Comparison of tissue doppler derived systolic strain between different severities of left ventricular dysfunction in patients having rheumatic severe mitral regurgitation. J Fatima Jinnah Med Univ [Internet]. 2020 Jan. 15 [cited 2026 Apr. 11];13(4):145-9. Available from: https://jfjmu.com/index.php/ojs/article/view/631