Studio comparativo sull'aritmia respiratoria sinusale: cane, cavallo e uomo a confronto

Pinto, Giulia (2018) Studio comparativo sull'aritmia respiratoria sinusale: cane, cavallo e uomo a confronto. Laurea Magistrale thesis, UNSPECIFIED.

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Tesi di Laurea di Giulia Pinto Matricola 450308.pdf
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Heart rate (FH) accelerates in inspiration and decelerates in expiration, a phenomenon known as Respiratory Sinus Arrhythmia (RSA). Although the presence of RSA has been documented in many species, how its magnitude compares among species is unknown. We asked whether the magnitude of RSA in horses differed from that of dogs and of previously measured humans. From electrocardiogram and pneumography, the peaks and troughs of FH were identified breath-by-breath in five horses and five dogs during resting wakefulness. RSA was computed as the peak-trough FH difference (FH), in percent of mean FH. In horses, RSA averaged 10%±2, ranging from 6% to 15%, quite similar to the mean value in humans (12%±1). Differently, in dogs, RSA averaged 53%±12, with a bimodal distribution peaking at ~25% and ~75%. Comparisons with data reported from other species are complicated by methodological and analytical differences. Nevertheless, from the few cases in which such comparisons were deemed acceptable, it emerged that the magnitude of RSA was body size-independent, despite the fact that some species like the dog may depart greatly from the average inter-species pattern. If confirmed in other species, the body-size independency of RSA may mean that the portion of vagal tone regulated by breathing is important in the coupling of pulmonary blood flow and ventilation, in the effort to optimize gas exchange.

Item Type: Tesi (Laurea Magistrale)
Subjects: Scienze Agrarie e Veterinarie
Dipartimento: Dipartimento di Scienze veterinarie
Depositing User: Mrs Cettina Cosenza
Date Deposited: 31 Jul 2018 08:48
Last Modified: 31 Jul 2018 08:48

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