Myocardial Performance Index (Tei Index)

Myocardial Performance Index (Tei Index) – An Interesting One

The Tei Index, introduced by Dr. Chuwa Tei, is a Doppler-derived, noninvasive parameter that evaluates global ventricular performance, integrating both systolic and diastolic functions into a single measure.

How It’s Measured:

⬜ Acquired using pulsed and continuous wave Doppler from:

• Mitral inflow (Apical 4-Chamber view)

• Left ventricular outflow (Apical 5-Chamber view)

⬜ Key intervals measured:

a. IVCT – Isovolumetric Contraction Time

b. IVRT – Isovolumetric Relaxation Time

c. ET – Ejection Time

Formula:

👉 Tei Index = (IVCT + IVRT) / ET

👉 Tei Index = (a - b) / b

where:

a = time from mitral valve closure to opening

b = aortic ejection time

Normal Values:

LV Tei Index: ≤ 0.40

RV Tei Index: ≤ 0.43

Interpretation:

🔵 Higher Tei Index → Impaired ventricular function

🔵 Detects early ventricular dysfunction, even when LVEF appears normal

Clinical Significance:

Useful in assessing cardiomyopathies, heart failure, congenital heart disease, and post-transplant monitoring

Applicable in both pediatric and adult cardiology

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