A method of left ventricular ejection fraction estimation from cineangiocardiograms employing a special-purpose calculator

Cardiovascular Research
P J Bones, H Ikram


A special-purpose calculator is described which computes the left ventricular ejection fraction and end-diastolic volume (and thus stroke and end-systolic volumes) from single-plane cineangiocardiograms. A pair of manual callipers is used to convert the length information of angiographic projections into digital form for processing by the calculator. Volumes are estimated by means of a first order numerical integration method assuming circular cross-section. The angiograms of 42 patients were analysed using both the calculator and a conventional method. The results of the 2 methods correlated very closely (r = 0.99) with a slope within 1% of unity. The calculator is suggested as a practical and cheaper alternative to computer-based systems.

Related Concepts

Cardiac Output
Computers, Digital
Left Ventricular Structure
Study, Methodological
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