Retrospective analysis of historical, clinical, ultrasonographic, serum biochemical and haematological data in prognostic evaluation of equine liver disease.
Authors: Durham A E, Newton J R, Smith K C, Hillyer M H, Hillyer L L, Smith M R W, Marr C M
Journal: Equine veterinary journal
Summary
# Editorial Summary Durham and colleagues retrospectively evaluated 116 mature horses with suspected hepatic disease to determine which noninvasive diagnostic findings reliably predicted 6-month survival outcomes, addressing the clinical reality that standard liver function tests often correlate poorly with actual disease severity and patient prognosis. Their analysis encompassed clinical signs, ultrasonographic findings, and a comprehensive panel of serum biochemistry and haematology markers, systematically testing each variable's prognostic value. Clinical severity emerged as the single most reliable predictor of outcome, whilst several biochemical abnormalities—elevated total bile acids, alkaline phosphatase, gamma-glutamyl transferase, and low serum albumin—were associated with poorer survival, though notably with limited individual prognostic power; intriguing secondary findings included unexpected associations between elevated plasma fibrinogen, low serum creatinine, and non-survival that warrant further investigation. The work revealed important ultrasonographic–pathological correlations, with detected parenchymal changes predicting fibrosis, haemosiderosis and biliary hyperplasia, though again with variable outcome prediction. For practitioners, this study reinforces that whilst biochemical and imaging findings contribute to diagnostic accuracy, clinical assessment of disease severity should remain paramount in formulating prognosis, and caution should be exercised against over-interpreting individual laboratory or ultrasound abnormalities in isolation.
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Practical Takeaways
- •Severity of clinical signs is the most reliable noninvasive prognostic indicator in suspected equine liver disease — use this as your primary guide rather than relying heavily on individual biochemical values
- •While elevated bile acids and liver enzymes (AP, gammaGT) provide supporting evidence of liver disease, they have limited independent prognostic value and can be misleading when interpreted in isolation
- •Consider fibrinogen and creatinine concentrations alongside traditional liver markers; elevated fibrinogen and low creatinine may indicate worse outcomes even when other parameters appear borderline
Key Findings
- •Clinical signs suggestive of liver disease and hepatic encephalopathy were the strongest predictors of poor prognosis within 6 months in mature horses with suspected liver disease
- •Elevated total bile acids, alkaline phosphatase, gamma-glutamyl transferase, and low serum albumin and urea were significantly associated with nonsurvival
- •Increased plasma fibrinogen and low serum creatinine concentrations were novel findings associated with nonsurvival in equine liver disease cases
- •Ultrasonographic abnormalities, erythrocytosis, and leucocytosis were associated with poorer prognosis, but noninvasive test results did not always correlate with degree of hepatic disease