Differential Effects of Hypoxia and Hypercapnia on Respiratory Sinus Arrhythmia in Conscious Dogs
نویسندگان
چکیده
منابع مشابه
effects of hypoxia and hypercapnia on human hrv and respiratory sinus arrhythmia
purpose: hypercapnia increases minute ventilation (v’e) with little effect on heart rate (hr), whereas hypoxia may increase hr without affecting v’e. however, the effects of hypercapnia and hypoxia on both heart rate variability (hrv) and the clustering of heart beats during spontaneous breathing (respiratory sinus arrhythmia – rsa), are not clear. methods: in this study, 10 human volunteers br...
متن کاملAugmentation of respiratory sinus arrhythmia in response to progressive hypercapnia in conscious dogs.
Respiratory sinus arrhythmia (RSA) may serve to enhance pulmonary gas exchange efficiency by matching pulmonary blood flow with lung volume within each respiratory cycle. We examined the hypothesis that RSA is augmented as an active physiological response to hypercapnia. We measured electrocardiograms and arterial blood pressure during progressive hypercapnia in conscious dogs that were prepare...
متن کاملEffects of hypercapnia and hypoxemia on respiratory sinus arrhythmia in conscious humans during spontaneous respiration.
Normally, at rest, the amplitude of respiratory sinus arrhythmia (RSA) appears to correlate with cardiac vagal tone. However, recent studies showed that, under stress, RSA dissociates from vagal tone, indicating that separate mechanisms might regulate phasic and tonic vagal activity. This dissociation has been linked to the hypothesis that RSA improves pulmonary gas exchange through preferentia...
متن کاملDirect effect of Pa(CO2) on respiratory sinus arrhythmia in conscious humans.
Respiratory sinus arrhythmia (RSA) may improve the efficiency of pulmonary gas exchange by matching the pulmonary blood flow to lung volume during each respiratory cycle. If so, an increased demand for pulmonary gas exchange may enhance RSA magnitude. We therefore tested the hypothesis that CO2 directly affects RSA in conscious humans even when changes in tidal volume (V(T)) and breathing frequ...
متن کاملDiminishment of Respiratory Sinus Arrhythmia
Background. The development of a microcomputer-based device permits quick, simple, and noninvasive quantification of the respiratory sinus arrhythmia (RSA) during quiet breathing. Methods and Results. We prospectively and serially measured the radionuclide left ventricular ejection fraction and the RSA amplitude in 34 cancer patients receiving up to nine monthly bolus treatments with doxorubici...
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ژورنال
عنوان ژورنال: Japanese Circulation Journal
سال: 2001
ISSN: 0047-1828,1347-4839
DOI: 10.1253/jcj.65.738