J Korean Pediatr Soc.
2000 Sep;43(9):1192-1199.
Assessment of Ventricular Function Using Myocardial Performance Index in Patients
with Atrial Septal Defect
- Affiliations
-
- 1Department of Pediatrics, School of Medicine, Ajou University, Suwon, Korea.
Abstract
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PURPOSE: This study was designed to define normal values for a nongeometric MPI in children
and evaluate the utility of m%cardial performance index(MPI) in congenital heart disease with
distorted ventricular geometry.
METHODS
The study population consisted of 44 normal patients and 28 patients with atrial
septal defect(ASD) with dilated right ventricle and paradoxical septal motion. Right
ventricular(RV) and left ventricular(LV) isovolumic contraction time, isovolumic relaxation
time, ejection time, ejection fraction and pre-ejection period/ejection time(PEP/ET) were
measured using conventional echo- Doppler methods. The MPI measures the ratio of total time
spent in isovolumic activity(isovolumic contraction time and isovolumic relaxation time) to
ejection time.
RESULTS
In normal children, the RV MPI was 0.33+/-0.09 and the LV MPI was 0.36+/-0.04. In the
ASD group, LV function seemed grossly normal but LV EF was significantly lower than normal
children(57+/-3% vs 67+/-4%, P<0.05), but both LV and RV MPI had no statistically significant
difference. After correction of ASD, RV MPI was increased and LV EF(57+/-3% vs 64+/-3%,
P<0.05) as wll as the RV PEP/ET(0.27+/-0.05 vs 0.38+/-0.06, P<0.05) were significantly
greater than the normal or the preoperation group.
CONCLUSION
Components of the MPI are easily measured with conventional Doppler technique
using standard echocardiographic examination. These results suggest that the MPI is useful as
a means of quantitative assessment of ventricular performance in patients with complex
ventricular geometry, particularly RV.