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V ARIOUS methods have been devised by others for estimating the weight of the normal heart in man by relating heart wveight to body size and age.'1-3 In other studies the weight of the left ventricle has been compared to total heart weight in postmortem hearts.' Smith's method for estimating the normal left ventricular mass has been utilized by Bing for(More)
• In previous studies from this and other laboratories, rapid biplane angiocardiography has been utilized to quantify left ventricular chamber volume and volume changes in man and experimental animals." Arvidsson measured left ventricular stroke volume in several subjects with valvular heart disease in the course of extensive studies on left atrial volume(More)
BACKGROUND The effect of health education provided by teachers, in three primary schools of Guerrero, Mexico, on the prevalence of head louse infestation was compared. METHODS A cross-sectional survey and rapid appraisal methods were performed, including a child questionnaire and qualitative data from teachers and focus groups of mothers in the same(More)
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