Changes in arterial partial pressure and end-expired pressure of carbon dioxide in prepubescent and adult bitches undergoing ovariohysterectomy by videolaparoscopy or conventional laparotomy/Variacoes nas pressoes parciais arteriais e expiradas de dioxido de carbono em cadelas pre-puberes e adultas submetidas a ovario histerectomia video laparoscopica ou convencional

This paper aimed to determine arterial partial pressure of carbon dioxide (PaCO), end-expired C[O.sub.2] pressure (ETCOJ, and the difference between arterial and end-expired C[O.sub.2] pressure (Pa - ETCO) in prepubescent and adult bitches undergoing videolaparoscopic or conventional ovariohyterectomy (OH). Forty bitches were randomly assigned to four groups: Conventional Adult (CA), Conventional Pediatric (CP), Videolaparoscopic Adult (VA) and Videolaparoscopic Pediatric (VP). Pulse rate (PR), respiratory rate (RR), systolic, mean, and diastolic arterial pressures (SAP, MAP, DAP), ETC[O.sub.2], peak inspiratory pressure (PIP), pH, arterial partial pressure of oxygen (Pa[O.sub.2]), PaC[O.sub.2], base excess (BE) and HC[O.sub.3.sup.-] were measured. Based on the PaC[O.sub.2] and ETC[O.sub.2] values, Pa-ETC[O.sub.2] was determined. There was no significant difference in PaC[O.sub.2] between the VA (42.5 [+ or -] 5.2 to 53.7 [+ or -] 5.2) and VP (48.4 [+ or -] 5.4 to 55.4 [+ or -] 5.7) groups. During the postoperative period, all groups presented with hypertension. However, mild hypertension (SAP 150 to 159mmHg) was observed in the VP group as compared to severe hypertension (SAP>180mmHg) in the CA group, suggesting that both the age range and videolaparoscopic OH are associated with lower levels of hypertension during the postoperative period in dogs. Key words: pneumoperitony, videolaparoscopy, hypercapnia, dogs, pediatric. O objetivo deste estudo foi determinar a pressao parcial de dioxido de carbono (PaCOJ, pressao ao final da expiracao de C[O.sub.2] (ETCOJ e diferenca arterio-alveolar de C[O.sub.2] (Pa-ETCOJ em cadelas pre-puberes e adultas submetidas a ovario-histerectomia (OH) videolaparoscopica ou convencional. Foram distribuidas 40 cadelas em quatro grupos: Convencional Adulto (CA), Convencional Pediatrico (CP), Videolaparoscopico Adulto (VA) e Videolaparoscopico Pediatrico (VP). Foram mensurados frequencia de pulso (FP), frequencia respiratoria (FR), pressoes arteriais sistolica (PAS), media (PAM) e diastolica (PAD), ETC[O.sub.2], pressao de pico inspiratoria (PIP), pH, pressao parcial arterial de oxigenio (PaO) PaC[O.sub.2], excesso de bases (EB) e HC[O.sub.3.sup.-]. Com base nos valores de PaC[O.sub.2] e ETC[O.sub.2] encontrados, foi determinada a Pa-ETC[O.sub.2]. Nao foram encontradas diferencas significativas nos valores de PaC[O.sub.2] entre os grupos VA (42.5 [+ or -] 5.2-53,7 [+ or -] 5,2) e VP (48.4 [+ or -] 5.4 - 55,4 [+ or -] 5,7). Todos o