fractional area change
Also written as: FAC — fractional area change
Echocardiographic measure of right ventricular systolic function expressed as percentage change in ventricular area.
Full Definition
A two-dimensional echocardiographic parameter used to assess right ventricular systolic function by measuring the percentage change between end-diastolic and end-systolic ventricular areas. Calculated as (end-diastolic area - end-systolic area)/end-diastolic area × 100. Normal values typically exceed 35%. This measurement is particularly important in cardiothoracic surgery where right heart function may be compromised by surgical manipulation or underlying pathology.
Usage
Usage note: Often abbreviated as FAC in clinical documentation; ensure context clarifies this refers specifically to right ventricular function.
In Context
- "Preoperative TEE revealed a fractional area change of 28%, indicating moderate right ventricular dysfunction." — Anesthesia record
- "The patient's fractional area change improved to 42% following successful valve repair." — Postoperative note