Modulations of human autonomic function induced by positive pressure-assisted breathing

Summary In order to examine the acute autonomic response in humans during and immediately after positive pressure‐assisted (PPA) breathing, spontaneous cardiac baroreflex (BR) sensitivity was studied through the adaptation of consecutive RR intervals in response to spontaneous systolic blood pressur...

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Published in:Clinical physiology and functional imaging 2006-01, Vol.26 (1), p.15-20
Main Authors: Garet, Martin, Barthélémy, Jean-Claude, Degache, Francis, Pichot, Vincent, Duverney, David, Roche, Frédéric
Format: Article
Language:English
Subjects:
Adult
autonomic nervous system
Autonomic Nervous System - physiology
Baroreflex - physiology
Biological and medical sciences
Blood Pressure - physiology
Blood vessels and receptors
cardiac baroreflex sensitivity
Electrocardiography
Female
Fundamental and applied biological sciences. Psychology
Heart Rate - physiology
heart rate variability
Humans
Male
positive airway pressure
Positive-Pressure Respiration
ventilation
Vertebrates: cardiovascular system
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creator Garet, Martin
Barthélémy, Jean-Claude
Degache, Francis
Pichot, Vincent
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Roche, Frédéric
description Summary In order to examine the acute autonomic response in humans during and immediately after positive pressure‐assisted (PPA) breathing, spontaneous cardiac baroreflex (BR) sensitivity was studied through the adaptation of consecutive RR intervals in response to spontaneous systolic blood pressure fluctuations in 11 healthy subjects. The gain (α‐index) in baroreceptor reflex was estimated using cross‐spectral analysis (RR interval variability and systolic blood pressure variability) for the low frequency (LF) and high frequency (HF) bands. All measurements were made under fixed breathing rate (12 breaths per minute), and realized consecutively at baseline level (20 min), after‐short inspiratory pressure support plus positive end‐expiratory airway pressure (IPS + PEEP) ventilation (15 min), again under normal conditions (20 min; recovery period) and, finally, during a standard upward orthostatic challenge test (15 min; orthostatic challenge). The spontaneous BR gain in the HF band increases slightly during ventilation (+26·1 ± 11·7%, P
doi_str_mv 10.1111/j.1475-097X.2005.00645.x
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The gain (α‐index) in baroreceptor reflex was estimated using cross‐spectral analysis (RR interval variability and systolic blood pressure variability) for the low frequency (LF) and high frequency (HF) bands. All measurements were made under fixed breathing rate (12 breaths per minute), and realized consecutively at baseline level (20 min), after‐short inspiratory pressure support plus positive end‐expiratory airway pressure (IPS + PEEP) ventilation (15 min), again under normal conditions (20 min; recovery period) and, finally, during a standard upward orthostatic challenge test (15 min; orthostatic challenge). The spontaneous BR gain in the HF band increases slightly during ventilation (+26·1 ± 11·7%, P&lt;0·05) and decreases significantly during recovery without any significant alteration in mean heart rate, systolic or diastolic blood pressure. The spontaneous BR gain in the LF band decreases during IPS + PEEP ventilation (8·4 ± 4·4 versus 12·7 ± 6·2 ms mm−1 Hg; P&lt;0·05) and returns to basal level during recovery. Orthostatic challenge altered significantly the BR gain in both HF and LF bands with significant heart rate acceleration. 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The spontaneous BR gain in the LF band decreases during IPS + PEEP ventilation (8·4 ± 4·4 versus 12·7 ± 6·2 ms mm−1 Hg; P&lt;0·05) and returns to basal level during recovery. Orthostatic challenge altered significantly the BR gain in both HF and LF bands with significant heart rate acceleration. In humans, while the parasympathetic control of heart rate and blood pressure is found moderately enhanced, the sympathetic BR drive appears significantly and transitory altered under short term IPS + PEEP ventilation with a degree of alteration comparable to those observed during orthostatic challenge.</abstract><cop>Oxford, UK</cop><pub>Blackwell Science Ltd</pub><pmid>16398665</pmid><doi>10.1111/j.1475-097X.2005.00645.x</doi><tpages>6</tpages></addata></record>
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1475-097X
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source Wiley
subjects Adult
autonomic nervous system
Autonomic Nervous System - physiology
Baroreflex - physiology
Biological and medical sciences
Blood Pressure - physiology
Blood vessels and receptors
cardiac baroreflex sensitivity
Electrocardiography
Female
Fundamental and applied biological sciences. Psychology
Heart Rate - physiology
heart rate variability
Humans
Male
positive airway pressure
Positive-Pressure Respiration
ventilation
Vertebrates: cardiovascular system
title Modulations of human autonomic function induced by positive pressure-assisted breathing
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