Echocardiography Techniques II Exam 2 Practice

What is the normal PHT range for the mitral valve (MV)?

60-100 m/s 3-60 m/s 150-219 m/s >220 m/s

Correct Answer:

3-60 m/s

Explanation:

Pressure half-time is a time interval, not a velocity. It measures how quickly the transmitral pressure gradient falls in early diastole and is used to estimate mitral valve area (MVA) with the equation MVA = 220 / PHT (in milliseconds). The normal range for PHT is about 40–60 ms. This corresponds to a normal MVA roughly in the 4–6 cm² range. As PHT lengthens, the valve area decreases (more stenotic); as PHT shortens, the valve area increases. The options listed use velocity units (m/s), but PHT is a time value, so those choices aren’t in the correct units. In practice, you’d report PHT in milliseconds and apply it to the MVA calculation to assess mitral stenosis severity.

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