[The spectrogram of heart rate in cats following burst stimulation of the vagus nerve].
Denervation of the heart (bilateral vagotomy and propranolol) in artificially ventilated cats didn't remove respiratory peaks on the spectrogram of heart rate, while burst stimulation of vagus nerve increased or decreased them several times by synchronization of the heart and vagus rhythms, which in its turn was observed under the bradycardia only. At the same time, the desynchronization of rhythms provoked severe sinus arrhythmia which had a distinct periodic character. Under these conditions, there were high non-respiratory peaks appearing at the spectrogram of the heart rate that indicated existence of two vagus chronotropic effects: a well known tonic one and special intracycle synchronizing effect correcting duration of every cardiac cycle.
Sheĭkh-Zade
Iu R
IuR
Mukhambetaliev
G Kh
GKh
Cherednik
I L
IL
D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000494:pharmacology; D017763:Autonomic Denervation; D002415:Cats; D004562:Electrocardiography; D006321:Heart / Q000187:drug effects / Q000294:innervation*; D006339:Heart Rate / Q000187:drug effects / Q000502:physiology*; D011433:Propranolol / Q000494:pharmacology; D014630:Vagus Nerve / Q000187:drug effects / Q000502:physiology* / Q000601:surgery
D000889:Anti-Arrhythmia Agents; D011433:Propranolol