Key result
Patients with pure pulmonary stenosis often maintain a resting systemic blood flow within normal limits despite the potential restriction caused by a closed ventricular septum and stenosed valve.
Observational
Despite the potential restriction of systemic flow in pure pulmonary stenosis, resting systemic flow is often maintained within normal limits.
Measurements of blood flow by the direct Fick method at cardiac catheterization have shown that in conditions such as Fallot's tetralogy, the resting systemic flow is within normal limits In pure pulmonary stenosis the association of a closed ventricular septum with a stenosed valve gives a greater potential restriction of systemic flow, but in practice a large proportion of cases show a resting flow that is within normal limits (Campbell, 1954); and cases with an increased flow through the pulmonary circuit are receiving increasing recognition
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Roy J. Shephard (1955) conducted an observational in Pulmonary stenosis. Pure pulmonary stenosis was evaluated on Resting systemic blood flow. Patients with pure pulmonary stenosis often maintain a resting systemic blood flow within normal limits despite the potential restriction caused by a closed ventricular septum and stenosed valve.
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