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Lack Of Prophylactic Or Therapeutic Efficacy Of 5-HT2A Receptor Antagonists In Halothane-induced Porcine Malignant Hyperthermia

Wolfgang Löscher, Christoph Gerdes, Angelika Richter
Published 1994 · Chemistry, Medicine
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During halothane-induced malignant hyperthermia (MH), plasma levels of serotonin (5-hydroxytryptamine, 5-HT) increase in pigs. Administration of 5-HT agonists which stimulate the 5-HT2A subreceptor triggers MH in susceptible pigs. A possible link between MH induced by 5-HT2A receptor agonists and halothane could be an increase of second messengers such as phosphoinositides (inositol polyphosphates), which have recently been implicated in the abnormal regulation of skeletal muscle calcium release in MH. If so, antagonists of 5-HT2A receptors which are linked to phosphoinositide turnover should, be capable of preventing, retarding or attenuating halothane-induced MH. This possibility was investigated in the present study in MH susceptible pigs, using dantrolene for comparison. Development of MH triggered by a halothane challenge (inhalation of 3% halothane for 15 min) was completely prevented by dantrolene, 3.5 mg/i.v., whereas the 5-HT2A receptor antagonists ritanserin (0.5–10 mg/kg i.v.) or ketanserin (0.5–10 mg/kg i.v.) exerted no prophylactic effect. In pigs in which dantrolene, ritanserin or ketanserin where given in combination with hyperventilation after development of MH, dantrolene exerted therapeutic efficacy, whereas neither ritanserin nor ketanserin were effective treatments. The data indicate that 5-HT is not critically involved in the mechanisms of halothane-induced MH, at least under the conditions of the present experimental study.
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