Influence of capnoperitoneum on intraocular pressure in spontaneously breathing dogs undergoing ovariectomy

https://doi.org/10.17221/89/2017-VETMEDCitation:Rauser P, Mrazova M, Crha M, Urbanova L, Vychodilova M (2017): Influence of capnoperitoneum on intraocular pressure in spontaneously breathing dogs undergoing ovariectomy. Veterinarni Medicina, 62: 661-667.
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The objective of this study was to evaluate potential changes in intraocular pressure in spontaneously breathing dogs undergoing laparoscopic ovariectomy with capnoperitoneum. Twenty bitches undergoing laparoscopic ovariectomy were enrolled in a prospective clinical trial. The dogs were under general anaesthesia and were breathing spontaneously throughout the entire period of the procedure. Capnoperitoneum was then established with an intra-abdominal pressure setting of 10 mmHg. Collected data included intraocular pressure, pupil size, heart rate, respiratory frequency, systolic and diastolic arterial pressure, end-tidal CO2, oxygen saturation of haemoglobin and tidal volume. Data were recorded 5 min before starting CO2-insufflation (baseline), after capnoperitoneum establishment (T0), and at further 5-min intervals (T5, T10, T15, T20, T25, T30). Compared to baseline, pupil size was increased at T30 (P = 0.03) and respiratory frequency at T25 (P < 0.01) and T30 (P = 0.02). No other significant changes were found regarding intraocular pressure. Our data show that the induction of an intra-abdominal pressure of 10 mmHg for a 30-min laparoscopy with the use of medetomidine-butorfanol-propofol-isoflurane in spontaneously breathing dogs in the horizontal position does not result in any important changes in intraocular pressure or end-tidal CO2.
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