Document Detail

Effects of injection of botulinum toxin type B into the external anal sphincter on anal pressure of horses.
MedLine Citation:
PMID:  14719698     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine effects on anal pressure of horses after local injection of the external anal sphincter with Clostridium botulinum toxin type B.
ANIMALS: 11 healthy adult horses.
PROCEDURE: Peak and resting anal sphincter pressures were measured with a custom-made rectal probe that was connected to a pressure transducer. Pressures were measured before treatment and after injection with botulinum toxin type B (BTB) or saline (0.9% NaCl) solution. Dose titration with 500, 1,000, 1,500, and 2,500 U of BTB was completed. Physical changes, behavior, and anal pressure were recorded for each horse.
RESULTS: Injection of 1,000 U of BTB caused a significant reduction in peak anal pressure from days 2 to 84, compared with pressure in control horses. Maximal effect of the toxin was observed within the first 15 days after injection, followed by a slow return to baseline during the 168-day period. Injection of 2,500 U of BTB in the anal sphincter in 1 horse resulted in lethargy, generalized weakness, and dysphagia for 14 days. Adverse clinical effects were not observed in horses after injections with 500, 1,000, or 1,500 U of BTB.
CONCLUSIONS AND CLINICAL RELEVANCE: The effect of focal intramuscular injection of BTB in horses is similar to that reported for other species. However, horses appear to be more sensitive to BTB, compared with other species, and clinical signs of botulism may develop at doses exceeding 1,500 U. Injections of BTB in the external anal sphincter of mares may be useful to reduce incisional dehiscence after repair of perineal lacerations.
David Adam-Castrillo; Nathaniel A White; Lydia L Donaldson; Martin O Furr
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of veterinary research     Volume:  65     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-01-14     Completed Date:  2004-03-04     Revised Date:  2013-11-25    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  26-30     Citation Subset:  IM    
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MeSH Terms
Anal Canal / physiology*
Analysis of Variance
Botulinum Toxins / pharmacology*
Horses / physiology*
Injections, Intramuscular
Muscle Contraction / drug effects*,  physiology
Reg. No./Substance:
0Y70779M1F/rimabotulinumtoxinB; EC Toxins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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