Pressure Half-Time in Pulmonary Regurgitation
Calculate
m/s
Severity:
Assessing pulmonary regurgitation on TEE?
Practice it on real intraoperative cases.
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How to get PR Severity PHT.
- Obtain a PWD or a CWD of the pulmonary valve. The flow profile of the pulmonic valve, in pulmonic regurgitation, will show a diastolic flow profile that decays over the diastolic time period. Utilizing the caliper function, mark the Vmax and Vmin to calculate the slope and pressure half time of the diastolic flow profile. A steep slope and a short PHT will be indicative of severe pulmonic regurgitation. Note that mild or moderate pulmonic regurgitation is NOT holodiastolic, whereas severe pulmonic regurgitation IS holodiastolic. In aortic regurgitation, mild and moderate regurgitation ARE holodiastolic, whereas severe aortic regurgitation IS NOT holodiastolic. The differences in the two valve disorders occur because of the pressure differential between the respective ventricular cavities and the great vessels.