Quantitative assessment of pulmonary stenosis severity is based mainly on the transpulmonary pressure gradient1. Calculation of the effective valve area by planimetry is not possible since the required image plane is in general not available. Continuity equation or proximal isovelocity surface area method, although feasible in principle has not been validated in pulmonary stenosis and are rarely performed.
Grading pulmonic stenosis is based on transvalvular gradient pressure. Effective valve area calculation is feasible but is has not been specifically validated in pulmonary stenosis
PSAX view of the pulmonary valve. Thickened leaflets raise the suspicion of pulmonary stenosis.
Colour Doppler view shows flow turbulence on pulmonary flow, the second clue for the diagnosis of pulmonary stenosis.
Continous Doppler evaluation of the velocity flow is the main tool in the evaluation of the severity of pulmonary stenosis. In this case, the peak velocity of flow is about 1.5 m/s. This not high velocity rules out pulmonary stenosis.
PSAX view of the pulmonary valve. Thickened leaflets with restricted movement pattern raise the suspicion of pulmonary stenosis.
Colour Doppler view shows marked flow turbulence on pulmonary flow suggesting pulmonary stenosis.
Continous Doppler evaluation of the velocity shows a pulmonary flow peak velocity of flow over 4 m/s compatible with severe pulmonary stenosis.
Author: Jose Juan Gómez de Diego, Alessia Gimelli, Vladyslav Chubuchny, Emilio Pasanisi
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