Patients with severe and very severe mitral stenosis (MS) are not homogenous regarding symptomatology, and some suffer more than others. The RV systolic function is an important determinant of clinical symptoms, exercise capacity, preoperative survival, and postoperative outcome in patients with mitral stenosis The objectives of this study, is to compare RV function in symptomatic and asymptomatic patients with isolated mitral stenosis.

This is a descriptive and analytique study, conducted in Ibn Rochd Center of Cardiology from January 2014 to December 2018, which included all patients with pure severe and very severe MS, devided into two groups according to their functional capacity. Group I (asymptomatic group) with NYHA class I and group II (symptomatic group) with class II–III–IV. The RV systolic function was evaluated by both Doppler tissue imaging, and pulse Doppler, we consider a RV dysfunction when TAPSE 16mm and S’ 9,5cm/s.

In our series there was a female predominance (69%) symptomatic than men (84,42%, versus 69, 23%). Younger patients <45years old, were slightly predominant (51%). Group I consisted of 64patients (25%), group II had 192patients (75%). RV was dilated in 17% in group I, versus 34% of group II RV systolic dysfunction was found in: 29% of symptomatic patients and 14% in asymptomatic patients (P<0.001)

Patient with and impaired RV function are more symptomatic than those with better RV systolic function, without significant difference. This result is confirmed by 2studies conducted in Turkey and India.