American journal of physiology . ometer simultaneouslyto the ventricle, and the long cannula is used only in experimentswhere it is desired to study the pressure changes in the closedchest. Right auricular pressure was, as a rule, read by a water ma-nometer introduced through the jugular vein. Carotid or pulmo-nary arterial pressures were simultaneously recorded in selectedexperiments. III. Types of Intraventricular Pressure Curves and their Determining Factors - The Normal Curve. — An intraventricular pressure curve,obtained when right auricular pressure and pulmonary arterial 388 Carl J. Wig
American journal of physiology . ometer simultaneouslyto the ventricle, and the long cannula is used only in experimentswhere it is desired to study the pressure changes in the closedchest. Right auricular pressure was, as a rule, read by a water ma-nometer introduced through the jugular vein. Carotid or pulmo-nary arterial pressures were simultaneously recorded in selectedexperiments. III. Types of Intraventricular Pressure Curves and their Determining Factors - The Normal Curve. — An intraventricular pressure curve,obtained when right auricular pressure and pulmonary arterial 388 Carl J. Wiggers pressure are approximately those found in naturally breathinganimals, may be regarded as a normal type in open chest experi-ments. An effective auricular pressure of 45-50 mm. of waterand a mean pulmonary arterial pressure of 18 mm. Hg may beregarded as normal averages. In eleven experiments, such pressure combinations were ob-tained by a low degree of pulmonary ventilation. A few typicalwaves are shown in Fig. 3. Carotid.
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