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Echocardiographic abnormalities in patients with transfusion-dependent anemia and secondary myocardial iron
Insights
Echocardiography reveals cardiac structural changes in patients with iron overload, even without obvious symptoms. Deterioration in systolic function indicates a poor prognosis for myocardial iron deposition.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Hematology
Background:
- Myocardial iron deposition is a risk for patients with congenital anemia or hemochromatosis.
- Cardiac complications can arise from chronic iron overload.
- Early detection of cardiac involvement is crucial for patient management.
Purpose of the Study:
- To assess cardiac structure and function in patients at risk for myocardial iron deposition using echocardiography.
- To compare echocardiographic findings in patients with iron overload to normal subjects.
- To identify echocardiographic indicators of poor prognosis in this patient group.
Main Methods:
- Echocardiography was performed on 56 patients with risk factors for iron overload (congenital anemia, hemochromatosis).
- Cardiac measurements were compared to 105 age-matched healthy individuals.
- Echocardiographic data were analyzed in relation to body surface area.
Main Results:
- The majority of patients showed increased left ventricular wall thickness, dimensions, mass, and left atrial dimensions.
- Cardiac enlargement was infrequent on chest films (32%) and ECGs (16%).
- Left ventricular ejection fraction remained normal except in four patients who died within six months, indicating poor prognosis.
Conclusions:
- Echocardiography is a valuable noninvasive tool for evaluating cardiac structural and functional changes in patients with myocardial iron deposition risk.
- Serial echocardiographic assessment can aid in managing patients at risk for iron overload complications.
- Systolic function deterioration identified by echocardiography is a significant indicator of poor prognosis.
Abstract:
The heart was evaluated by echocardiography in 56 patients at risk for myocardial iron deposition. Fifty-four had congenital anemia for which they required repeated transfusions, and two had primary hemochromatosis. The data, plotted according to one of three functions of the body surface area, were compared to values obtained in 105 normal subjects whose age spanned a similar range. Left ventricular wall thickness, transverse dimension and mass, as well as left atrial transverse dimension, were increased in the majority of patients with chronic iron overload despite the infrequent occurrence of cardiac enlargement on routine chest films (32 per cent) or electrocardiographic abnormality (16 per cent). Left ventricular ejection fraction was normal in all but four patients. These four patients died within a six month follow-up period suggesting that deterioration in systolic function is an indicator of poor prognosis. Our findings indicate that echocardiography provides a simple noninvasive means for assessing changes in cardiac structure and function that should prove useful in the serial evaluation of patients who are at risk for the development of myocardial iron deposition.