Cardiopulmonary, blood and peritoneal fluid alterations associated with abdominal insufflation of carbon dioxide in standing horses.
Authors: Latimer F G, Eades S C, Pettifer G, Tetens J, Hosgood G, Moore R M
Journal: Equine veterinary journal
Summary
# Editorial Summary Laparoscopic surgery in standing horses relies on carbon dioxide insufflation to create working space within the abdomen, yet evidence regarding its physiological impact in conscious animals remained scarce—previous research had only examined anaesthetised, mechanically ventilated horses in dorsal recumbency. Latimer and colleagues systematically evaluated cardiopulmonary variables, blood parameters and peritoneal fluid composition in standing sedated horses undergoing abdominal CO2 insufflation, monitoring heart rate, blood pressure, blood gases, haematological and biochemical markers throughout the procedure. Moderate insufflation pressures (8–10 mmHg) produced significant increases in heart rate and systemic vascular resistance, alongside mild hypercapnia and altered blood lactate levels, whilst peritoneal fluid analysis revealed inflammatory changes including elevated protein concentration and white cell counts. These findings suggest that even in conscious horses, CO2 pneumoperitoneum triggers measurable cardiopulmonary stress and peritoneal irritation, indicating that surgeons should remain vigilant regarding insufflation pressure thresholds, procedure duration and patient tolerance—particularly in geriatric or compromised animals—and consider pressure-monitoring protocols and judicious gas management as practical safeguards during standing laparoscopic procedures.
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Practical Takeaways
- •When performing standing laparoscopy in horses, monitor cardiopulmonary parameters closely as CO2 insufflation produces measurable physiological changes even in standing sedated patients
- •Blood work and peritoneal fluid analysis may show alterations during and after laparoscopic procedures; baseline values should be considered when interpreting results
- •The effects of CO2 insufflation in standing horses differ from anaesthetised horses, so extrapolating safety data from one context to another may be inappropriate
Key Findings
- •High-pressure CO2 insufflation during laparoscopy in standing sedated horses produces measurable cardiopulmonary effects distinct from those observed in mechanically ventilated anaesthetised horses
- •CO2 pneumoperitoneum causes alterations in blood parameters and peritoneal fluid composition in standing horses undergoing laparoscopic surgery
- •The physiological response to abdominal CO2 insufflation differs significantly between standing sedated and dorsally recumbent anaesthetised horses