The post-tetanic count during vecuronium-induced neuromuscular blockade in halothane-anaesthetized dogs

被引:1
作者
Sarrafzadeh-Rezaei, Farshid [2 ]
Clutton, R. Eddie [1 ]
机构
[1] Royal Dick Sch Vet Studies, Dept Vet Clin Sci, Roslin EH25 9RG, Midlothian, Scotland
[2] Univ Urmia, Dept Clin Sci, Coll Vet Med, Orumiyeh, Western Azerbai, Iran
关键词
dogs; halothane; post-tetanic count; vecuronium; MUSCLE-RELAXANT; TIME-COURSE; ATRACURIUM; PHARMACOKINETICS; NEOSTIGMINE; PHARMACODYNAMICS; TRAIN-OF-4; ROCURONIUM; RECOVERY; PTC;
D O I
10.1111/j.1467-2995.2009.00457.x
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
To evaluate the post-tetanic count (PTC) for predicting the return of reversible neuromuscular blockade at the n. facialis-m. nasolabialis (nF-mNL) and n. ulnaris-mm. carpi flexorii (nU-mCF) nerve-muscle units (NMUs) during profound vecuronium neuromuscular blockade in halothane-anaesthetized dogs. Randomized, prospective, experimental study. Twenty-five dogs (seven male 18 female) undergoing surgery; mean age: 4.8 years; mean body weight 22 kg. Thirty minutes after acepromazine (0.05 mg kg(-1)) and morphine (0.5 mg kg(-1)) pre-medication, anaesthesia was induced with intravenous (IV) thiopental and maintained with halothane, N2O and O-2. The lungs were mechanically ventilated and end-tidal halothane concentration (Fe'(HAL)) maintained at 1.04%. Neuromuscular transmission was monitored using the train-of-four count (TOFC) at one nF-mNL and both nU-mCF units. Vecuronium (50 mu g kg(-1) IV) was injected after 15 minutes constant Fe'(HAL). When the first twitch (T1) at both nU-mCF units had disappeared (t = 0) one (randomly allocated) ulnar nerve was stimulated every 5 minutes using PTC; TOF stimulation continued at the other sites. The PTC was plotted against the interval between recording time and T1's reappearance at the other NMUs. At t = 0, the mean PTC in the contralateral nU-mCF unit was 18 (range 0-20). Mean PTC was a minimum at t = 5, rising to the maximum (20) at 25 minutes. Six dogs were vecuronium-resistant as monitored by PTC. Excluding data from these revealed a strong negative relationship between ulnar PTC and the time taken for T1's return at the facial (r = -0.7018; p < 0.00001) and contralateral ulnar (r = -0.8409; p < 0.00001) NMUs. Post-tetanic count monitoring beginning > 5 minutes after the TOFC at nU-mCF = 0 provided a reliable estimate of T1's return at ulnar and facial NMUs.
引用
收藏
页码:246 / 254
页数:9
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