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Adrenocortical suppression in the dog after a single dose of methylprednisolone acetate
Abstract:
Adrenal function was assessed in dogs after intramuscular administration of a single dose of methylprednisolone acetate (MPA). Twelve dogs were test challenged with adrenocorticotropic hormone (ACTH) and then assigned randomly to 1 of 3 groups and given MPA. Individual groups were test challenged with ACTH 2, 3, or 4 weeks later. All dogs were rechallenged 5 weeks after MPA administration. Plasma cortisol concentration was determined by radioimmunoassay. Basal plasma cortisol (time 0) was depressed on weeks 2 and 3, but not on weeks 4 and 5. Adrenal response to ACTH (increment of cortisol change) was suppressed on weeks 2, 4, and 5, but not on week 3. It was concluded that a single dose of MPA is capable of altering adrenal cortical function in dogs for at least 5 weeks.
Insights
A single dose of methylprednisolone acetate (MPA) in dogs suppressed adrenal function for up to five weeks. Cortisol levels and adrenal response to ACTH were monitored, revealing prolonged effects on adrenal cortical function.
Area of Science:
- Veterinary Medicine
- Endocrinology
- Pharmacology
Background:
- Methylprednisolone acetate (MPA) is a corticosteroid used in veterinary medicine.
- Assessing the duration of adrenal suppression after MPA administration is crucial for clinical practice.
Purpose of the Study:
- To evaluate the impact of a single intramuscular dose of MPA on adrenal function in dogs.
- To determine the duration of adrenal suppression following MPA administration.
Main Methods:
- Twelve dogs received a single intramuscular dose of MPA.
- Dogs were challenged with adrenocorticotropic hormone (ACTH) at 2, 3, 4, and 5 weeks post-administration.
- Plasma cortisol concentrations were measured using radioimmunoassay.
Main Results:
- Basal plasma cortisol was depressed at 2 and 3 weeks but normalized by 4 and 5 weeks.
- Adrenal response to ACTH was suppressed at 2, 4, and 5 weeks, with no suppression at week 3.
- These findings indicate that MPA can alter adrenal cortical function for at least 5 weeks.
Conclusions:
- A single dose of MPA significantly impacts canine adrenal function for an extended period.
- Veterinary professionals should consider the prolonged adrenal suppression when using MPA in dogs.
- Further research may explore dose-dependent effects and recovery timelines.