CLASSIFICATION OF COUPLING PATTERNS AMONG SPONTANEOUS RHYTHMS AND VENTILATION IN THE SYMPATHETIC DISCHARGE OF DECEREBRATE CATS

Citation
A. Porta et al., CLASSIFICATION OF COUPLING PATTERNS AMONG SPONTANEOUS RHYTHMS AND VENTILATION IN THE SYMPATHETIC DISCHARGE OF DECEREBRATE CATS, Biological cybernetics, 75(2), 1996, pp. 163-172
Citations number
19
Categorie Soggetti
Computer Science Cybernetics","Biology Miscellaneous
Journal title
ISSN journal
03401200
Volume
75
Issue
2
Year of publication
1996
Pages
163 - 172
Database
ISI
SICI code
0340-1200(1996)75:2<163:COCPAS>2.0.ZU;2-A
Abstract
The spontaneous low- and high-frequency rhythms in the sympathetic dis charge of decerebrate artificially ventilated cats are affected by ext ernal ventilation, Two graphical methods (i.e. the space-time separati on plot and the frequency tracking locus) are used to classify the non -linear interactions. The observed behaviours in the sympathetic disch arge consist of phase-locked periodic dynamics (at various frequency r atios with ventilation), quasiperiodic and aperiodic patterns. They de pend on the experimental condition. In control condition the sympathet ic discharge appears more frequently locked to each ventilatory cycle (1:1 dynamics). However, some cases of quasiperiodic dynamics are foun d. A sympathetic activation stimulus, such as inferior vena cava occlu sion, is able to synchronise slow rhythms in the sympathetic discharge to a subharmonic of ventilation. During a sympathetic inhibition stim ulus, such as aortic constriction, 1:1 dynamics is detected but the am plitude of the sympathetic responses can be modulated by unlocked slow rhythms. Moreover, some cases of aperiodic dynamics are observed. Vag otomy reduces the 1:1 coupling between sympathetic outflow and ventila tion. Vagotomy plus spinalisation disrupts periodic dynamics in the sy mpathetic discharge so that irregular and complex patterns are found.