Factors associated with survival in 148 recumbent horses.
Authors: Winfield L S, Kass P H, Magdesian K G, Madigan J E, Aleman M, Pusterla N
Journal: Equine veterinary journal
Summary
# Editorial Summary: Survival Factors in Recumbent Horses Recumbency in horses carries a grave prognosis, yet little quantitative evidence has guided clinical decision-making regarding outcome prediction. Researchers at UC Davis retrospectively analysed 148 hospitalised recumbent horses (1995–2010) using exact logistic regression to identify clinical parameters associated with survival within the first 72 hours and at hospital discharge. Of the 148 cases, only 39 horses (26%) survived, with early mortality (within 3 days) linked to four key factors: prolonged clinical signs before admission (>24 hours increased death odds by 4.16-fold), presence of band neutrophils suggesting systemic inflammation (7.94-fold increase in death odds), failure to utilise a sling during supportive care (4.22-fold increase), and inability to stand after treatment (231-fold increase in death odds—the strongest predictor by far). Interestingly, increasing treatment expenditure correlated with improved survival odds, likely reflecting owner commitment and intensity of supportive care rather than cost itself. These findings underscore that early intervention within 24 hours of sign onset, coupled with vigilant monitoring of the immune response and optimisation of mechanical support systems, represent critical intervention points; the dramatic predictive value of standing ability suggests that horses demonstrating any weight-bearing capacity on their limbs warrant continued intensive management, whilst those remaining completely unable to rise despite aggressive therapy present a substantially worse prognosis warranting frank prognostic discussions with owners.
Read the full abstract on PubMed
Practical Takeaways
- •Early intervention is critical—horses with clinical signs for >24 hours before hospitalization have significantly worse prognosis; time to referral matters
- •Response to early treatment and ability to use a sling are strong indicators of survival potential; horses unable to stand within the first 3 days are unlikely to survive
- •Band neutrophilia on admission bloodwork is an adverse prognostic indicator; use this alongside clinical assessment to inform owners about realistic survival expectations
Key Findings
- •Clinical signs lasting >24 hours prior to presentation increased odds of death within 3 days by 4.16 times (P=0.043)
- •Presence of band neutrophils increased odds of death within 3 days by 7.94 times (P=0.02)
- •Inability to stand after treatment was strongly associated with death (OR 231.15, P<0.0001)
- •Horses that could not use a sling had 4.22 times increased odds of death within 3 days (P=0.031)
- •Overall survival rate was 26.4% (39 of 148 horses survived to discharge)