caffeine/fever

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Caffeine stimulation of malignant hyperthermia-susceptible sarcoplasmic reticulum Ca2+ release channel.

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The altered caffeine sensitivity of malignant hyperthermia-susceptible (MHS) muscle contracture is one basis of the diagnostic test for this syndrome. To determine whether the Arg615-to-Cys615 mutation of the porcine sarcoplasmic reticulum (SR) Ca2+ release channel is directly responsible for this

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).

Fiber-type caffeine sensitivities in skinned muscle fibers from humans susceptible to malignant hyperthermia.

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BACKGROUND The response to contracture tests may depend upon the relative proportion of muscle fiber types within the muscle specimen. To determine whether a difference in fiber-type caffeine sensitivities exists between malignant hyperthermia susceptible (MHS) and malignant

Fever from caffeine.

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Since childhood, a 53-year-old women had developed chills, high-grade fever, myalgia, and cephalea after the ingestion of coffee, tea, cola beverages, and some oral "antiflu" compounds. Skin prick tests performed with all the implicated substances were negative. Single-blind oral challenges with

[Effect of chlorocresol vs caffeine on muscle contracture in malignant hyperthermia susceptible patients].

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The phenotype of susceptibility to malignant hyperthermia (MHS); can only be detected reliably by the in vitro caffeine-halothane contracture test (CHCT). Enhanced sensitivity of the calcium-induced calcium release mechanism is responsible for the exaggerated contracture response of skeletal muscle

Interaction between low dose-rate irradiation, mild hyperthermia and low-dose caffeine in a human lung cancer cell line.

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OBJECTIVE To investigate cell killing by means of low dose-rate irradiation (LDRI) combined with concurrent mild hyperthermia and to determine the effect of low-dose caffeine on this combination treatment. METHODS Human lung adenocarcinoma cells, LK87, were treated with LDRI (50 cGy/h) in

Dietary caffeine synergizes adverse peripheral and central responses to anesthesia in malignant hyperthermia susceptible mice

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Ryanodine receptor (RYR1) mutations confer stress-triggered malignant hyperthermia susceptibility (MHS). Dietary caffeine (CAF) is the most commonly consumed psychoactive compound by humans. CAF-triggered Ca²⁺ release and influences on skeletal muscle contractility are widely used as

Effects of caffeine, halothane, and 4-chloro-m-cresol on skeletal muscle lactate and pyruvate in malignant hyperthermia-susceptible and normal swine as assessed by microdialysis.

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BACKGROUND Skeletal muscle fibers from malignant hyperthermia (MH)-susceptible humans and swine are markedly more sensitive to ryanodine receptor (RyR1) agonists than those from normal individuals. Reproducible shifts in the dose-response of skeletal muscle to caffeine and halothane are the basis of

Increased sensitivity to 4-chloro-m-cresol and caffeine in primary myotubes from malignant hyperthermia susceptible individuals carrying the ryanodine receptor 1 Thr2206Met (C6617T) mutation.

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Malignant hyperthermia (MH) is an autosomal-dominant disorder of skeletal muscle, triggered by volatile anaesthetics and depolarizing muscle relaxants. The causative defect lies in the control of Ca(2+) release from the sarcoplasmic reticulum in skeletal muscle. Numerous mutations have been detected

[Malignant hyperthermia of Duchenne muscular dystrophy: application of clinical grading scale and caffeine contracture of skinned muscle fibers].

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Episodes of acute myoglobinuria or cardiac arrest were occasionally complicated in general anesthesia of patients with Duchenne or Becker muscular dystrophy (DMD/BMD). Whether these complications are malignant hyperthermia (MH) or not has several times been discussed. In the present study, we

A comparison of the caffeine halothane muscle contracture test with the molecular genetic diagnosis of malignant hyperthermia.

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Malignant hyperthermia (MH) is currently diagnosed by the caffeine-halothane contracture (CHC) test. In a previous study, this test was used to establish linkage between the human gene for MH susceptibility and the ryanodine receptor (RYR) gene. The current study extends the genetic linkage analysis

Metabolism of caffeine and theophylline in rats with malaria and endotoxin-induced fever.

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1. The effects of malaria infection due to Plasmodium berghei and Escherichia coli endotoxin-induced fever on the metabolism of orally-administered caffeine (CA: 10 mg/kg) to its primary metabolites (theobromine (TB), paraxanthine (PX) and theophylline (TH)) were studied in 5-week-old male Wistar

The sensitivity and specificity of the caffeine-halothane contracture test: a report from the North American Malignant Hyperthermia Registry. The North American Malignant Hyperthermia Registry of MHAUS.

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BACKGROUND The caffeine-halothane contracture test (CHCT) is the only recognized laboratory test to diagnose malignant hyperthermia (MH). The authors report the results of their analysis of pooled data from the North American Malignant Hyperthermia Registry database to determine the sensitivity and

Effects of p53 Status of Tumor Cells and Combined Treatment With Mild Hyperthermia, Wortmannin or Caffeine on Recovery From Radiation-Induced Damage.

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Background

The aim of the study was to examine the dependency of p53 status and the usefulness of mild hyperthermia (MHT) as an inhibitor of recovery from radiation-induced damage, referring to the response of quiescent (Q) tumor cell

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