DETERMINATION OF THE TRUE SIZE OF THE CORONARY ARTERY IN CORONARY ARTERIOGRAPHY

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Abstract
The hemodynamic assessment of coronary artery stenoses on coronary arteriograms is difficult unless delayed opacification or collaterals are demonstrated. Expressing the degree of narrowing in percentage may be disadvantageous, since disease segments are compared with more or less stenotic segments. This system is particularly inaccurate in the 3+ category (51 to 99 per cent) which is of particular interest to the cardiologists and operating surgeon. Exact measurement of the coronary artery proximal and distal to the stenosis as well as measurement of the stenosis in width and length may be more hemodynamically meaningful. A simple conversion table allows computation of actual coronary artery size with high accuracy, taking into consideration various magnification factors. These tables are particularly useful in film recording of coronary arteriograms, since cine coronary arteriography lacks definition and does not lend itself to measurements as readily.*

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