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Arterial oxygen tension and pulmonary ventilation in horses placed in the Anderson Sling suspension system after a period of lateral recumbency and anaesthetized with constant rate infusions of romifidine and ketamine.
MedLine Citation:
PMID:  24011187     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
REASONS FOR PERFORMING STUDY: Some controversy exists over whether or not horses' recovery and cardiopulmonary function are affected by suspension in slings.
OBJECTIVES: To measure arterial oxygen tension (PaO2) and pulmonary ventilation in anaesthetised horses placed in a slung-standing position (AS) after a period of lateral recumbency (RLR).
STUDY DESIGN: Randomised crossover experimental study.
METHODS: Six Standardbred horses were anaesthetised twice. Catheters were inserted into the right jugular vein and the left carotid artery. After premedication with romifidine, anaesthesia was induced with diazepam and ketamine. Following 50 min in right lateral recumbency, horses were maintained in either RLR or AS for an additional 60 min through to recovery. Anaesthesia was maintained intravenously with a constant rate infusion of romifidine and ketamine. Heart rate, respiratory rate (fR), mean arterial pressure (MBP), expiratory tidal volume, minute volumes (Vm) and end tidal CO2 were monitored continuously. Venous and arterial bloods were sampled for lactate, creatine kinase (CK) activity and blood gas analysis before premedication, after induction (T0), every 20 min for 100 min, as soon as the horse was standing (TR), and 24 h later (T24). The data were averaged within 2 anaesthetic periods, P1 (T0-T20) and P2 (T40-T100).
RESULTS: During P2, horses in the RLR group had lower PaO2 (P = 0.001), higher AaDO2 (P = 0.005), higher fR (P = 0.04) and higher Vm (P = 0.04) than horses in the AS group. PaCO2 and MBP increased in the AS group during P2 (P = 0.01 and 0.02 respectively). The recoveries were judged better in the AS group than in the RLR group (P = 0.01). During TR, lactate were higher in the RLR group than in the AS group (P = 0.007). CK activities were higher in the AS group at T24 vs TR (P = 0.02).
CONCLUSIONS: Anderson Sling suspension after a period of recumbency improves cardiopulmonary function and recovery quality in horses and therefore might be considered for use to recover hypoxic horses.
Authors:
I François; F-X Lalèyê; M Micat; K Benredouane; K Portier
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-9-6
Journal Detail:
Title:  Equine veterinary journal     Volume:  -     ISSN:  2042-3306     ISO Abbreviation:  Equine Vet. J.     Publication Date:  2013 Sep 
Date Detail:
Created Date:  2013-9-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0173320     Medline TA:  Equine Vet J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
This article is protected by copyright. All rights reserved.
Affiliation:
Université de Lyon; VetAgro-Sup, Campus Vétérinaire de Lyon, Pole Equin, Marcy l'Etoile, F-69280, France.
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