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Effects of morphine and fentanyl constant rate infusion on urine output in healthy and traumatized dogs
Authors:Anderson Marlo K  Day Thomas K
Affiliation:Louisville Veterinary Specialty and Emergency Services, Louisville, KY, USA. zoovet2be@hotmail.com
Abstract:ObjectiveTo determine whether healthy and traumatized dogs receiving a constant rate infusion (CRI) of either morphine or fentanyl have decreased urine production.Study designProspective randomized controlled study.Animal populationEighteen privately owned previously healthy dogs that had undergone trauma were included. Twenty-three privately owned healthy dogs were used as the controls.MethodsTraumatized dogs were randomized into one of two groups. Group Tmorphine received a CRI of morphine (0.12 mg kg−1 hour−1) and group Tfentanyl received a CRI of fentanyl (3 μg kg−1 hour−1) both administered in lactated Ringer’s solution (LRS) at a rate of 60 mL kg−1 day−1. Control healthy dogs were randomized into one of three groups. The LRS control group (CLRS) (n = 8) received LRS at a rate of 60 mL kg−1 day−1. Group Cmorphine (n = 8) and group Cfentanyl (n = 7) received the same infusions as Tmorphine and Tfentanyl, respectively. Collected data were identical for all groups and consisted of measuring total fluid administered, urine output, and urine specific gravity (USG) for a 24-hour period. An analysis of variance (anova) was used for statistical analysis and a p < 0.05 was considered statistically significant.ResultsUrine output was significantly decreased (p < 0.05) in all groups compared with the LRS control group. The end mean USG was significantly lower (p = 0.003) in the LRS control group compared with all other groups.ConclusionsThere was a decrease in urine output with a CRI of morphine or fentanyl in both healthy and traumatized dogs.Clinical relevanceDecreased urine output caused by an opioid effect might lead to improper assessments of renal function and urine production.
Keywords:fentanyl  morphine  trauma  urine production
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