Pressure–Volume Curve during Capnoperitoneum in Cats

• Published in: Animals (Basel) Vol. 10; no. 8; p. 1408
• Main Authors: Dorn, Melissa, Becher-Deichsel, Anja, Bockstahler, Barbara, Peham, Christian, Dupre, Gilles
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-08-2020; MDPI
• Subjects: Abdomen; Animals; Body weight; capnoperitoneum; Carbon dioxide; Cats; Correlation analysis; feline; Health aspects; intra-abdominal pressure; Laparoscopic surgery; Laparoscopy; Methods; Pressure; Pressure transducers; pressure–volume curve; Surgery; Veterinary medicine; Yield; Yield point; Austria; France
• ISSN: 2076-2615; 2076-2615
• DOI: 10.3390/ani10081408

Laparoscopy is a growing field in veterinary medicine, although guidelines are lacking. The objective of this study was to evaluate the pressure–volume curve during capnoperitoneum in cats. A total of 59 female cats were scheduled for routine laparoscopy. Pressure and volume data were recorded and processed, and the yield point of the curve was calculated using a method based on a capacitor discharging function. For the remaining 40 cats, a linear-like pressure–volume curve was observed until a yield point with a mean cutoff pressure (COP) of 6.44 ± 1.7 mmHg (SD) (range, 2.72–13.00 mmHg) and a mean cutoff volume (COV) of 387 ± 144.35 mL (SD) (range, 178.84–968.43 mL) was reached. The mean mL/kg CO2 value in cats was 208 ± 34.69 mL/kg (range, 100.00–288.46 mL/kg). The COV correlated with COP and body weight but not with body condition score (BCS). COP correlated only with the COV. This study suggests that feline patients have a pressure–volume curve similar to that of canine patients, and the same pressure limit recommendations can be used for both species. After a yield point of 6.44 mmHg is reached, the increment in volume decreases exponentially as the intra-abdominal pressure (IAP) increases.