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THE DIRECT METHOD FOR DETERMINING THE CARDIAC
METHODS BASED ON THE USE OF A FOREIGN Gas
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accompanied acetylene action activity alveolar amount animals application arterial arterio-venous oxygen difference attributed average basal bath blood flow blood pressure body breathing carbon dioxide cardiac output cause changes Chapter circulation circulatory circulatory system clinical compared complete considerable considered constant cubic centimeters decrease demonstrated described determinations determining the cardiac diastolic digitalis disease drug effect error exercise expected experimental experiments fact factors Figure functions give given greater heart hence increase indicate ingestion injection insufficiency liters lungs marked measure mechanism metabolism method minute mixture muscular necessary normal normal individuals observed obtained occur organism oxygen consumption patients percent period physiological possible present probably procedure psychic pulse rate reaction rebreathing response rest rise samples seen shown slight studies systolic output Table temperature tension tion tissues usually utilization values variation various vary volume