Abstract
The author have studied the significance of the "wedge pressure" in the cardiac catheterization of dogs.1) The experimental pulmonary arterial hypertension induced by pulmonary embolism does not accompany pulmonary arterial wedge pressure elevation.2) At the normal lung, contour of pulmonary venous wedge pressure showes typical arterial pressure contour, in contradiction to this, pulmonary arterial wedge pressure contour showes venous pressure contour. The pressure difference between them are averaging at 4.8 mHg.3) In the ventricular premature beats, which fails atrial contraction, pulmonary arterial wedge pressure contour showes n oa-wave and chiefly composed by v-wave.4) According to these datas, the author have set a shema, which explaines that the pulmonary arterial wedge pressure is idential with pulmonary venular pressure and the pulmonary venous wedge pressure with pulmonary arterial pressure. According to the former concept of "velocity factor" the author have calculated the pressure difference between the pulmonary arterial wedge pressure and the pulmonary venous wedge pressure as less than 0.58 mHg, which is far small as to explain practical difference of 4.8 mHg.
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