The Antagonism Effects of Neostigmine on Vecuronium - induced Neuromuscular Blockade in Renal Failure Patients / 대한마취과학회지

The elimination of most anticholinesterases depends on the kidney, even if the main organ for their metabolism is the liver. Renal excretion of pyridostigmine, edrophonium and neostigmine accounts for 15%, 70% and 50%, respectively. In the absence of renal function, the serum half-life of neostigmine is prolonged, its plasma clearance is decreased However, the pharmacodynamics of neostigmine have not been determined in renal failure. This study was designed to compare the neostigmine dynamics in 18 patients with normal renal function to that in 18 patients with renal failure(Group I & II, respectively). Using the flexor carpi ulnaris EMG via ulnar nerve stimulation with Train-Of-Four(TOF) under the constant infusion of vecuronium to produce about 85%-twitch depression, the responses of neostigmine with three different doses were obtained. The results are follows; 1) The constant infusion rates of vecuronium to maintain sbout 15&-twitch height prior to the administration of neostigmine showed no significant difference between two groups. 2) Immediately prior to each dose of neostigmine, the mean values of twitch heights were 11.7 to 13.7%. 3) There was no significant difference in the onset time, maximum twitch responses and antagonism effects between two groups in respect to each same dose of nesotigmine. 4) The duration of neostigmine with the half of ED only in Group II was significantly longer than that in Group I, even if the durations with the other doses in Group II were not significantly longer than those in Group L These results suggest that the reversal effect of neostigmine to vecuronium-induced block- ade may be outlasted in patients with renal failure and the prolongation of neostigmine effeet may render some benefits to reverse the relaxants which have the limitation of its elimination in this patients.

The Effect of Intravenous Lidocaine Infusion on Succinylcholine - or Vecuronium - induced Neuromuscular Block in the Cat / 대한마취과학회지

The effect of lidocaine on the neuromuscular junction and the interaction between lidocaine and the muscle relaxant, succinylcholine(SCC) or vecuronium(VEC), were investigated in 12 cats of either sex using the sciatic nerve-anterior tibialis muscle preparation. The degree of twitch depression with lidocaine itself was 16.43+/-14.94%, and the ED from dose-response curves of SCC and VEC(8.35+/-4.62 and 6.36+/-8.03 ug/kg, respectively) in group II (under lidocaine infusion) were smaller than those(20.57+/-15.80 and 8.98+/-7.31 ug/kg) in group I (without lidocaine). There was no difference in the duration of action of SCC and VEC between the two groups, but the onset of VEC in group II was longer than in group I(p<0.05), The mean arterial pressure(MAP) after lidocaine infusion was reduced 149.17 to 130.83mmHg and MAPs at the same dose of each agent were also lower in group II than in group L The authors conclude that lidocaine itself produces the twitch depression and potentiates the SCC-or VEC-induced neuromuscular block. However, there is no influence on the duration of SCC or VEC.