wall motion scoring system
Standardized method for grading regional myocardial contractility. Uses numerical scale from normal (1) to dyskinetic (4) motion.
Full Definition
The wall motion scoring system is a standardized method for quantifying regional left ventricular function using a 16- or 17-segment model. Each segment is assigned a score: 1 = normal/hyperkinetic, 2 = hypokinetic, 3 = akinetic, 4 = dyskinetic, and 5 = aneurysmal. The wall motion score index (WMSI) is calculated as the sum of all segment scores divided by the number of segments evaluated, providing an overall assessment of global function. Normal WMSI is 1.0, with higher values indicating worse function. This system enables standardized communication of regional dysfunction and facilitates comparison between studies and institutions.
Usage
Usage note: Specify segment model used (16 vs 17 segment); ensure consistent scoring criteria across readers.
In Context
- "The wall motion scoring system revealed a WMSI of 1.8 with inferior and posterior akinesis." — Echocardiography report
- "Stress echocardiography showed worsening wall motion scoring from 1.2 to 1.9 with dobutamine." — Stress imaging report