Cardiopulmonary effects of reverse Trendelenburg position at 5 degrees and 10 degrees in sevoflurane-anesthetized steers

Autor(es)

Araujo, Marcelo A. ^[1] ; Deschk, Mauricio ^[2] ; Wagatsuma, Juliana T. ^[2] ; Floriano, Beatriz P. ^[2] ; Siqueira, Carlos E. ^[2] ; Oliva, Valeria N. L. S. ^[2] ; Santos, Paulo S. P. ^[2]

Afiliação do(s) autor(es)

^[1] Fed Univ Mato Grosso do Sul UFMS, Fac Vet Med & Anim Sci, Campo Grande, MS - Brazil

^[2] UNESP Sao Paulo State Univ, Fac Vet Med, Dept Anim Clin Surg & Reprod, BR-16050680 Aracatuba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: VETERINARY ANAESTHESIA AND ANALGESIA; v. 44, n. 4, p. 854-864, JUL 2017.
• Citações Web of Science: 1

Resumo

Objective To assess the cardiopulmonary effects caused by reverse Trendelenburg position (RTP) at 5 degrees and 10 degrees in sevoflurane-anesthetized yearling steers. Study design Prospective, experimental study. Animals Eight Holstein steers aged (mean +/- standard deviation) 12 +/- 2 months and weighing 145 +/- 26 kg. Methods In the first phase of the study, the individual minimum alveolar concentration (MAC) of sevoflurane was determined using electrical stimulation. In the second phase, the effects of RTP were assessed. The animals were anesthetized on three separate events separated by >= 7 days in an incomplete crossover design: control treatment using a table without tilt (RTPO); treatment with the table at 5 degrees RTP (RTP5) and table tilted 10 RTP (RTP10). Subjects were physically restrained in dorsal recumbency on the table, which was already tilted according to each treatment. Anesthesia was induced with sevoflurane at 8% in 5 L minute(-1) oxygen via face mask followed by maintenance with sevoflurane at 1.3 MAC and spontaneous breathing. Cardiopulmonary variables were obtained immediately after instrumentation (T-0) and then after 30, 60, 120 and 180 minutes (T-30, T-60, T-120 and T-180, respectively). Results The mean sevoflurane MAC for the eight steers was 2.12 +/- 0.31%. Cardiac output was lower at all time points and the systemic vascular resistance index was higher at T-120 and T-180 in 854 RTP10 compared with RTPO. Oxygen consumption was lower at T-0 and at T-180 in RTP10 compared with RTPO and at all time points except T-30 compared with RTP5. Oxygen extraction was lower at T-0 in RTP10 compared with RTPO and RTP5, and at T-60 and T-180 compared with RTP5. Conclusions and clinical relevance RTP 5 degrees and 10 degrees did not improve ventilatory and oxygenation variables in sevoflurane-anesthetized steers when compared with no tilt, however the cardiovascular variables were adversely affected in RTP10. (AU)

• Processo FAPESP: 13/06046-2 - Efeitos hemodinâmicos e ventilométricos do cefaloaclive em bezerros anestesiados pelo sevofluorano
• Beneficiário: Paulo Sergio Patto dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular