Some Aspects of Neuromuscular Blockers and It`s Present Status

Chon, Se Ung

Abstract

Anesthesiologists may have close relationship with muscle relaxants in clinical practice fortunately, few of the new muscle relaxants were discovered and used in clinic recently. In this moment we have to look back the old muscle relaxants. Undesirable side effects of thIn old ones are less common, but encountered often enough to be troublesome. For example, succinylcholine(depolarizer) mar enhance drsrhythmia, rise in plasma pot-assium, increase in intraocular pressure, rise in intragastric pressure, triggering malignant hrperpyrexia Trestle Pain and dual block etc. Is there a simple screen test for the atypical cholinesterase? Unfortunately it's not available now. Nevertheless depolarizer was still used in many decades. That's the matter? Muscle relaxants are also affected by many factors those are renal excretion, metabolism of the drug, lilver or disease, effect of jaundice, muscle blood flow, production and release of acetylcholine, bod)'temperature, antibiotics, other drug interactions, electrolyte imbalance, pathological status, individual differences and species differences etc. Sometimes it will make a trouble for the anesthesia practice. So anesthesiologists must be familiar with the use of muscle relaxants. And also we have to think twice about it's clinical use before given to the patients. What Is the right methods of rational use of muscle relaxants? What is the right way to reverse muscle relaxation? Obviously, return of normal muscle function followin? muscle relaxant administration is of prime importance to restoration of adequate spontaneous ventilation because it is clini-call velr i rnportant. In human study; supramaximal ulnar nerve stimulation was delitrered br a Peripheral nerIFe stimulatur(Ml'oftest, Biometer MK II) through electrode at the wrist. Stimuli were detail erect continuousl) by either 7 TOF or sin 91e twitch stimuli. The resultant force of thumb adduction was measured and recorded by Biophysiograph(San Ei, Japan) through the force displacoment transducer. In animal study: all animals were intubated through a tracheostomr under the intraper-itoneal urethane anesthesia with nembutal given intravenously. Respiration was controlled by means of Shinano animal respirator. The body temperature 7as kept at 35 degrees C with a thermo-blanket. The common peroneal nerve and anterior tibial muscle was exposed and nerve stimulator was applied to the nerve-muscle preparation. The twitch height of the muscle contraction was recorded on a Biophrsiograph through the force displacement Ira-nsfucer. The common peroneal nerve was stimulated supramaximally using a peripheral nerve stimulator with a "TOF" stimulation or single twitch stimulation. Obviously, newly introduced muscle relaxants are certainly have advantage over the old ones but we should hatre further studies on them. Conclusions ; 1) Minimal dose of muscle relaxant which may produce 90~100% of twitch depression may use depend on the types of surgery. 2) To evaluate the type and degree of muscle relaxation intermittently by use of the peripheral nerve stimulator is essential. 3) Best choice of the muscle relaxants are should be non-depolarizers those mar promp-tly reversed by anticholinesterases.

Some Aspects of Neuromuscular Blockers and It`s Present Status

Abstract

MeSH Terms

Cited

Save citations to file

Email citations