Which equation helps you for echocardiographic measurements and thus in clinical decision-making? Z-scores are of real advantage to the clinician in accurately quantifying size and growth of cardiac dimensions and to the researcher by allowing mathematical comparison of growth in differing subgroups of a disease. Echocardiographic quantification is essential in the diagnosis and management of patients with acquired and congenital heart disease. Cardiovascular allometry is a phenomenon where all cardiovascular structures increase in size relative to somatic growth.

Expressing measurements relative to body size and structures allows a meaningful distinction between normal and abnormal values in children. Z-scores are the way of expressing the deviation of a given measurement from the size or age specific population mean. In paediatric cardiological practice, Z-scores are means of charting…