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Titolo:
RELATION BETWEEN BAROREFLEX SENSITIVITY AND CARDIAC VAGAL TONE IN HUMANS
Autore:
KOLLAI M; JOKKEL G; BONYHAY I; TOMCSANYI J; NASZLADY A;
Indirizzi:
SEMMELWEIS UNIV MED,INST PHYSIOL 2,EXPTL RES DEPT,ULLOI UT 78-A H-1082 BUDAPEST HUNGARY NATL KORANYI INST,DEPT CARDIOL H-1082 BUDAPEST HUNGARY
Titolo Testata:
The American journal of physiology
fascicolo: 1, volume: 266, anno: 1994,
parte:, 2
pagine: 80000021 - 80000027
SICI:
0002-9513(1994)266:1<80000021:RBBSAC>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE; PARASYMPATHETIC CONTROL; BARORECEPTOR REFLEXES; ARTERIAL-PRESSURE; SINUS ARRHYTHMIA; RESPONSES; HYPOXIA; HYPERCAPNIA; MODULATION; DOGS;
Keywords:
HEART; AUTONOMIC; ARTERIAL BARORECEPTORS; BAROREFLEX THRESHOLD; ATROPINE; NITROGLYCERIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M. Kollai et al., "RELATION BETWEEN BAROREFLEX SENSITIVITY AND CARDIAC VAGAL TONE IN HUMANS", The American journal of physiology, 266(1), 1994, pp. 80000021-80000027

Abstract

The extent of dependence of cardiac vagal tone on arterial baroreceptor input has been studied in 12 healthy, young adult subjects. Cardiacvagal tone was defined as the change in R-R interval after complete cholinergic blockade by atropine. Baroreflex sensitivity was determinedwith the ''Oxford-method'': R-R interval was regressed against systolic pressure. The interindividual correlation between cardiac vagal tone and baroreflex sensitivity for falling pressures was found to be significant, but not close (R = 0.81, P = 0.002). In each subject, the baroreflex regression line for falling pressures was extrapolated to thepostatropine R-R interval level; 50 mmHg was considered as minimum and 80 mmHg as maximum threshold level for the integrated baroreflex. From the relation between the individual regression lines and the minimum and maximum threshold levels, it was concluded that cardiac vagal tone could be generated by both baroreflex-dependent and -independent mechanisms, the ratio of which varies in different individuals, with thebaroreflex-dependent mechanism being the dominant factor.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 14:47:29