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Veterinary anaesthesia and analgesia2003; 30(3); 124-137; doi: 10.1046/j.1467-2995.2003.00139.x

Preliminary evaluation of a behaviour-based system for assessment of post-operative pain in horses following arthroscopic surgery.

Abstract: To develop a method for objective assessment of equine post-operative pain. Methods: Prospective nonblinded clinical study. Methods: Twelve adult horses: Group 1 (G1, n = 6), admitted for arthroscopy (under general anaesthesia, with multimodal analgesia); Group 2 (G2, n = 6), 'pain free' controls. Methods: Horses were filmed continuously (CVI, time-lapse video recorder) over 72 hours, from 24 hours pre-surgery (PS) to 48 hours post-recovery (PR) (G1), and over 24 hours (G2). Activity budgets were determined from 24 to 0 hours PS, 0-24 and 24-48 hours PR (G1) and for 24 hours (G2). Using direct observation (DO), active behaviours and postures were recorded at set time points PS and PR (G1) and at two time points (morning/evening) (G2). Heart rate (HR) and respiration rate (RR) were recorded simultaneously. Statistical analysis investigated within-group and between-group time-related changes in behaviour, HR and RR. Results: There was no difference in HR or RR between G1 and G2 at any time point. Anaesthetic 'hangover' and hunger-related activity modulated behaviour from 0 to 6 hours PR, when abnormal postures and locomotion occurred in all G1 horses, but no G2 horses. Compared with G1 (0-24 hours PR), G2 spent more time eating (t = -3.34, p < 0.01), more time at the front of the stable (t = -2.42, p < 0.05), and less time exhibiting 'abnormal' behaviour (U = 56, p < 0.01). Comparing PS and PR behaviour, G1 spent less time exploring from 24 to 48 hours PR (t = 3.49, p < 0.05), less time in sternal recumbency (t = -3.8, p < 0.05) and less time moving (t = 3.19, p < 0.05). Horses tended (p < 0.07) to spend less time positioned in the front of the stable PR (less from 24 to 48 hours PR than from 0 to 24 hours PR). Comparing PR (evening) behaviour, G2 spent more time with head above withers (U = 21.5, p < 0.01), and ears forwards (U = 22, p < 0.01). G1 showed time-related changes (all p < 0.05) in time with lower lip tense (S = 15.8), eating (S = 17.08) and with head positioned above withers (S = 18.04). No differences in event behaviours were observed between G1 and G2. Within G1, only olfactory behaviour varied significantly with time (S = 14.52, p < 0.05). Conclusions: Changes in equine behaviour suggestive of post-operative discomfort were identified using both DO and CVI. Analysis of activity budgets may be a more sensitive method of identifying behavioural changes indicative of equine discomfort than repeated DO of specific events and postures.
Publication Date: 2003-09-23 PubMed ID: 14498844DOI: 10.1046/j.1467-2995.2003.00139.xGoogle Scholar: Lookup
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  • Evaluation Study
  • Journal Article

Summary

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The research article focuses on developing an objective method to ascertain post-operative pain in horses that have undergone arthroscopic surgery. Utilizing behavioral analysis and physiological measures like heart and respiration rate, the study aims to identify signs of discomfort in the horses post-surgery.

Research Methodology

  • The study was conducted on 12 adult horses divided into two groups: the first group underwent arthroscopic surgery, and the second group served as ‘pain-free’ controls.
  • Horses in both groups were continuously filmed: 72 hours for the surgical group (including 24 hours pre-surgery and 48 hours post-recovery), and 24 hours for the control group.
  • The researchers’ methods aimed to establish ‘activity budgets’ of the horses by evaluating their active behaviors and postures at set time points pre-surgery and post-recover for the surgical group, and at two time points for the control group.
  • Heart rate and respiration rate of the horses were also recorded simultaneously to correlate physical reactions with behavior.
  • Statistical analysis was used to investigate the alterations in behavior, heart rate and respiration rate within and between the two groups over time.

Research Findings

  • The study found no significant difference in heart rate or respiration rate between the two groups at any time point.
  • Alterations in behavior were observed in the surgical group due to effects of anesthesia and hunger from 0 to 6 hours post-recovery.
  • All horses in the surgical group exhibited abnormal postures and locomotion in this period, whereas no such behavior was observed in the control group.
  • Comparatively, horses in the control group spent more time eating and positioned towards the front of the stable, displaying less abnormal behavior.
  • Observations also showed that post-recovery, the surgical group spent less time exploring, moving and in sternal recumbency.
  • Within the surgical group, the researchers noted time-related behavioral changes such as increase in time spent with tensed lower lip, eating, and with head positioned above withers. However, no difference in repeated event behaviors was observed between the two groups.
  • In the surgical group, the only olfactory behavior was seen to vary significantly with time.

Conclusions

  • The study concluded that equine behavior showing signs of post-operative discomfort can be identified effectively through Direct Observation and Continuous Video Recording.
  • Analyzing changes in the horses’ activity budgets was deduced to be a more sensitive method for identifying behavioral changes reflecting discomfort in horses, as compared to repeated observations of specific events and postures.

Cite This Article

APA
Price J, Catriona S, Welsh EM, Waran NK. (2003). Preliminary evaluation of a behaviour-based system for assessment of post-operative pain in horses following arthroscopic surgery. Vet Anaesth Analg, 30(3), 124-137. https://doi.org/10.1046/j.1467-2995.2003.00139.x

Publication

ISSN: 1467-2987
NlmUniqueID: 100956422
Country: United States
Language: English
Volume: 30
Issue: 3
Pages: 124-137

Researcher Affiliations

Price, Jill
  • Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, Easter Bush, Roslin, Midlothian EH25 9RG, UK. Jill.Price@ed.ac.uk
Catriona, Seago
    Welsh, Elizabeth M
      Waran, Natalie K

        MeSH Terms

        • Animals
        • Arthroscopy / adverse effects
        • Arthroscopy / veterinary
        • Behavior, Animal
        • Female
        • Heart Rate
        • Horse Diseases / diagnosis
        • Horse Diseases / physiopathology
        • Horses
        • Male
        • Motor Activity
        • Pain Measurement / methods
        • Pain Measurement / veterinary
        • Pain, Postoperative / diagnosis
        • Pain, Postoperative / physiopathology
        • Pain, Postoperative / veterinary
        • Posture
        • Respiration
        • Video Recording / methods

        Citations

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