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Diltiazem inhibits halothane-induced contractions in malignant hyperthermia-susceptible muscles in vitro
Abstract:
The ability of diltiazem to suppress halothane and halothane-caffeine induced contractures in malignant hyperthermia (MH) susceptible pig muscle, was tested in vitro. Muscle specimens were divided into two groups and tested with a modified halothane-caffeine contracture test. One group acted as the control; the other group was pretreated with diltiazem 20 mumol litre-1. The control muscles developed contractures attributable to halothane and halothane-caffeine, whereas the diltiazem-treated specimens did not. Increases in muscle twitch tension as a result of halothane or halothane-caffeine exposure occurred in treated and untreated specimens, but were significantly delayed in the presence of diltiazem. Muscle exhaustion observed after halothane and halothane-caffeine exposure in the control specimens did not occur in the diltiazem treated muscles.
Insights
Diltiazem effectively suppressed halothane-induced muscle contractures in malignant hyperthermia (MH) susceptible pigs. This calcium channel blocker delayed muscle tension increases and prevented exhaustion in vitro.
Area of Science:
- Pharmacology
- Anesthesiology
- Muscle Physiology
Background:
- Malignant hyperthermia (MH) is a severe pharmacogenetic disorder triggered by volatile anesthetics.
- MH susceptibility involves abnormal calcium regulation in skeletal muscle.
Purpose of the Study:
- To investigate the in vitro efficacy of diltiazem in suppressing halothane and halothane-caffeine induced muscle contractures in MH-susceptible porcine muscle.
- To evaluate diltiazem's effect on muscle tension development and fatigue during MH triggering agents exposure.
Main Methods:
- In vitro study using a modified halothane-caffeine contracture test on porcine muscle specimens.
- Comparison between control muscle groups and those pretreated with diltiazem (20 mumol litre-1).
Main Results:
- Diltiazem pretreatment completely prevented halothane and halothane-caffeine induced contractures in MH-susceptible muscle.
- Increases in muscle twitch tension were significantly delayed by diltiazem.
- Muscle exhaustion, observed in control groups, was prevented in diltiazem-treated specimens.
Conclusions:
- Diltiazem demonstrates significant potential in mitigating MH-related muscle hypercontractility and associated complications.
- Calcium channel blockade by diltiazem offers a promising therapeutic avenue for managing MH episodes.