The myocardial performance index (MPI) is a simple quantitative, non-geometric index of ventricular function and is readily applicable for evaluation of the right and left ventricle function. The aim of the study was to assess normal MPI values in healthy children. We studied 38 healthy children from 3 to 18 years of age. The normal values of both, the left ventricular and right ventricular MPI were 0.32 +/- 0.07 and 0.27 +/- 0.09, respectively. Measurement of the MPI is non-invasive and easily obtainable and does not prolong the time required for examination. It is independent from ventricular geometry, blood pressure, heart rate and it appears to be of great prognostic value in many different clinical settings (Tab. 2, Fig. 1, Ref. 14). Full Text in free PDF www.bmj.sk.