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Abstract
Congenital heart diseases are a very common and serious problem in the pediatric age group and despite the advances in their treatment they remain the leading cause of death in children with congenital malformations.
The left to right shunt lesions are the most common acyanotic congenital heart diseases that result in increased volume load which is the major cause of development of congestive heart failure in these patients.
In the presence of congestive heart failure, systohc and diastolic dysfunction frequently coexist.
Numerous studies have shown that systohc and diastolic time intervals are closely linked to systolic and diastolic left ventricular performance. Although individual time intervals of the cardiac cycle can be easily obtained from Doppler velocity profiles as measurements of cardiac function, heart rate and load dependency have limited their clinical use.
Tei et al.1996 proposed a Doppler-derived index for assessment of overall left ventricular function that combines systolic and diastolic time intervals. The myocardial performance index is potentially applicable not only to the evaluation of global left ventricular function but also to the evaluation of right ventricular function in children with congenital heart disease.
This index has been found to be reproducible, easily obtainable and to correlate closely with invasive measures of both systolic and diastolic