Left Ventricular Filling Pattern in Beta-thalassaemia Major--a Doppler Echocardiographic Study

The pattern of left ventricular filling was assessed by Doppler echocardiography in 38 adult beta-thalassaemia major patients; 28 with normal (age 25.2 +/- 5.3 years) and 10 with abnormal (age 24.5 +/- 8.8 years) left ventricular systolic function. The findings were compared with those obtained from 38 age and sex matched normal individuals. In patients with normal left ventricular systolic function, peak flow velocity in early diastole was higher than in the controls (94 +/- 16 vs 79 +/- 12 cm.s-1, P < 0.001). The peak flow velocity in late diastole was also greater (60 +/- 18 vs 46 +/- 9 cm.s-1, P < 0.001), but the ratio between the early and late (atrial) peaks was approximately the same in both groups (1.74 +/- 0.72 vs 1.70 +/- 0.30). There was no difference in deceleration time and rate between the two groups (152 +/- 32 vs 151 +/- 21 ms and 504 +/- 93 vs 508 +/- 115 cm.s-2 respectively). None of the patients had atrial predominant left ventricular inflow pattern. In patients with congestive heart failure the peak flow velocity in early diastole was greater than in the controls (96 +/- 10 vs 79 +/- 2 cm.s-1 P < 0.001) while in late diastole it was smaller (39 +/- 6 vs 44 +/- 2 cm.s-1, P < 0.05). The ratio between the early and late peaks was greater in the patients than in the controls (2.5 +/- 0.35 vs 1.8 +/- 0.08, P < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)