Measuring Pressure Half-Time for MVA

🚨When measuring Pressure Half-Time (T½) from the mitral inflow E-wave, one common mistake can completely mislead your assessment 👇

❌ Wrong Way:

Measuring directly from the early steep deceleration slope

➡️ Gives a shorter T½

➡️ Leads to overestimation of Mitral Valve Area (MVA)

✅ Correct Way:

Use a line-drawing method through the linear mid-portion of the E-wave

➡️ More accurate representation of deceleration

➡️ Gives a true T½

📌 Why it matters?

Because:

MVA = 220 / T½

👉 Underestimated T½ = Overestimated MVA = ❗Potential misclassification of mitral stenosis

💡 Pro Tip:

If the E-wave slope is bimodal or non-linear,

👉 Ignore the early part

👉 Extrapolate the mid-slope instead

🎯 Take-home:

👉 Always avoid the early steep slope in bimodal E-wave.

👉 Use the linear mid-slope extrapolation for accurate T½ measurement

💬 Have you encountered this pitfall in your echo practice?

#lifestyle

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