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Published on: November 28, 2018
Prognostic value of left atrial volume index in degenerative mitral stenosis
Idit Yedidya1,2, Steele C Butcher1,3, Jan Stassen1,4
1Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2300 RC, Leiden, The Netherlands.
Insights
An enlarged left atrial volume index (LAVI) in degenerative mitral stenosis (DMS) patients is linked to higher mortality. This echocardiographic measure independently predicts prognosis in DMS, highlighting its clinical significance.
Area of Science:
- Cardiology
- Echocardiography
- Clinical Prognostics
Background:
- Degenerative mitral stenosis (DMS) carries a poor prognosis.
- Mean transmitral gradient (TMG) correlates with outcomes, but other echocardiographic markers require investigation.
- Left atrial volume index (LAVI) is a potential prognostic indicator in DMS.
Purpose of the Study:
- To assess the prognostic value of left atrial volume index (LAVI) in patients with degenerative mitral stenosis (DMS).
Main Methods:
- 155 patients with DMS were analyzed.
- Patients were categorized by LAVI: normal (≤ 34 ml/m2) versus enlarged (> 34 ml/m2).
- Outcomes were assessed over a median follow-up of 25 months.
Main Results:
- Enlarged LAVI was associated with higher left ventricular mass index and increased prevalence of mitral regurgitation and severe aortic stenosis.
- Patients with enlarged LAVI experienced significantly worse prognosis and higher all-cause mortality (p = 0.026).
- In multivariable analysis, enlarged LAVI independently predicted all-cause mortality (HR 2.009, P = 0.038).
Conclusions:
- An enlarged LAVI (> 34 ml/m2) is significantly associated with increased mortality in DMS patients.
- LAVI emerged as the sole independent predictor of prognosis after adjusting for confounders.
- LAVI is a valuable prognostic tool for patients with degenerative mitral stenosis.
Purpose:
Degenerative mitral stenosis (DMS) is associated with a poor prognosis. Although mean transmitral gradient (TMG) has shown a good correlation with outcome, little is known about the association between other echocardiographic parameters and prognosis in patients with DMS. The current study aimed to evaluate the prognostic value of left atrial volume index (LAVI) in patients with DMS.
Methods:
A total of 155 patients with DMS (72[63-80] years, 67% female) were included. The population was divided according to LAVI: normal-sized LAVI (LAVI ≤ 34 ml/m2); and enlarged LAVI (> 34 ml/m2).
Results:
Patients with enlarged LAVI had a higher left ventricular mass index (120[96-146] vs. 91[70-112] g/m2 p < 0.001), as well as a higher prevalence of significant mitral regurgitation and severe aortic stenosis (23% vs. 10% p = 0.046 and 38% vs. 15% p=0.001, respectively) compared to patients with normal-sized LAVI. During a median follow-up of 25 months, 56 (36%) patients died. Patients with enlarged LAVI had worse prognosis compared to patients with normal-sized LAVI (p = 0.026). In multivariable Cox regression model, an enlarged LAVI was independently associated with all-cause mortality (HR 2.009, 95% CI 1.040 to 3.880, P = 0.038).
Conclusion:
An enlarged LAVI (> 34 ml/m2) is significantly associated with excess mortality in patients with DMS. After adjusting for potential confounders, an enlarged LAVI was the only parameter that remained independently associated with prognosis.
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