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Attenuation of serotonin–induced contractures in skeletal muscle from malignant hyperthermia–susceptible patients with dantrolene
Author(s) -
WAPPLER F.,
SCHOLZ J.,
RlCHTHOFEN V. VON,
FlEGE M.,
KÖCHLING A.,
LAMBRECHT W.,
ESCH J. SCHULTE AM
Publication year - 1997
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1997.tb04650.x
Subject(s) - dantrolene , malignant hyperthermia , muscle contracture , medicine , contracture , skeletal muscle , serotonin , endocrinology , anesthesia , receptor , anatomy , surgery , calcium
Background : Porcine malignant hyperthermia (MH) can be triggered by administration of certain serotonin 2 receptor agonists. Pretreatment with dantrolene completely abolished serotonininduced MH. The purpose of this study was to investigate the effects of the serotonin 2 receptor agonist l–(2,5–dimethoxy–4–iodophenyl)–2–aminopropane (DOI) in skeletal muscle specimens from MH–susceptible (MHS) and MH–nonsusceptible (MHN) patients following pretreatment with dantrolene. Results : Administration of DOI 0.02 mM induced contractures in muscle specimens from MHS and MHN patients. Contracture development started significantly earlier in MHS than in MHN specimens. In MHS muscle the maximum contracture was significantly greater than in MHN. Pretreatment with dantrolene significantly delayed the start of contracture development in MHS muscles, whereas in MHN muscles no contractures were observed after dantrolene. The contracture maximum was significantly reduced in MHS. Conclusion : The acceleration of DOI–induced contracture development in skeletal muscle specimens from MHS patients indicates that an altered serotonin system might be involved in human MH. Dantrolene effectively delayed serotonin–induced contractures. Further investigations are needed to determine whether serotonin 2 receptors of skeletal muscle from MHS subjects are altered in function or structure, or whether this response is a secondary phenomenon. Method : We used muscle specimens surplus to diagnostic requirements from 12 MHS and 13 MHN patients in this study. In the first experiment, DOI 0.02 mM was added to the organ bath. In the second experiment, muscle specimens were preincubated with dantrolene 0.5 μM or 1.0 nM, respectively, for 10 min before DOI 0.02 mM was administered.