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Morphine not only reduces the frequency of "pain faces" but has no effect on GS in baseline, pain-free mice. In mice, the GS offers a means of assessing post-operative pain that is as effective as manual behavioural-based scoring, without the limitations of such approaches. Facial grimacing by mice after undergoing laparotomy surgery indicates postoperative pain lasts for 36 to 48 h and at relatively high levels for 8 to 12 h with relative exacerbation during the early dark active photo-phase.
Furthermore, the grimacing indicates that buprenorphine is fully efficacious at recommended doses against early postoperative pain, but carprofen and ketoprofen are efficacious only at doses much higher than currently recommended: acetaminophen is not efficacious. The effectiveness of the GS at identifying pain was compared with a traditional welfare scoring system based on behavioural, clinical and procedure-specific criteria.
It was reported that post hoc GS but not real-time GS indicated a significant proportion of the mice were in low-level pain at 24 h which were not identified as such by traditional assessment methods. Importantly, those mice identified as experiencing low-level pain responded to analgesic treatment, indicating the traditional methods of welfare assessment were insensitive in this aspect of pain recognition. Administration of a common analgesic, buprenorphine , had no effect on the GS of either strain.
There is no difference in GS scores between mice handled using a tube compared with mice picked up by the tail, indicating these handling techniques are not confounding factors in GS assessment. In mice, the nose and cheek at baseline have a smooth appearance, but in the presence of pain, change to distinct bulges in both the nose and cheek regions.
History[ edit ] Facial expressions have long been considered as indicators of emotion in both human and non-human animals. The biologist, Charles Darwin , considered that non-human animals exhibit similar facial expressions to emotional states as do humans.
In , a team of researchers successfully developed  the first method to assess pain using changes in facial expression in any non-human animal species.
Broadly speaking, GS quantify spontaneous pain according to objective and blinded scoring of facial expressions, as is done routinely for the measurement of pain in non-verbal humans. Observers score the presence and extent of "facial action units" FAU , e.
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These are scored in real-time by observing the animal directly, or, post hoc from photographs or screen-grabs from videos. This method of pain assessment is highly applicable to prey animals which tend to inhibit the overt expression of pain to prevent appearing vulnerable to predators.
For this reason, behavioural changes in these species are mainly observed with acute pain hours but are less pronounced in longer-lasting pain days.
For example, the analgesic morphine reduces pain but can affect other aspects of behaviour in pain-free animals, for example, excitement, increased activity or sedation, which can hamper traditional behavioural assessment of its action on pain.
Morphine not only reduces the frequency of "pain faces" but has no effect on GS in baseline, pain-free mice.Several common age-associated changes that occur in particular organs and systems are well recognised and include greying hair and wrinkling of the skin.
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The lifespan of an individual is influenced by many factors, some of which are hereditary Ch. Seventeen FAU have been identified and the involved anatomical structures behind each facial expression are explained and compared to facial expressions seen in other species.
There was high reliability between and within the observers, and high accuracy.
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Increasing age is a risk factor for some diseases, e.