Rapid estimation of echocardiographic peak velocity of circumferential fibre shortening (peak Vcf).

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Abstract
A transparent grid for estimating peak Vcf [velocity of circumferential fiber shortening] directly from the echocardiograph recording is described. Estimates so obtained were compared with peak Vcf measurements made by an echocardiographic digitizing technique and with the angiographic ejection fraction in 13 patients with normal left ventricular function and 17 patients with impaired left ventricular function. No patient had angiographic segmental wall motion abnormalities. Significant linear correlations were found between peak Vcf derived by the simple manual technique and peak Vcf determined by the digitizing technique and between peak Vcf derived by the simple manual technique and the angiographic ejection fraction. Peak Vcf derived by the simple manual technique was a reliable predictor of ventricular function, being > 1.4 circumferences/s in 11 of 13 patients with angiographic ejection fractions .gtoreq. 55% and < 1.4 in 14 of 17 patients with angiographic ejection fractions < 55% (sensitivity 82%, specificity 85%). Peak Vcf is an echocardiographic index that can be estimated rapidly and accurately without the need for digitizing equipment and is well suited to general clinical use.