KCI등재후보
도립(-6。)에 의한 심장혈관계 및 혈중 Catecholamine농도의 조기 변화 = Initial Changes of Hemodynamics and Plasma Catecholamine Levels during -6。 Head-Down Tilt
저자
채의업 (계명대학교 의과대학 생리학교실) ; 배재훈 (계명대학교 의과대학 생리학교실) ; 현정애 (계명대학교 의과대학 생리학교실)
발행기관
啓明大學校 醫科大學(Keimyung University School of Medicine & Institute for Medical Science)
학술지명
권호사항
발행연도
1991
작성언어
Korean
주제어
KDC
510.5
등재정보
KCI등재후보
자료형태
학술저널
수록면
28-43(16쪽)
제공처
소장기관
Head-down tilt at -6℃ has been used as an experimuntal model to evaluate the effect on hemodynamics by movemunt of blood toward the central portion of the body under the conditions of weightlessness. So far there are a few disagreements between the findings reported by the different authors about early hemodynamic effects of heas-down tilt.
Therefore, this study was done for the purpose to determine the early changes of hemodynamics and plasma catecholamine levels at head-down tilt from the prone position, which is more familiar than the supine position in the dog. Ten mongrel dogs weighing 8-12kg were anesthetized with the intravenous infusion of nembutal(30mg/kg), and the electromagnetic flow transducers were set up on the left common carotid and the right femoral artery to measure blood flow. Arterial pressure was measured directly by the strain gauge pressure transducer. Heart rate and respiratory rate, and pH, Po2, Pco2 and hematocrit of arterial and venous blood were also measured. The concentration of plasma epinephrine and norepinephrine was determined by Peuler and Johnson's radioenzymatic method.
The postural changes were performe from the supine to the prone position, from the prone to the head-down position, and then to the prone position after head-down tilt and each posture was maintained for 30 minutes. The results are summarized as follows:
When the posture was changed from the supine to the prone position, mean arterical pressure, heart rate, respiratory rate, blood flow of common carotid artery and plasma epinephrine level were increased, and blood, flow of femoral artery was decreased.
Tilting to the head-down position from the prone position, arterial pressure was increased initially and maintained thereafter, and heart rate was slightly decreased and then gradually increased. Blood flow of common carotid artery was revealed a persistent increase, but that of femoral artery was not significantly changed. The change of carotid peripheral artery resistance was not significant, and femoral peripheral artery resistance was slightly increased, and respiratory rate was increased.
At 30 minitues of head-down tilt, plasma norepinephrine level was slightly decreased and epinephrine level was increased.
In the early phase of the recovery prone position after head-down tilt, arterial pressure and heart rate were significantly(p<0.01) increased comparing to the values at the end of the head-down tilt, and the higher arterial pressure was shown persistently during the recovery prone position. The changes of blood flow of common carotid artery and carotid peripheral artery resistance were not significant, but in the femoral artery, blood flow was decreased and femoral peripheral artery resistance was increased. Respiratory rate was not significantly changed.
At 30 minutes of the recovery prone position after head-down tilt, plasma norepinephrine level was increased and plasma epinphrine level was significantly(p<0.05) increased comparing to the values at the end of head-down tilt.
Through the periods of the serial postural changes, the changes of pH of arterial and venous blood were not significant, and gradual increase of Po2 and on the contrary gradual decrease of Pco2 wer revealed, their hematocrit were increased since 30 minutes of head-down tilt.
In conclusion, when the posture is changed from the supine to the position, the heart rate is significantly increase and the other changes of cardiovascular systems are not significant.
At the early stage of head-down tilt, the heart rate is transiently decreased and it is suggestive that cardiopulmonary baroreceptor is adequately operated according th the increased venous return from the lower body, however the arterial pressure and the blood flow of common carotid artery are increased thereafter.
The significant rise of arterial perssure and heart rate in the recovery prone position after head-down tilt may be a result of the pressor reflex by the cardiopulmonary baroreceptor according to the diminution of a hydrostatic pressure produced by the head-down tilt, which is evidenced by an elevation of the plasma catecholamine levels.
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