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Carotid body potentiation during chronic intermittent hypoxia: Implication for hypertension

dc.contributor.authorDel Rio R.
dc.contributor.authorMoya E.A.
dc.contributor.authorIturriaga R.
dc.date.accessioned2020-09-02T22:16:14Z
dc.date.available2020-09-02T22:16:14Z
dc.date.issued2014
dc.identifier10.3389/fphys.2014.00434
dc.identifier.citation5, Nov, -
dc.identifier.issn1664042X
dc.identifier.urihttps://hdl.handle.net/20.500.12728/4247
dc.descriptionAutonomic dysfunction is involved in the development of hypertension in humans with obstructive sleep apnea, and animals exposed to chronic intermittent hypoxia (CIH). It has been proposed that a crucial step in the development of the hypertension is the potentiation of the carotid body (CB) chemosensory responses to hypoxia, but the temporal progression of the CB chemosensory, autonomic and hypertensive changes induced by CIH are not known. We tested the hypothesis that CB potentiation precedes the autonomic imbalance and the hypertension in rats exposed to CIH. Thus, we studied the changes in CB chemosensory and ventilatory responsiveness to hypoxia, the spontaneous baroreflex sensitivity (BRS), heart rate variability (HRV) and arterial blood pressure in pentobarbital anesthetized rats exposed to CIH for 7, 14, and 21 days. After 7 days of CIH, CB chemosensory and ventilatory responses to hypoxia were enhanced, while BRS was significantly reduced by 2-fold in CIH-rats compared to sham-rats. These alterations persisted until 21 days of CIH. After 14 days, CIH shifted the HRV power spectra suggesting a predominance of sympathetic over parasympathetic tone. In contrast, hypertension was found after 21 days of CIH. Concomitant changes between the gain of spectral HRV, BRS, and ventilatory hypoxic chemoreflex showed that the CIH-induced BRS attenuation preceded the HRV changes. CIH induced a simultaneous decrease of the BRS gain along with an increase of the hypoxic ventilatory gain. Present results show that CIH-induced persistent hypertension was preceded by early changes in CB chemosensory control of cardiorespiratory and autonomic function. © 2014 Del Rio, Moya and Iturriaga.
dc.language.isoen
dc.publisherFrontiers Research Foundation
dc.subjectAutonomic imbalance
dc.subjectCarotid body
dc.subjectHypertension
dc.subjectIntermittent hypoxia
dc.subjectpentobarbital
dc.subjectanimal experiment
dc.subjectarterial pressure
dc.subjectArticle
dc.subjectautonomic dysfunction
dc.subjectcarotid body
dc.subjectchemoreceptor reflex
dc.subjectchronic intermittent hypoxia
dc.subjectcontrolled study
dc.subjectheart rate variability
dc.subjecthypertension
dc.subjectmale
dc.subjectnonhuman
dc.subjectparasympathetic tone
dc.subjectpathophysiology
dc.subjectpressoreceptor reflex
dc.subjectrat
dc.subjectspontaneous baroreflex sensitivity
dc.subjectsympathetic tone
dc.subjectventilatory hypoxic chemoreflex
dc.titleCarotid body potentiation during chronic intermittent hypoxia: Implication for hypertension
dc.typeArticle


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