral vena contracta widths (VCWs) of VCA (i.e., VCW AP and VCW ML ), VCW Average calculated as ( VCW AP + VCW ML )/2, and VCA Ellipse calculated as π × ( VCW AP /2) × ( VCW ML /2). Severe SMR was defined as ≥ 0.39 cm 2 . RESULTS: The mean age of the patients was 77.0 ± 8.9 years, and 78 (60.9%) were males. Compared with EROA PISA (r = 0.801), VCW Average (r = 0.940) and VCA Ellipse (r = 0.980) were strongly correlated with VCA. On receiver-operating characteristic curve analysis, VCW Average and VCA Ellipse had C-statistics of 0.981 (95% confidence interval [CI], 0.963-1.000) and 0.985 (95% CI, 0.970-1.000), respectively; these were significantly higher than 0.910 (95% CI, 0.859-0.961) in EROA PISA (p = 0.007 and p = 0.003, respectively). The best cutoff values for severe SMR of VCW Average and VCA Ellipse were 0.78 cm and 0.42 cm 2 , respectively. The prevalence of severe SMR significantly increased with an increase in EROA PISA (38 of 88 [43.2%] patients with EROA PISA < 0.30 cm 2 , 21 of 24 [87.5%] patients with EROA PISA = 0.30-0.40 cm 2 , and 16 of 16 [100%] patients with EROA PISA ≥ 0.40 cm 2 [Cochran-Armitage test; p < 0.001]). Among patients with EROA PISA < 0.30 cm 2 , SMR severity based on VCA was accurately reclassified using VCW Average (McNemar's test; p = 0.505) and VCA Ellipse (p = 0.182). CONCLUSIONS: Among patients who had SMR with EROA PISA of < 0.30 cm 2 , suggestive of moderate or less SMR according to current guidelines, > 40% had discordantly severe SMR based on VCA. VCW Average and VCA Ellipse values were useful for identifying severe SMR based on VCA in these patients.

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