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Titolo:
Augmentation of respiratory sinus arrhythmia in response to progressive hypercapnia 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: 280, anno: 2001,
pagine: H2336 - H2341
SICI:
0363-6135(200105)280:5<H2336:AORSAI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYMPATHETIC-NERVE ACTIVITY; BLOOD-PRESSURE; HEART-RATE; SPECTRAL-ANALYSIS; CARDIOVASCULAR VARIABILITY; COMPLEX DEMODULATION; SLEEPING DOGS; POWER; INTERVAL; SYSTEM;
Keywords:
autonomic nervous system; heart rate variability; blood pressure; central chemostimulation; complex demodulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
28
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, "Augmentation of respiratory sinus arrhythmia in response to progressive hypercapnia in conscious dogs", AM J P-HEAR, 280(5), 2001, pp. H2336-H2341

Abstract

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 consciousdogs that were prepared with a permanent tracheostomy and an implanted blood pressure telemetry unit. The intensity of RSA was assessed continuously as the amplitude of respiratory fluctuation of heart rate using complex demodulation. In a total of 39 runs of hypercapnia in 3 dogs, RSA increased by38 and 43% of the control level when minute ventilation reached 10 and 15 l/min, respectively (P < 0.0001 for both), and heart rate and mean arterialpressure showed no significant change. The increases in RSA were significant even after adjustment for the effects of increased tidal volume, respiratory rate, and respiratory fluctuation of arterial blood pressure (P < 0.001). These observations indicate that increased RSA during hypercapnia is not the consequence of altered autonomic balance or respiratory patterns and support the hypothesis that RSA is augmented as an active physiological response to hypercapnia.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 07:19:07