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Titolo:
Impact of acute hypoxia on heart rate and blood pressure variability in conscious dogs
Autore:
Yasuma, F; Hayano, JI;
Indirizzi:
Nagoya Univ, Sch Med, Dept Internal Med 1, Showa Ku, Nagoya, Aichi 4668550, Japan Nagoya Univ Nagoya Aichi Japan 4668550 a Ku, Nagoya, Aichi 4668550, Japan Nagoya City Univ, Sch Med, Dept Internal Med 3, Nagoya, Aichi 4678601, Japan Nagoya City Univ Nagoya Aichi Japan 4678601 Nagoya, Aichi 4678601, Japan
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
fascicolo: 5, volume: 279, anno: 2000,
pagine: H2344 - H2349
SICI:
0363-6135(200011)279:5<H2344:IOAHOH>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYMPATHETIC-NERVE ACTIVITY; RESPIRATORY SINUS ARRHYTHMIA; ARTERIAL-PRESSURE; SPECTRAL-ANALYSIS; CARDIOVASCULAR VARIABILITY; INTERVAL VARIABILITY; COMPLEX DEMODULATION; SLEEPING DOGS; HUMANS; POWER;
Keywords:
sympathetic nervous system; parasympathetic nervous system; trained dog; complex demodulation; respiratory sinus arrhythmia; Mayer waves;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Yasuma, F Nagoya Univ, Sch Med, Dept Internal Med 1, Showa Ku, 65 TsurumaiCho, Nagoya, Aichi 4668550, Japan Nagoya Univ 65 Tsurumai Cho Nagoya AichiJapan 4668550 50, Japan
Citazione:
F. Yasuma e J.I. Hayano, "Impact of acute hypoxia on heart rate and blood pressure variability in conscious dogs", AM J P-HEAR, 279(5), 2000, pp. H2344-H2349

Abstract

To examine whether the impacts of hypoxia on autonomic regulations involvethe phasic modulations as well as tonic controls of cardiovascular variables, heart rate, blood pressure, and their variability during isocapnic progressive hypoxia were analyzed in trained conscious dogs prepared with a permanent tracheostomy and an implanted blood pressure telemetry unit. Data were obtained at baseline and when minute ventilation ((V) over dot I) first reached 10 ((V) over dot I10), 15 ((V) over dot I15), and 20 ((V) over dot I20) 1/min during hypoxia. Time-dependent changes in the amplitudes of the high-frequency component of the R-R interval (RRIHF) and the low-frequency component of mean arterial pressure (MAPLF) were analyzed by complex demodulation. In a total of 47 progressive hypoxic runs in three dogs, RRIHF decreased at (V) over dot I15 and (V) over dot I20 and MAPLF increased at (V) over dot I10 and (V) over dot I15 but not at (V) over dot I20, whereas heartrate and arterial pressure increased progressively with advancing hypoxia. We conclude that the autonomic responses to isocapnic progressive hypoxia involve tonic controls and phasic modulations of cardiovascular variables; the latter may be characterized by a progressive reduction in respiratory vagal modulation of heart rate and a transient augmentation in low-frequencysympathetic modulation of blood pressure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/08/20 alle ore 00:46:41