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Titolo:
Detection and sources of nonlinearity in the variability of cardiac R-R intervals and blood pressure in rats
Autore:
Gonzalez, JJ; Cordero, JJ; Feria, M; Pereda, E;
Indirizzi:
Univ La Laguna, Fac Med, Dept Fisiol, Lab Biofis, E-38320 Tenerife, Spain Univ La Laguna Tenerife Spain E-38320 ab Biofis, E-38320 Tenerife, Spain Univ La Laguna, Fac Med, Dept Pharmacol, E-38320 Tenerife, Spain Univ La Laguna Tenerife Spain E-38320 Pharmacol, E-38320 Tenerife, Spain
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
fascicolo: 6, volume: 279, anno: 2000,
pagine: H3040 - H3046
SICI:
0363-6135(200012)279:6<H3040:DASONI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE-VARIABILITY; TIME-SERIES DATA; SHORT-TERM; SURROGATE DATA; CHAOS; DYNAMICS; OSCILLATIONS; PREDICTION; DIMENSION; SEQUENCES;
Keywords:
cardiovascular variability; autonomic nervous system; recurrent quantification analysis; nonlinear analysis; surrogate test;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Gonzalez, JJ Univ La Laguna, Fac Med, Dept Fisiol, Lab Biofis, E-38320 Tenerife, Spain Univ La Laguna Tenerife Spain E-38320 38320 Tenerife, Spain
Citazione:
J.J. Gonzalez et al., "Detection and sources of nonlinearity in the variability of cardiac R-R intervals and blood pressure in rats", AM J P-HEAR, 279(6), 2000, pp. H3040-H3046

Abstract

Beat-to-beat R-R interval (RRV) and systolic blood pressure (SPV) variability signals were obtained from unrestrained rats in baseline and under different pharmacological treatments. The origin and extent of the nonlinearityin both signals, as well as their degree of mutual coupling, was estimatedusing measurements from the correlation integral (CI) and recurrence quantification analysis (RQA). After the respiratory component of baseline signals was removed, the nonlinearity was lower in the RRV and disappeared in the SPV. This also decreased the RRV-SPV coupling. The nonlinearity of RRV was also reduced after atropine, and the nonlinearity of SPV was strengthenedafter prazosin and N-omega-monomethyl-L-arginine (L-NMMA). Atropine and prazosin decreased CI measures of both signals, whereas propranolol, phenylephrine, and L-NMMA decreased only those of SPV. RQA indexes of RRV increasedafter atropine and decreased after propranolol, whereas the reverse occurred for the RRV-SPV coupling. These results suggest that: 1) the nonlinearity of RRV appears to be very dependent on the parasympathetic activity, whereas that of SPV seems to come from its respiratory component through a nonneural pathway; 2) respiratory component appears to be involved, through theparasympathetic system, in the RRV-SPV coupling; and 3) CI and RQA measures seems to be useful in assessing autonomic mediation of RRV and RRV-SPV coupling.

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Documento generato il 10/07/20 alle ore 02:44:21