Efeitos de duas doses de morfina associada ao midazolam em pombos domésticos (Columba livia), sob anestesia geral com isoflurano e submetidos à osteossíntese de úmero

Abstract

As in mammals, preemptive and balanced analgesia concepts can be applied to avian. Cardiovascular and respiratory effects using preanesthetic protocol (MPA) with 1mg/Kg (M1) or 3 mg/Kg (M3) of morphine with 1 mg/Kg of midazolam were assessed in 14 racing pigeons anesthetized with isoflurane and summited to orthopedic surgery. The physiological parameters as heart rate (FC), respiratory rate (f), systolic arterial pressure (PAS), body temperature (TC), end-expired carbon dioxide tension (ETCO2) and haemoglobin oxygen saturation (SatO2) were assessed before MPA (T0), 15 minutes after its application (T1), 5 minutes after anesthetic induction (T2); and in different surgical times (T3, T4, T5, T6 e T7). The increase of morphine doses did not affect the cardiorespiratory parameters in a significant way between the groups. Both groups showed lower values of FC and f, only when comparted to baseline values of each group (p<0,005). Others punctual changes were the reduction (p<0,001) of PAS in T6 of GM3 and the increase of ETCO2 in T2 of GM1. In conclusion, both protocols can be used safely as they have minimum effects on the cardiorespiratory system.