When evaluating mitral stenosis with Doppler in a patient with atrial fibrillation, the average velocity and PHT should be reported from how many different waveforms?

When evaluating mitral stenosis with Doppler in a patient with atrial fibrillation, the average velocity and PHT should be reported from how many different waveforms?

• A. 1
• B. 2-3
• C. 5 or more
• D. 4

Answer: (C)

When mitral inflow is assessed with Doppler in atrial fibrillation, the rhythm's irregularity causes beat-to-beat variation in diastolic filling. That means a single waveform can misrepresent the true flow velocity and the deceleration slope used to derive the pressure half-time. To obtain a stable, representative estimate, you need multiple distinct cardiac cycles and average the measurements across them. Collecting measurements from several waveforms—five or more—reduces the impact of an unusually long or short diastolic interval and yields a more reliable average velocity and PHT. This approach is especially important in AF, where variability between beats is substantial, making multiwaveform averaging essential for accurate mitral stenosis assessment.

When mitral inflow is assessed with Doppler in atrial fibrillation, the rhythm's irregularity causes beat-to-beat variation in diastolic filling. That means a single waveform can misrepresent the true flow velocity and the deceleration slope used to derive the pressure half-time. To obtain a stable, representative estimate, you need multiple distinct cardiac cycles and average the measurements across them. Collecting measurements from several waveforms—five or more—reduces the impact of an unusually long or short diastolic interval and yields a more reliable average velocity and PHT. This approach is especially important in AF, where variability between beats is substantial, making multiwaveform averaging essential for accurate mitral stenosis assessment.