What question did this study set out to answer?

This study evaluates the prognostic value of mitral valve calcium scoring via cardiac CT before percutaneous mitral commissurotomy.

February 25, 2026

Cardiac CT-scan for mitral valve calcification assessment before percutaneous commissurotomy: the multicenter prospective CALCIMIT study

Key Result

Lower CT-based mitral valve calcium score independently predicted better immediate PMC success and long-term event-free survival (HR 1.54; p=0.019) in 172 patients.

Key Points

This study evaluates the prognostic value of mitral valve calcium scoring via cardiac CT before percutaneous mitral commissurotomy.
Conducted a multicenter prospective study from 2016 to 2019.
Included 172 patients undergoing non-contrast cardiac CT prior to percutaneous mitral commissurotomy.
Mitral Valve Calcium Scoring (MVCS) was quantified using Agatston's method.
Primary endpoint was good immediate results (GIR); secondary endpoint was long-term event-free survival.
66% of patients had mitral calcification as assessed by CT.
54.7% of patients achieved good immediate results after PMC.
MVCS showed independent association with long-term survival free of mitral reintervention, with a hazard ratio of 1.54.
An MVCS threshold of 385.5 Agatston Units predicted both immediate and late outcomes.

Structured PICO

Does preprocedural CT-derived Mitral Valve Calcium Scoring predict immediate and long-term outcomes in patients with rheumatic mitral stenosis undergoing percutaneous mitral commissurotomy?

Population

172 consecutive patients with rheumatic mitral stenosis undergoing percutaneous mitral commissurotomy (PMC), mean age 56±15 years, 78% women.

Intervention

Preprocedural non-contrast cardiac CT for Mitral Valve Calcium Scoring (MVCS) using Agatston's method

Outcome

Good immediate result (GIR), defined as final mitral valve area ≥1.5 cm² with ≥50% increase and ≤2/4 mitral regurgitation (MR)composite

Preprocedural CT-derived Mitral Valve Calcium Scoring provides independent and reproducible prognostic information for predicting immediate success and long-term outcomes after percutaneous mitral commissurotomy.

Main Result

Absolute Event Rate: 0% vs 0%

Abstract

Abstract Aims Percutaneous mitral commissurotomy (PMC) is the reference treatment for rheumatic mitral stenosis (MS). In high-income countries, mitral valve calcification is frequent. Computed tomography (CT) enables Mitral Valve Calcium Scoring (MVCS), but its prognostic value in rheumatic MS has not been prospectively evaluated. The CALCIMIT study assessed the reproducibility and prognostic value of the MVCS by CT on immediate and long-term outcomes after PMC. Methods and results In this prospective multicenter study, patients underwent non-contrast cardiac CT before PMC. MVCS was quantified using Agatston’s method. The primary endpoint was good immediate result (GIR), defined as final mitral valve area ≥1.5 cm² with ≥50% increase and ≤2/4 mitral regurgitation (MR). The secondary endpoint was long-term event-free survival (death or mitral reintervention). Between 2016 and 2019, 172 consecutive patients (mean age 56±15 years; 78% women) were included. According to CT, 113 patients (66%) had mitral calcification. GIR of PMC was achieved in 54.7% of patients. Independent predictors of GIR included lower CT-based MVCS, lower NYHA class, and lower baseline MR grade. MVCS was also independently associated with long-term survival free of mitral reintervention (HR 1.54, 95% CI 1.07–2.21; p=0.019). A threshold of 385.5 Agatston Units predicted both immediate and late outcomes. Interobserver reproducibility was excellent (calcification detection: Kappa 0.987; MVCS correlation: r=0.999). Conclusions CT-derived MVCS provides independent, reproducible prognostic information for immediate and long-term outcomes after PMC, beyond conventional echocardiographic scores. Integrating MVCS into preprocedural assessment may improve patient selection for PMC.

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