title: The effect of the novel alpha-2-adrenoceptor agonist naphthylmedetomidine on pulse rate, arterial blood pressure and sedation in rabbits.
abstract: OBJECTIVE
  The aim of this study was to investigate the effect of a novel alpha-2-adrenoceptor (alpha(2)-AR) agonist, naphthylmedetomidine, on cardiorespiratory function and sedation in rabbits in comparison with medetomidine.
  
  
  METHODS
  Prospective, randomized, experimental trial.
  
  
  METHODS
  Forty-two chinchilla rabbits of both sexes, weighing 2.5-4.5 kg.
  
  
  METHODS
  The rabbits received 350 microg kg(-1) naphthylmedetomidine (n = 21) or medetomidine (n = 21) intramuscularly according to a randomization scheme. Arterial blood pressure (AP), oxygen saturation of haemoglobin (SpO(2)), pulse rate (PR) and righting reflex were monitored for 20 minutes after injection.
  
  
  RESULTS
  Both drugs significantly decreased PR. The effect of medetomidine was significantly greater than that of naphthylmedetomidine and was evident within 1 minute. The decrease in PR after naphthylmedetomidine administration first appeared after 4 minutes. Medetomidine decreased the SpO(2) after 3 minutes but there was no effect after naphthylmedetomidine. Medetomidine decreased the mean, systolic and diastolic AP within 5 minutes of administration but naphthylmedetomidine had no effect. The mean time to loss of righting reflex was 185 and 714 seconds after the administration of medetomidine and naphthylmedetomidine respectively.
  
  
  CONCLUSIONS
  These results provide the first description of the effects of naphthylmedetomidine on cardiovascular and psychomotor functions in rabbits. Further work is required to reveal the anaesthetic sparing, analgesic or sedative effect of partial naphthylmedetomidine.
authors.affiliation: Laboratory of Experimental Anaesthesiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
authors.forename: Ladislav
authors.initials: L
authors.lastname: Hess
authors.forename: Martin
authors.initials: M
authors.lastname: Votava
authors.forename: Jitka
authors.initials: J
authors.lastname: Schreiberová
authors.forename: Jirí
authors.initials: J
authors.lastname: Málek
mesh_terms: D058647:Adrenergic alpha-2 Receptor Agonists; D018712:Analgesics, Non-Narcotic / Q000494:pharmacology; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D005260:Female; D006339:Heart Rate / Q000187:drug effects*; D006993:Hypnotics and Sedatives / Q000494:pharmacology; D007093:Imidazoles / Q000494:pharmacology*; D008297:Male; D020926:Medetomidine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D011817:Rabbits / Q000502:physiology*
chemical_list: D058647:Adrenergic alpha-2 Receptor Agonists; D018712:Analgesics, Non-Narcotic; D006993:Hypnotics and Sedatives; D007093:Imidazoles; C073198:4-(1-(1-naphthyl)ethyl)imidazole; D020926:Medetomidine