1. Preoperative and Postoperative L-Lactatemia Assessment for the Prognosis of Right Abomasal Disorders in Dairy Cattle.
- Author
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Buczinski, S., Boulay, G., and Francoz, D.
- Subjects
DAIRY cattle ,HEART beat ,VOLVULUS ,LACTATES ,TACHYCARDIA ,ALKALINE phosphatase ,ANIMAL health - Abstract
Background Preoperative L-lactatemia and heart rate have been suggested as prognostic indicators of outcome for cows with right dilatation of the abomasum or volvulus ( RDA/ AV). However, postoperative L-lactatemia has not been assessed as a potential prognostic tool. Objectives To determine the prognostic value of postoperative L-lactatemia ( LAC
2 ), duration of treatment (Dt), relative L-lactatemia difference (compared with preoperative L-lactatemia [LAC1 ]) ([LAC2 − LAC1 ]/LAC2 ) and change in L-lactate over time ([LAC2 − LAC1 ]/Dt) as compared to preoperative findings ( LAC1 and heart rate [ HR]) as prognostic factors in dairy cows with RDA/ AV. Animals A total of 41 dairy cows were included: 19 with AV and 22 with RDA; 11 cows had a negative outcome ( NO) and 30 cows had a positive outcome ( PO) based on telephone follow-up with owners 30 days after surgery. Methods Prospective cohort study. Analysis was performed using logistic regression and comparison of area under the receiver operating characteristics curve ( AUC) using nonparametric tests. Results LAC1 > 1.4 mmol/L or LAC2 > 2.2 mmol/L had the same accuracy with sensitivity of 100% (95% CI, 75.1-100%) and specificity of 80% (95% CI, 61.4-92.3%) for predicting NO. The relative L-lactatemia difference ([LAC2 − LAC1 ]/LAC1 ) or lactate kinetics ([LAC2 − LAC1 ]/Dt) were not associated with prognosis. The AUC of the preoperative model (which included HR and lnLAC1 ) was 0.92 (95% CI, 0.83-1.0) and that of the postoperative model (including only lnLAC2 ) was 0.95 (95% CI, 0.88-1.0); these were not significantly different. Conclusions and Clinical Importance Postoperative L-lactatemia is helpful to predict outcome in cows with RDA/ AV. The short-term change in blood L-lactate is not a useful prognostic indicator , at least during the period of time spent on the farm for surgery and treatment. [ABSTRACT FROM AUTHOR]- Published
- 2015
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