Chronic intermittent hypoxia increases haematocrit and causes right ventricular hypertrophy in the rat

被引:62
作者
McGuire, M [1 ]
Bradford, A [1 ]
机构
[1] Royal Coll Surg Ireland, Dept Physiol, Dublin 2, Ireland
来源
RESPIRATION PHYSIOLOGY | 1999年 / 117卷 / 01期
基金
英国惠康基金;
关键词
heart; mass; intermittent hypoxia; hematocrit; hypoxia; intermittent; right ventricle; mammals; rat; sleep apnea;
D O I
10.1016/S0034-5687(99)00047-X
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Chronic continuous hypoxia increases haematocrit and causes right ventricular hypertrophy and pulmonary hypertension. In obstructive sleep apnoea, the exposure to hypoxia is intermittent rather than continuous but the effects of chronic intermittent hypoxia on haematocrit and right ventricular mass are unclear. Wistar rats were exposed to alternating periods of hypoxia and normoxia twice per min for 8 h per day for 5 weeks in order to mimic the intermittent hypoxia of obstructive sleep apnoea in humans. Haematocrit was significantly raised at day 7, 14, 21, 28 and 35 of the treatment period. At the end of the treatment, there was a significant increase in right ventricular mass. Therefore, chronic intermittent hypoxia increases haematocrit and right heart mass. These results suggest that the raised haematocrit and pulmonary arterial pressure observed in some cases of obstructive sleep apnoea in humans may be caused by intermittent nocturnal hypoxaemia. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:53 / 58
页数:6
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