FETAL BREATHING, SLEEP STATE, AND CARDIOVASCULAR-RESPONSES TO ADENOSINE IN SHEEP

被引:66
作者
KOOS, BJ
MATSUDA, K
机构
[1] LOMA LINDA UNIV,SCH MED,DEPT PHYSIOL,DIV PERINATAL BIOL,LOMA LINDA,CA 92354
[2] LOMA LINDA UNIV,SCH MED,DEPT OBSTET & GYNECOL,LOMA LINDA,CA 92354
关键词
blood pressure; brain; fetus; heart rate; hypoxia; respiration; sleep;
D O I
10.1152/jappl.1990.68.2.489
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The possibility that adenosine mediates hypoxic inhibition of fetal breathing and eye movements was tested in nine chronically catheterized fetal sheep (0.8 term). Intracarotid infusion of adenosine (0.25 ± 0.03 mg · min-1 · kg-1) for 1 h to the fetus increased heart rate and hemoglobin concentration but did not significantly affect mean arterial pressure or blood gases. As with hypoxia, adenosine decreased the incidence of rapid eye movements by 55% and the incidence of breathing by 77% without significantly affecting the incidence of low-voltage electrocortical activity. However, with longer (9 h) administration, the incidence of breathing and eye movements returned to normal during the adenosine infusion. Intravenous infusion of theophylline, an adenosine receptor antagonist, prevented most of the reduction in the incidence of breathing and eye movements normally seen during severe hypoxia (Δ arterial PO2 = -10 Torr). It is concluded that 1) adenosine likely depresses fetal breathing and eye movements during hypoxia and 2) downregulation of adenosine receptors may contribute to the adaptation of breathing and eye movements during prolonged hypoxia.
引用
收藏
页码:489 / 495
页数:7
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