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contracture/fever
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Comparison of the caffeine skinned fibre tension (CSFT) test with the caffeine-halothane contracture (CHC) test in the diagnosis of malignant hyperthermia.
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We have compared and contrasted two diagnostic tests for Malignant Hyperthermia (MH) - the Caffeine-Halothane Contracture Test and the Caffeine Skinned Fibre Tension Test. Both tests show a strongly positive relationship both with the occurrence of MH reactions and with each other. The former test
Caffeine and halothane contracture testing in swine using the recommendations of the North American Malignant Hyperthermia Group.
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Caffeine and halothane contracture testing is widely used to detect malignant hyperthermia (MH) susceptibility. The accuracy and reliability of the 3% halothane test and the incremental caffeine test, as recommended by the North American MH Group, were assessed in 11 swine (five MHS, six control).
Fura-2 detected myoplasmic calcium and its correlation with contracture force in skeletal muscle from normal and malignant hyperthermia susceptible pigs.
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Fura-2 was used to estimate myoplasmic [Ca2+] in intact intercostal muscle fibers from normal and malignant hyperthermia susceptible (MHS) pigs. Small muscle bundles (20-50 fibers) were loaded with the membrane-permeant form of the dye. Resting myoplasmic [Ca2+] were not significantly different in
[Diagnosis of malignant hyperthermia. The platelet test versus the in vitro contracture test].
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An eight-year-old boy was scheduled for an orthopaedic operation with a clinically abortive reaction of malignant hyperthermia and a positive platelet test result. Since there has been no validation for this platelet test, we performed a muscle biopsy and the caffeine- halothane-contracture test
No relationship between fiber type and halothane contracture test results in malignant hyperthermia.
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Previous studies in cat, rat, and swine have implicated fiber type as influencing the halothane and caffeine contracture test used to diagnose malignant hyperthermia (MH). The authors performed fiber type analysis using myosin ATPase stains on 31 fascicles of skeletal muscle from nine patients
[Ryanodine-induced contractures for the diagnosis of malignant hyperthermia susceptibility].
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The halothane-caffeine contracture test is presently the most well-established method for identification of malignant hyperthermia susceptibility (MHS) or non-susceptibility (MHN). However, 10-20% of the patients tested are classified as equivocal (MHE), i.e. their susceptibility remains uncertain.
Comparison of North American and European malignant hyperthermia group halothane contracture testing protocols in swine.
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Different in vitro halothane testing procedures have been used in the European malignant hyperthermia (MH) Group Protocol (EMHGP) and the North American MH Group Protocol (NAMHGP), whereas the caffeine-testing protocols are very similar. The present study compares the two halothane-testing protocols
Changes in ryanodine-induced contractures by stimulus frequency in malignant hyperthermia susceptible and malignant hyperthermia nonsusceptible dog skeletal muscle.
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Elective diagnosis of malignant hyperthermia depends on halothane and caffeine contracture testing of biopsied skeletal muscle. Ryanodine-induced contractures may provide greater sensitivity and specificity for malignant hyperthermia (MH) diagnosis. This study investigated the effects of ryanodine
An analysis of the predictive probability of the in vitro contracture test for determining susceptibility to malignant hyperthermia.
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An objective estimate of the likelihood of correct designation of malignant hyperthermia (MH) susceptibility from in vitro contracture test (IVCT) results is essential if genetic linkage studies of MH are to be more informative. The aim of this study was to generate and test statistical models that
[Diagnosis of susceptibility to malignant hyperthermia using the in vitro contracture test].
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Though a malignant hyperthermia (MH) crisis is still a critical event during general anesthesia, recent developments in prophylaxis and treatment should help in avoiding fatal episodes. The best means to avoid MH episodes would be early recognition of MH susceptibility. Today the only reliable test
Effect of Bay K 8644 on the magnitude of isoflurane and halothane contracture of skeletal muscle from patients susceptible to malignant hyperthermia.
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Isoflurane has a lesser ability than halothane to induce contracture in malignant hyperthermia (MH) muscle in vitro. This does not necessarily imply that isoflurane is not as potent an MH trigger as halothane in vivo. A hypothesis was tested that in vitro treatment with Bay K 8644, an activator of
W-7, a calmodulin antagonist, and contracture of malignant hyperthermia susceptible skeletal muscle.
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1. In malignant hyperthermia susceptible muscle fibers, the calmodulin antagonist, W-7 (10 microM), evoked contractures and potentiated halothene (3%) induced contracture. No effect was seen at 0.1 or 1.0 microM) W-7. 2. Dantrolene sodium (6 microM) prevented and reversed W-7 induced contracture:
Results of in vitro contracture testing of both parents of malignant hyperthermia susceptible probands.
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BACKGROUND
Malignant Hyperthermia (MH) is regarded as a dominantly inherited condition. Therefore, most investigators do not test the second parent if the first parent is found to be MH susceptible (MHS). The purpose of this study was to validate this policy.
METHODS
In vitro contracture tests
Cumulative and bolus in vitro contracture testing with 4-chloro-3-ethylphenol in malignant hyperthermia positive and negative human skeletal muscles.
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In this study we evaluated the in vitro effects of 4-chloro-3-ethylphenol (CEP) using cumulative (12.5-200 micromol/L) or bolus (75 and 100 micromol/L) administrations, on muscle specimens from malignant hyperthermia (MH) susceptible and MH nonsusceptible patients, respectively. In the cumulative
Diltiazem and nifedipine reduce the in vitro contracture response to halothane in malignant hyperthermia-susceptible muscle.
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The effects of diltiazem (1 microM) and nifedipine (1 microM) were examined separately on the in vitro halothane tests for malignant hyperthermia (MH) susceptibility. Eighteen patients with MH susceptibility were diagnosed as MH-susceptible (MHS) according to the protocol of the European MH Group.
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