DT
Also written as: DT — Deceleration Time
Deceleration time of mitral E-wave, reflecting left ventricular compliance and filling pressure.
Full Definition
Deceleration time measures the time from peak early diastolic velocity (E-wave) to its extrapolated baseline, reflecting the rate of pressure equalization between the left atrium and left ventricle during early diastole. DT is measured using pulsed-wave Doppler at the mitral valve tips. Normal DT ranges from 160-240 milliseconds, with shortened DT (<160ms) suggesting elevated left atrial pressure and restrictive filling, while prolonged DT (>240ms) indicates impaired relaxation. DT interpretation must consider heart rate, age, and loading conditions, and is typically evaluated in conjunction with other diastolic parameters such as E/A ratio and tissue Doppler indices.
Usage
Usage note: Report in milliseconds; interpret in context of other diastolic parameters and clinical findings.
In Context
- "Shortened DT of 140ms indicated elevated filling pressures and restrictive physiology." — Diastolic function assessment
- "DT normalization from 180ms to 200ms suggested improved diastolic function after treatment." — Heart failure follow-up