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Dantrolene

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https://www.readbyqxmd.com/read/28079659/suspected-malignant-hyperthermia-in-the-setting-of-hypothermic-circulatory-arrest-for-type-a-aortic-dissection-repair-a-case-report
#1
Bryant Bunting, Joshua Knight, Stephen M McHugh
Malignant Hyperthermia (MH) is a life-threatening biochemical process of hypermetabolism brought about in susceptible individuals by a triggering drug or event. Type A aortic dissections are surgical emergencies requiring cardiopulmonary bypass and frequently deep hypothermic circulatory arrest. We present a case of suspected MH in a patient undergoing emergent repair of a type A aortic dissection. Upon arrival at our institution, the patient had multiple signs of MH. However, no known triggering agent had been administered...
January 11, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28079567/cardiac-calcium-release-channel-ryanodine-receptor-2-regulation-by-halogenated-anesthetics
#2
Derek R Laver, John Attia, Christopher Oldmeadow, Anthony W Quail
BACKGROUND: Halogenated anesthetics activate cardiac ryanodine receptor 2-mediated sarcoplasmic reticulum Ca release, leading to sarcoplasmic reticulum Ca depletion, reduced cardiac function, and providing cell protection against ischemia-reperfusion injury. Anesthetic activation of ryanodine receptor 2 is poorly defined, leaving aspects of the protective mechanism uncertain. METHODS: Ryanodine receptor 2 from the sheep heart was incorporated into artificial lipid bilayers, and their gating properties were measured in response to five halogenated anesthetics...
January 12, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28035645/reflex-arc-of-the-teeth-clenching-induced-pressor-response-in-rats
#3
Ichiro Shoji, Takehito Kemuriyama, Megumi Tandai-Hiruma, Satoshi Maruyama, Akimasa Tashiro, Hidetaka Yokoe, Yasuhiro Nishida
Although "teeth clenching" induces pressor response, the reflex tracts of the response are unknown. In this study, dantrolene administration inhibited teeth clenching generated by electrical stimulation of the masseter muscles and completely abolished the pressor response. In addition, trigeminal ganglion block or hexamethonium administration completely abolished the pressor response. Local anesthesia of molar regions significantly reduced the pressor response to 27 ± 10%. Gadolinium (mechanoreceptor blocker of group III muscle afferents) entrapment in masticatory muscles also significantly reduced the pressor response to 62 ± 7%...
December 29, 2016: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28027523/preparation-characterization-and-in-vivo-evaluation-of-a-formulation-of-dantrolene-sodium-with-hydroxypropyl-%C3%AE-cyclodextrin
#4
Mengmeng Chen, Qijuan Wu, Juan Jiang, Xin Jin, Shuang Liu, Miao Wang, Chunjie Zhao
Dantrolene sodium (Da) is an effective skeletal muscle relaxant. However, its pharmacological effects are severely limited owing to its poor solubility and low oral bioavailability. In order to solve these problems, an inclusion complex using hydroxypropyl-β-cyclodextrin (HP-β-CD) to improve the oral bioavailability of Da was prepared successfully by freeze-drying. The prepared complex was characterized by Powder X-ray diffractometry (PXRD), Fourier transform infrared spectroscopy (FTIR) and evaluated by a dissolution test and a pharmacokinetic study...
December 19, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27984222/succinylcholine-for-emergency-airway-rescue-in-class-b-ambulatory-facilities-the-society-for-ambulatory-anesthesia-position-statement
#5
Girish P Joshi, Meena S Desai, Steven Gayer, Hector Vila
Procedures in class B ambulatory facilities are performed exclusively with oral or IV sedative-hypnotics and/or analgesics. These facilities typically do not stock dantrolene because no known triggers of malignant hyperthermia (ie, inhaled anesthetics and succinylcholine) are available. This article argues that, in the absence of succinylcholine, the morbidity and mortality from laryngospasm can be significant, indeed, higher than the unlikely scenario of succinylcholine-triggered malignant hyperthermia. The Society for Ambulatory Anesthesia (SAMBA) position statement for the use of succinylcholine for emergency airway management is presented...
December 15, 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27939335/calcium-signalling-induced-by-in-vitro-exposure-to-silicium-dioxide-nanoparticles-in-rat-pulmonary-artery-smooth-muscle-cells
#6
Virginie Dubes, Thibaud Parpaite, Thomas Ducret, Jean-François Quignard, Stéphane Mornet, Nora Reinhardt, Isabelle Baudrimont, Mathilde Dubois, Véronique Freund-Michel, Roger Marthan, Bernard Muller, Jean-Pierre Savineau, Arnaud Courtois
The development and use of nanomaterials, especially engineered nanoparticles (NP), is expected to provide many benefits. But at the same time the development of such materials is also feared because of their potential human health risks. Indeed, NP display some characteristics similar to ultrafine environmental particles which are known to exert deleterious cardiovascular effects including pro-hypertensive ones. In this context, the effect of NP on calcium signalling, whose deregulation is often involved in hypertensive diseases, remain poorly described...
January 15, 2017: Toxicology
https://www.readbyqxmd.com/read/27918309/intraoperative-presentation-of-malignant-hyperthermia-confirmed-by-ryr1-gene-mutation-c-7522c-t-p-r2508c-leads-to-diagnosis-of-king-denborough-syndrome-in-a-child-with-hypotonia-and-dysmorphic-features
#7
Mark R Joseph, Mary C Theroux, James J Mooney, Shawn Falitz, Barbara W Brandom, Debra L Byler
We present the novel case report of a child with hypotonia and dysmorphic features who developed malignant hyperthermia (MH) intraoperatively. Neurology workup revealed the presence of a known causative ryanodine receptor (RYR1) mutation for MH, c.7522C>T; p.R2508C. Furthermore, the neurology workup diagnosed the child with King-Denborough syndrome (KDS). This particular mutation has never been documented in a patient with KDS. Atypical presentation of MH is more likely in patients with RYR1-related myopathy...
December 1, 2016: A & A Case Reports
https://www.readbyqxmd.com/read/27889824/erratum-to-counter-flow-suggests-transport-of-dantrolene-and-5-oh-dantrolene-by-the-organic-anion-transporters-2-oat2-and-3-oat3
#8
Birgitta C Burckhardt, Maja Henjakovic, Yohannes Hagos, Gerhard Burckhardt
No abstract text is available yet for this article.
November 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27882090/clinical-treatment-of-malignant-hyperthermia-in-three-cases
#9
Tao Pan, Wenli Ji, Mengqi Nie, Yang Li
Malignant hyperthermia (MH) is a rare life threatening inherited disorder that is triggered by drugs used for general anesthesia in susceptible persons. The symptoms include rapid increase of body temperature and severe muscle contractions. The present study includes 3 cases of MH and highlights the timely identification of symptoms for rescuing the patient. In case I, a 7-year-old male child underwent surgery with ketamine at a dose of 250 mg. After 4 h of operation, the child went through convulsions, high fever and succumbed within a few hours...
November 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27854207/long-term-oral-dantrolene-improved-muscular-symptoms-in-a-malignant-hyperthermia-susceptible-individual
#10
Brian N Butala, Audry Kang, Jasmeen Guron, Barbara W Brandom
This case report describes a female with p.Lys4876Arg amino acid change in the ryanodine receptor type 1 (RYR1) and a sibling who died of malignant hyperthermia (MH) during anesthesia. After her diagnosis as MH susceptible, this patient was administered low-dose dantrolene daily for greater than 25 years for treatment of chronic muscle spasm and pain in her lower extremities and back limiting sleep. Her creatine phosphokinase (CPK) was as high as 2390 IU/L during labor and 900 IU at rest. With 25 mg dantrolene daily, muscle cramps were eliminated, and sleep was improved...
March 3, 2016: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/27832686/dantrolene-a-selective-ryanodine-receptor-antagonist-protects-against-pentylenetetrazole-induced-seizure-in-mice
#11
Mojtaba Keshavarz, Morteza Fotouhi, Alireza Rasti
Ryanodine receptor abnormalities has implicated in the generation and maintenance of seizure. Dantrolene, a selective ryanodine receptor antagonist, may be a potential drug for the prevention of seizure. Therefore, we aimed to clarify the protective effects of dantrolene against pentylenetetrazole seizure in mice. Male albino mice were received an intra-peritoneal injection of pentylenetetrazole (80 mg/kg) in seven separate groups (n=8). We used dantrolene (10,20 and 40 mg/kg), caffeine (200 mg/kg), dantrolene (40 mg/kg) + caffeine (200 mg/kg), diazepam (5 mg/kg as a positive control) and vehicle 30 minutes before the injection of pentylenetetrazole...
September 2016: Acta Medica Iranica
https://www.readbyqxmd.com/read/27812757/counter-flow-suggests-transport-of-dantrolene-and-5-oh-dantrolene-by-the-organic-anion-transporters-2-oat2-and-3-oat3
#12
Birgitta C Burckhardt, Maja Henjakovic, Yohannes Hagos, Gerhard Burckhardt
Dantrolene is the only available drug for the treatment of malignant hyperthermia, a life-threatening inborn sensitivity of the ryanodine receptor (RyR1) in skeletal muscles to volatile anesthetics. Dantrolene is metabolized in the liver to 5-OH dantrolene. Both compounds are zwitterions or net negatively charged. Here, we investigated interactions of dantrolene and 5-OH dantrolene with solute carrier (SLC) family members occurring in skeletal muscle cells, hepatocytes, and renal proximal tubule cells. SLC22A8 (organic anion transporter 3, OAT3) was very sensitive to both compounds exhibiting IC50 values of 0...
November 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27792175/the-relationship-between-estrogen-and-nitric-oxide-in-the-prevention-of-cardiac-and-vascular-anomalies-in-the-developing-zebrafish-danio-rerio
#13
Benjamin G Sykes, Peter M Van Steyn, Jonathan D Vignali, John Winalski, Julie Lozier, Wade E Bell, James E Turner
It has been known that both estrogen (E2) and nitric oxide (NO) are critical for proper cardiovascular system (CVS) function. It has also been demonstrated that E2 acts as an upstream effector in the nitric oxide (NO) pathway. Results from this study indicate that the use of a nitric oxide synthase (NOS) inhibitor (NOSI) which targets specifically neuronal NOS (nNOS or NOS1), proadifen hydrochloride, caused a significant depression of fish heart rates (HR) accompanied by increased arrhythmic behavior. However, none of these phenotypes were evident with either the inhibition of endothelial NOS (eNOS) or inducible NOS (iNOS) isoforms...
October 26, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27776396/venous-thromboembolism-following-dantrolene-treatment-for-neuroleptic-malignant-syndrome
#14
Po-Hao Chen, Hsien-Yuan Lane, Chieh-Hsin Lin
Neuroleptic malignant syndrome (NMS) is one of the most severe iatrogenic emergencies in clinical service. The symptoms including sudden consciousness change, critical temperature elevation and electrolytes imbalance followed by mutli-organ system failure were common in NMS. In addition to aggressive interventions with intravenous fluid resuscitation and antipyretics, several antidotes have been suggested to prevent further progression of the muscle damage. Dantrolene has been reported to be one of the most effective treatments for NMS...
November 30, 2016: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27730362/dantrolene-improves-in-vitro-structural-changes-induced-by-serum-from-trypanosoma-cruzi-infected-mice
#15
Lygia M Malvestio, Mara Rúbia N Celes, Linda A Jelicks, Herbert B Tanowitz, Cibele M Prado
Dystrophin, an important protein of the dystrophin-glycoprotein complex, has been implicated in the pathogenesis of experimental Chagas disease. It is important for the maintenance of cell shape and contraction force transmission. Dystrophin loss has been related to end-stage cardiac myopathies and proposed as a common route for myocardial dysfunction and progression to advanced heart failure. Evidence suggests that calpains, calcium-dependent proteases, digest dystrophin when the calcium concentration is compatible with their activation...
January 2017: Parasitology Research
https://www.readbyqxmd.com/read/27721999/paliperidone-inducing-concomitantly-syndrome-of-inappropriate-antidiuretic-hormone-neuroleptic-malignant-syndrome-and-rhabdomyolysis
#16
Jaspinder Kaur, Dileep Kumar, Mostafa Alfishawy, Ricardo Lopez, Issac Sachmechi
Paliperidone, an active metabolite of risperidone, is a new atypical antipsychotic agent. Syndrome of inappropriate antidiuretic hormone (SIADH), neuroleptic malignant syndrome (NMS), and rhabdomyolysis are the uncommon side effects of psychotropic drugs. We report a case of 35-year-old male with schizoaffective disorder who was admitted for acute-on-chronic exacerbation of his psychotic disorder for which intramuscular paliperidone 234 mg injection was given. Two days later, the patient developed hyponatremic seizures secondary to SIADH which was treated with hypertonic saline...
2016: Case Reports in Critical Care
https://www.readbyqxmd.com/read/27717822/inhibiting-c-jun-n-terminal-kinase-partially-attenuates-caffeine-dependent-cell-death-without-alleviating-the-caffeine-induced-reduction-in-mitochondrial-respiration-in-c2c12-skeletal-myotubes
#17
R M Downs, M A Hughes, S T Kinsey, M C Johnson, B L Baumgarner
Caffeine is a widely consumed stimulant that has previously been shown to promote cytotoxic stress and even cell death in numerous mammalian cell lines. Thus far there is little information available regarding the toxicity of caffeine in skeletal muscle cells. Our preliminary data revealed that treating C2C12 myotubes with 5 mM caffeine for 6 h increased nuclear fragmentation and reduced basal and maximal oxygen consumption rate (OCR) in skeletal myotubes. The purpose of this study was to further elucidate the pathways by which caffeine increased cell death and reduced mitochondrial respiration...
October 4, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27650424/antiarrhythmic-effects-of-dantrolene-in-human-diseased-cardiomyocytes
#18
Nico Hartmann, Steffen Pabel, Jonas Herting, Felix Schatter, André Renner, Jan Gummert, Hanna Schotola, Bernhard C Danner, Lars S Maier, Norbert Frey, Gerd Hasenfuss, Thomas H Fischer, Samuel Sossalla
BACKGROUND: Cardiac type 2 ryanodine receptors (RyR2s) play a pivotal role in cellular electrophysiology and contractility. Increased RyR2-mediated diastolic sarcoplasmic reticulum (SR) Ca(2+) release is linked to heart failure (HF) and arrhythmias. Dantrolene, a drug used for the treatment of malignant hyperthermia, is known to stabilize RyRs in skeletal muscle. OBJECTIVE: The purpose of this study was to investigate the effects of dantrolene on arrhythmogenic triggers and contractile function in human atrial fibrillation (AF) and HF cardiomyocytes (CM)...
September 17, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27633384/clinical-protocol-for-the-management-of-malignant-hyperthermia
#19
A Kollmann-Camaiora, E Alsina, A Domínguez, B Del Blanco, M J Yepes, J L Guerrero, A García
Malignant hyperthermia is a hypermetabolic syndrome that appears in susceptible patients after exposure to certain anaesthetic drugs (succinylcholine, inhalation anaesthetics). Its incidence in Spain is 1 in 40,000 adults, with a 10% mortality rate. It is induced by an abnormal regulation of the ryanodine receptors, producing a massive release of calcium from the sarcoplasmic reticulum in the striate muscle. Clinical manifestations include: CO2 increase, tachycardia, haemodynamic instability, metabolic and respiratory acidosis, profuse sweating, hyperpyrexia, CPK increase, myoglobinuria, kidney failure, disseminated intravascular coagulation (DIC), and ending in cardiac arrest...
January 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/27626620/the-emerging-role-of-calmodulin-regulation-of-ryr2-in-controlling-heart-rhythm-the-progression-of-heart-failure-and-the-antiarrhythmic-action-of-dantrolene
#20
Kafa Walweel, Ye Win Oo, Derek R Laver
Cardiac output and rhythm depend on the release and the take-up of calcium from the sarcoplasmic reticulum (SR). Excessive diastolic calcium leak from the SR due to dysfunctional calcium release channels (RyR2) contributes to the formation of delayed after-depolarizations, which underlie the fatal arrhythmias that occur in heart failure and inherited syndromes. Calmodulin (CaM) is a calcium-binding protein that regulates target proteins and acts as a calcium sensor. CaM is comprised of two calcium-binding EF-hand domains and a flexible linker...
January 2017: Clinical and Experimental Pharmacology & Physiology
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