RT Journal Article SR Electronic T1 To what extent does the size of a ventricular septal defect correlate with haemodynamic data derived from cardiac catheterisation? JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 19 OP 23 DO 10.1136/hrt.58.1.19 VO 58 IS 1 A1 Fukazawa, M A1 Honda, S A1 Fukushige, J A1 Sunagawa, H A1 Yasui, H A1 Ueda, K YR 1987 UL http://heart.bmj.com/content/58/1/19.abstract AB A simplified model based on Gorlin's formula was used to derive an index of the cross sectional area of ventricular septal defects from commonly used cardiac catheterisation data. This index was compared with the area of the defect measured during operation and expressed as a ratio to the cross sectional area of the aorta. The highly significant linear relation (r = 0.94) between this index of the defect area and the size of the defect measured at operation means that the severity of a ventricular septal defect can be assessed from haemodynamic data obtained at cardiac catheterisation.