Stroke volume (SV) raised enthusiasm in the early investigations of rheumatic MS pathophysiology and was considered as a key component triggering dyspnea. Giving the discrepancies uncovered in later studies, its importance was later downgraded. The objective of this study was to assess correlations between LA reservoir function (LASr) and global left ventricular longitudinal strain (LVS) determined by 2D STE and stroke volume index (SVI). We performed TTE in a cohort of patients with rheumatic MS. Basic 2D and doppler parameters were recorded such as mean trans-mitral gradient (MTMG), mitral valve area (MVA) with 2D planimetry and PHT. Studied parameters represent mean of three consecutive cardiac cycles. LASr data was obtained on a dedicated 4C view with STE technique. LVS was generated based on the 3 basic apical views. Low-flow state was defined as a SVI ≤ 35 mL/m2. One hundred and ninety-five patients were included between February 2018 and October 2021. We divided our cohort into two groups: group I with SVI ≤ 35 mL/m2 and group II with SVI > 35 mL/m2. There was not a significant difference in terms of age (49.8 ± 12 vs. 51.6 ± 10 yrs, P = 0.3), sex (70.7 vs. 72.2% were female, P = 0.8) and history of atrial fibrillation (67.4 vs. 55.7%, P = 0.09). 2D MVA was significantly lower in group I (1.22 ± 0.4 vs. 1.43 ± 0.5 cm2, P = 0.003). Surprisingly, MVA determined with PHT did not significantly differ (1.43 ± 0.6 vs. 1.39 ± 0.4 cm2, P = 0.5). The incidence of severe dyspnea was (44.3 vs. 44.4%, P = 0.9). TRVmax levels (3.23 ± 0.6 vs. 3.07 ± 0.6 m/s, P = 0.14) were comparable. Group I had significantly higher MTMG (12.1 ± 7 vs. 9.8 ± 4 mmHg, P = 0.01). LVS and LVEF were significantly lower in low-flow patients: (−15 ± 4 vs. −18 ± 2%, P < 0.001) and (61.1 ± 8% vs. 64.2 ± 5%, P = 0.04) respectively. LASr was higher in normal flow patients but did not reach the statistical significance. (9.5 ± 7 vs. 11.5 ± 6%, P = 0.062). MVA, LVS and LVEF were significant associates of low-flow state in MS patients. LA reservoir function was not significantly correlated to SVI.