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The ejection fraction of the left ventricle was determined by videodensitometry in 121 patients with angina pectoris. The mean value was 31 per cent. This estimation, which is easily performed by the method described, gives important and accurate information on the left ventricular function which, added to other parameters, should increase the reliability of the clinical evaluation of the patient.

The videodensitometer has been used in a group of 20 patients with aortic incompetence and incompetence combined with stenosis. The method appears effective in the preoperative evaluation of the valvular and ventricular function of the patient. It gives objective and probably more accurate information of the regurgitation fraction and the ejection fraction than the commonly used semiquantitative methods. The method is simple to use and needs no technical changes in the roentgen equipment.