PubMed1989
Painful interventions can be performed on horse in standing position by means of sedative analgesia, also called standing-position anaesthesia. Combinations of anaesthetics are quite often used, in that context, for the purpose of producing analgetic effects stronger and more reliable than those that would be obtainable from one anaesthetic alone. The following combinations were comparatively tested for their analgetic and sedative effects and their effects upon the organism: Chloralhydrate with Ursonarkon (oxazolidone), Chloralhydrate with Rompun (xylazine), Chloralhydrate with morphine hydrochloride, Chloralhydrate with morphine hydrochloride and Ursonarkon, local anaesthesia in conjunction with sedation by Ursonarkon. 50 experiments were conducted on an experimental group of 10 horses under standardised conditions together with complementary tests on 71 horses under field conditions. The experimental methodology used for assessment of analgetic effects was based on defined electrical and thermic stimuli to enable determination of reactive thresholds. An objective comparison was thus possible between the above variants. Local anaesthesia in combination with complementary sedation proved to meet all demands on standing-position anaesthesia, as it was found to eliminate pain and tactile reflexes. Defence movements have to be expected, whenever preparations are used that attack the central nervous system, since while sensations of pain are suppressed, tactile stimuli may be met with reflex responses via the spinal cord and its intrinsic function.