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portuguesO objetivo deste estudo foi determinar a pressao parcial de dioxido de carbono (PaCO2), pressao ao final da expiracao de CO2 (ETCO2) e diferenca arterio-alveolar de CO2 (Pa-ETCO2) 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), ETCO2, pressao de pico inspiratoria (PIP), pH, pressao parcial arterial de oxigenio (PaO2), PaCO2, excesso de bases (EB) e HCO3 -. Com base nos valores de PaCO2 e ETCO2 encontrados, foi determinada a Pa-ETCO2. Nao foram encontradas diferencas significativas nos valores de PaCO2 entre os grupos VA (42.5±5.2-53,7±5,2) e VP (48.4±5.4 - 55,4±5,7). Todos os grupos apresentaram hipertensao arterial no periodo pos-operatorio. Entretanto, o grupo VP apresentou hipertensao moderada (PAS 150-159mmHg) em comparacao ao grupo CA, que apresentou hipertensao severa (PAS>180 mmHg), sugerindo que tanto a faixa etaria, quanto a execucao de OH por videolaparoscopia, estao associadas a menores taxas de hipertensao pos-operatoria em cadelas. Palavras-chave: pneumoperitonio; videolaparoscopia; hipercapnia; caes; pediatrico EnglishThis paper aimed to determine arterial partial pressure of carbon dioxide (PaCO2), end-expired CO2 pressure (ETCO2), and the difference between arterial and end-expired CO2 pressure (Pa - ETCO2) 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), ETCO2, peak inspiratory pressure (PIP), pH, arterial partial pressure of oxygen (PaO2), PaCO2, base excess (BE) and HCO3 - were measured. Based on the PaCO2 and ETCO2 values, Pa-ETCO2 was determined. There was no significant difference in PaCO2 between the VA (42.5±5.2 to 53.7±5.2) and VP (48.4±5.4 to55.4±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

ciência rural

Changes in arterial partial pressure and end-expired pressure of carbon dioxide in prepubescent and adult bitches undergoing ovariohysterectomy by videolaparoscopy or conventional laparotomy