Plasma arginine vasopressin concentration in horses undergoing surgery for colic.

The research article investigates the levels of plasma arginine vasopressin (AVP) in horses suffering from colic and how it reacts to anesthesia and surgery. The study found that horses with colic had higher preanesthetic plasma AVP levels that did not increase further with anesthesia and surgery; it suggested that using exogenous AVP could be harmful for colic horses.

Study Design and Sampling

• The study was a prospective clinical study, which means it observed a group of subjects over a period of time to gauge the outcomes of certain conditions or factors.
• The research was conducted at a University teaching hospital.
• There were a total of 22 horses studied – 14 suffering from colic and 8 healthy ones. The colic horses underwent surgery for colic relief, while the healthy horses had surgery for arthroscopy (a minimally invasive surgical procedure on a joint).

Findings

• The study involved measuring plasma AVP before and after anesthesia administration in both groups of horses.
• Before anesthesia and 30 and 60 minutes after induction, the horses with colic had higher plasma AVP concentrations than the control horses (P ≤ 0.001).
• The difference in AVP concentrations between the two groups was not significant from there on during the anesthesia.
• The control group showed an increase in plasma AVP concentration during the 120 minutes of anesthesia. This increase was not observed in the colic horses.

Implications and Conclusions

• The results showed that horses suffering from colic had higher preanesthesia plasma AVP levels, which did not increase further in response to anesthesia and surgery.
• The research indicated that exogenous AVP (externally sourced) can decrease splanchnic perfusion (blood flow to the abdominal organs), which can harm horses with colic.
• Due to this potential harm, the study suggested that using exogenous AVP to support blood pressure in anesthetized colic horses could be inappropriate.
• The researchers recommend further studies to clearly define when it would be appropriate to use AVP in horses suffering from colic.