Thoracoabdominal motion during progressive isocapnic hypoxia in conscious man.
نویسندگان
چکیده
منابع مشابه
Effect of isocapnic hypoxia on systolic time intervals in conscious man.
The effects of progressive isocapnic hypoxia on the systolic time intervals were studied in 10 healthy human subjects. We induced hypoxia by a rebreathing method and monitored the arterial oxygen saturation continuously and non-invasively by means of an ear oximeter. Arterial oxygen saturation (SaO2) was allowed to fall to a level of 75 per cent and was then held constant for five minutes. As S...
متن کاملEffects of haloperidol on ventilation during isocapnic hypoxia in humans.
Exposure to isocapnic hypoxia produces an abrupt increase in ventilation [acute hypoxic ventilatory response (AHVR)], which is followed by a subsequent decline [hypoxic ventilatory depression or decline (HVD)]. In cats, both anesthetized and awake, haloperidol has been reported to increase AHVR and almost entirely abolish HVD. To investigate whether this occurs in humans, the ventilatory respon...
متن کاملIsocapnic and small hypercapnic single-breath stimuli: evidence for an inhibitory inflation reflex in conscious man.
We wished to find out if a deep inspiration had any influence on subsequent breathing which was mediated by neural rather than chemical stimuli. We therefore compared the effect on ventilation of a deep isocapnic breath with that of a similar breath containing 6% CO2, and with the effect of two successive tidal volume breaths of 6% CO2. We studied five normal subjects, each of whom repeated the...
متن کاملEffectiveness of venous oxygenation during progressive hypoxia.
This study was undertaken to assess the effect of extracorporeal oxygenation on the heart and on gas exchange. In acute experiments on anesthetized, closedchest greyhounds, venovenous shunting under pulsatile pressure did not affect heart rate, cardiac output or arterial blood pressure. Then progressive hypoxia was produced by hypoventilation and the venous oxygen tension was raised by mechanic...
متن کاملChanges in respiratory control during and after 48 h of isocapnic and poikilocapnic hypoxia in humans.
Ventilatory acclimatization to hypoxia is associated with an increase in ventilation under conditions of acute hyperoxia (VEhyperoxia) and an increase in acute hypoxic ventilatory response (AHVR). This study compares 48-h exposures to isocapnic hypoxia (protocol I) with 48-h exposures to poikilocapnic hypoxia (protocol P) in 10 subjects to assess the importance of hypocapnic alkalosis in genera...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1984
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1984.sp015143