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Acépromazine, propofol et ECG chez le chat
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L`utilisation du propofol après une pré-médication à l`acépromazine est une pratique courante en clinique chez les animaux de compagnie. Mais elle conduit à une diminution de la fréquence cardiaque et de la pression artérielle qui mérite d`être reconsidérée chez les animaux malades – problème qui ne se pose pas chez les chats sains.
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The study, a prospective, uncontrolled experimental trial, included twenty healthy adult crossbred male and female cats aged between 3 and 5 years, weighing 2.8-5.0 kg (mean 3.9 kg).
Cats were pre-medicated with acepromazine 0.1 mg kg1 subcutaneously and anesthesia was induced with intravenous (IV) propofol 6 mg kg1 and maintained with a continuous infusion of propofol at 0.5 mg kg1 minute1 for 60 minutes.
Electrocardiographic parameters and systolic blood pressure obtained by Doppler ultrasound were recorded before pre-medication (T0), 30 (T30), and 60 (T60) minutes after beginning the continuous infusion, and 30 minutes after its cessation (T90). Repeated measures anova was used to perform statistical analysis.
A significant decrease in heart rate was observed at all time points when compared with T0 values. The PR interval increased significantly at T60 and T90. Systolic blood pressures during anesthesia were significantly lower than at T0 and T90.
The changes seen were not clinically important in normal cats but given the reduction in heart rate and systolic blood pressure, careful consideration should be given before using this technique in patients in which hypotension or a reduction in heart rate would be poorly tolerated.
Source: Pereira, Guilherme G, Larsson, Maria Helena MA, Yamaki, Fernanda L, Soares, Elaine C, Yamato, Ronaldo J, Neto, Moacir L, Froes, Tilde R & Bastos, Luciana V (2004): Effects of propofol on the electrocardiogram and systolic blood pressure of healthy cats pre-medicated with acepromazine. In: Veterinary Anaesthesiology and Analgesia 31 (3), 235-238.
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