Henry et al developed equations for predicting the normal left ventricular internal dimension during diastole. The value measured by echocardiography can be compared to this value for comparison.
(1) body surface area in square meters
(2) age in years
(3) measured left ventricular dimension in centimeters during diastole
predicted left ventricular internal dimension in cm =
= ((45.3 * ((BSA)^0.3)) - (0.03 * (age)) - 7.2) / 10
• The division by 10 is for converting from mm to cm.
measured internal dimension as percent of predicted =
= (measured dimension by echocardiography) / (predicted value)
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