The aim of the present study was to investigate by means of cardiac catheterizatton the respiratory changes of right auricular pressure, right ventricular pressure and of pulmonary arterial pressure in three groups. Data were obtained from 4 normal subjects, 6 cases of moderately advanced tuberculosis and 6 cases of unilateral inexpansible lung complicated with artificial pneumothorax. During the cardiac catheterization, subjects were instructed to make deep respirations. Respirations were recorded by means of pneumograph. Pressure value at the last heart beat of expiratory phase were chosen as the control level.
1. Right auricular pressure in normal subjects was similar to respiratory tracing. In moderately advanced tuberculosis, result was similar to that of normal individuals. In 2 of unilateral inexpansible lung cases, the pressure decreased during early phases of inspirations only.
2. Right ventricular pressure in normal subjects was approximately similar to respiratory tracing. In moderately advanced TB, the systolic pressure elevated slightly at the end of inspiratory phase. Among unilateral inexpansible lung cases, in which contralateral lungs had extensive scattered lesions and absorption from distentions emphysema, the systolic pressure elevated remarkably at the early phase of inspiration.
3. As for pulmonary arterial pressure of normal individuals, the systolic pressure showed slow elevation during late phase of inspiration. In the moderately advanced TB, in cases which had extensive lesions the pulmonary arterial pressure of normal side was similar to that of healthy subjects, however, in the diseased side both systolic and diastolic pressures elevated at the early phase of inspiration. In diseased side, both systolic and diastolic pressures of unilateral inexpansible lung decreased at the early phase of inspiration and did not elevated at the final phase of inspiration.
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