Studies on Right Ventricular Overloading During Induced Anoxia with the Use of Double Lumen Catheter : Symposium on Intravascular Catheterization

Abstract

A double lumen catheter was employed to examine the hemodynamics of the right heart. Also, the factors which cause pulmonary hypertension in anoxia were determined. The relation between the heart sound and the intersecting point of the ventricular and arterial pressure curves were that the second sound and the closing point of the pressure curve coincide well, but the first sound did not coincide well with the opening point of the curve probably because interference of sounds due to blood flow, myocardial vibration etc. When the pulmonary artery pressure rises (this includes the condition during induced anoxia) the effective expulsion time of the right ventricle shortens and the ventricle is forced to expell a certain amount of blood within a short time. In cases with no obstruction in blood flow, the pressure difference between the systolic right ventricular and pulmonary pressures decreases as the mean pulmonary arterial pressure rises. Thus, in combination with the fact noted in the above section, the right ventricle is placed in a state of an increased pressure load. When this state becomes more severe, the possible occurrence of right ventricular insufficiency can be predicted. This paper was made possible with the cooperation of Drs. Shinji WATANABE, H. YOSHINAKA, K. YAZU, R. YAZIMA, K. NARIYAMA, K. ASAKUMA, I. SUEMITSU, Shigeki WATANABE and T. OKUl.