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Left ventricular diastolic Doppler characteristics in beta-thalassemia major
D T Kremastinos1, D P Tsiapras, G A Tsetsos
1Cardiology Department, Athens General Hospital, University of Athens Greece Medical School.
Insights
Diastolic function in beta-thalassemia major patients with normal systolic function shows increased flow velocities, likely due to chronic anemia. Severe iron overload can cause restrictive abnormalities in left ventricular filling.
Area of Science:
- Cardiology
- Hematology
- Echocardiography
Background:
- Diastolic left ventricular function is crucial for cardiac health.
- Its assessment via Doppler echocardiography in beta-thalassemia major has been limited.
- Understanding these mechanisms is vital for patient management.
Purpose of the Study:
- To investigate diastolic left ventricular function in beta-thalassemia major patients.
- To compare Doppler echocardiographic findings with healthy controls.
- To identify factors associated with diastolic dysfunction.
Main Methods:
- Doppler echocardiography was used to assess left ventricular inflow and pulmonary vein flow.
- 88 beta-thalassemia major patients (young and adult) were studied.
- Findings were compared to 46 healthy individuals.
Main Results:
- Beta-thalassemia patients exhibited higher peak flow velocities (E and A waves) and pulmonary vein velocities compared to controls.
- No significant differences were observed in E/A ratio, deceleration time, or isovolumic relaxation time.
- Restrictive abnormalities were found in older patients with high ferritin levels, associated with increased ventricular wall thickness and chamber dilation.
Conclusions:
- Elevated Doppler diastolic indexes in beta-thalassemia major likely reflect increased preload from chronic anemia.
- Severe myocardial iron deposition is the primary cause of restrictive left ventricular filling abnormalities.
- Regular monitoring of diastolic function and iron levels is recommended.
Background:
Diastolic left ventricular function expressed by diastolic Doppler characteristics of the left ventricle has never been properly investigated.
Methods And Results:
Left ventricular inflow and pulmonary vein flow patterns were assessed by Doppler echocardiography in 88 beta-thalassemia major patients with normal left ventricular systolic function; 34 were young (age, 15.1 +/- 3.2 years) and 54 were adults (age, 25.1 +/- 3.6 years). The findings were compared with those obtained from 22 young (age, 13.8 +/- 2.4 years) and 24 adult (age, 25.3 +/- 4.1 years) normal individuals. In both groups of patients, peak flow velocities in early (E) and late (A) diastole were higher than in the control subjects (young E: P < .01; adult E: P < .001; young A: P < .05; adult A: P < .05), whereas no difference was found in the E/A ratio, deceleration time, or isovolumic relaxation time. Pulmonary vein systolic (S) and diastolic (D) velocities were also higher in beta-thalassemia major patients compared with the control subjects (young S: P < .05; adult S: P < .05; young D: P < .05; adult D: P < .05). Restrictive left ventricular abnormalities were only found in 7 patients who were among the oldest beta-thalassemia major population of the adult group (P < .01) with highly elevated mean serum ferritin. In comparison to the remaining adult patients, interventricular septum and left ventricular posterior wall thickness were increased (P < .01 and P < .01, respectively). The left atrium and right ventricle were dilated (P < .05 and P < .01, respectively).
Conclusions:
Doppler diastolic indexes in beta-thalassemia major patients with normal left ventricular systolic function are similar to those seen in conditions with an increased preload, probably because of chronic anemia. Only severe iron loading and deposition in the myocardium leads to the restrictive abnormalities of left ventricular filling.