Risk assessment in equine anesthesia: a first evaluation of the usability, utility and predictivity of the two-part CHARIOT.

The research investigates the usability and predictive power of three risk assessment scores—ASA-PS-Equine, 10-RS, and CHARIOT—in equine anesthesia to predict peri-anesthetic morbidity and mortality. Their findings indicate all three scores can provide useful information for predicting mortality risk yet struggle to forecast intra- and postoperative complications.

Research Methodology

• The research was conducted on 300 horses undergoing pre-anesthetic risk assessment through three scoring techniques – the American Society of Anesthesiologists-Physical Status boosted with equine-specific diseases (ASA-PS-Equine), a 10-part multifactorial rubric risk scale (10-RS), and a combination of both known as the Combined horse anesthetic risk identification and optimization tool (CHARIOT).
• Intra- and post-anesthetic complications, the recovery phase, and mortality were recorded for seven days after general anesthesia.
• The data was analyzed for utility and predictive power of the three scores using binomial logistic regression and receiver operating characteristic (ROC) curve analysis.
• The team assessed inter-observer reliability, speed, safety, usability, and face validity for ASA-PS-Equine and 10-RS using five hypothetical patients.

Findings

• The research found statistically significant connections between all scores and various intra-anesthetic complications as well as recovery phase parameters.
• The discriminant capacity of the scores regarding the incidence of intra- and post-anesthetic complications was deemed low (with AUC ranging from 0.6093-0.6701 for intra-anesthetic and 0.5373-0.6194 for post-anesthetic complications).
• However, the scores specifically showed the highest diagnostic accuracy for overall mortality (with AUC = 0.7526-0.7970). The ASA-PS-Equine score differentiated most precisely (AUC = 0.7970 and 95% CI 0.7199-0.8741).
• Between the two, the ASA-PS-Equine had a better inter-observer reliability (κ = 0.52) than the 10-RS with κ = 0.39.
• Patient assignment to the CHARIOT was primarily rated as rather easy, fast or very fast.

Conclusions and Limitations

• The research concluded that all three scores can contribute valuable information for predicting equine patients’ mortality risk under general anesthesia. However, they do not effectively predict intra- and postoperative complications.
• Nonetheless, the study’s results are limited due to its monocentric design and the inability to secure the entire range of points.