Right Ventricular Pressure Flow Relationships and Intracardiac Venturi Effects in Fallot's Tetralogy

Functional Adaptations of the Right Ventricular Outflow Tract in Congenital Heart Disease

“…Though there is as a rule no conventional systolic pressure gradient in this type of infundibular stenosis because the outflow tract is reduced in diameter over its whole length (Watson et al, 1960), it can usually be detected on careful catheter withdrawal by the shape of the infundibular pressure pulse which shows a fall in pressure during systole as the blood travels with increased vzlocity along the narrowed lumen (Watson and Lowe, 1962;Watson, Breckenridge, and Lowe, 1964).…”