ventricular fibrillation/tyrosine

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Tyrosine administration decreases vulnerability to ventricular fibrillation in the normal canine heart.

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Intravenous infusion of tyrosine (1, 2, or 4 milligrams per kilogram) for 20 to 30 minutes caused dose-dependent increases in the ventricular fibrillation threshold in normal dogs. Administration of valine, a neutral amino acid that competes with tyrosine for uptake at the blood-brain barrier, in a

Involvement of tyrosine kinase in peroxynitrite-induced preconditioning in rat isolated heart.

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We have investigated the role of tyrosine kinase in the antiarrhythmic effects of peroxynitrite preconditioning in rat isolated heart by using a tyrosine phosphatase inhibitor, sodium orthovanadate, and tyrosine kinase inhibitors, genistein and tyrphostin. Rat hearts were preconditioned by

Antiarrhythmic effect of reducing myocardial noradrenaline stores with alpha-methyl-meta-tyrosine.

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In the adrenergic neurons the amino acid alpha-methyl-meta-tyrosine (alpha-MmT) is converted to metaraminol via the noradrenaline (NA) synthetic pathway. Metaraminol thereby displaces NA from its neuronal stores, and as a consequence NA levels can be drastically reduced, although normal sympathetic

Control of ventricular fibrillation after coronary artery occlusion via intracerebroventricular injections.

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The central nervous system (CNS) may play a larger role than previously thought in the development of ventricular fibrillation after coronary artery occlusion. The probability of ventricular fibrillation after complete, permanent occlusion of the left anterior descending coronary artery was 52% in

Sudden ventricular fibrillation and death during ibrutinib therapy-A case report.

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Ibrutinib is an oral inhibitor of Bruton tyrosine kinase approved for the treatment of chronic lymphocytic leukaemia, mantle cell lymphoma and refractory Waldenstrom's disease. It increases progression-free survival, overall survival, response rate. The most frequent adverse reactions, are increased

Carotid baroreceptor stimulation suppresses ventricular fibrillation in canines with chronic heart failure.

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Carotid baroreceptor stimulation (CBS) has been shown to improve cardiac dysfunction and pathological structure remodelling. This study aimed to investigate the effects of CBS on the ventricular electrophysiological properties in canines with chronic heart failure (CHF). Thirty-eight beagles were

Desipramine pretreatment improves sympathetic remodeling and ventricular fibrillation threshold after myocardial ischemia.

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Abnormal increase in sympathetic nerve sprouting was responsible for the ventricular arrhythmogenesis after myocardial infarction. This study investigated whether the norepinephrine transporter inhibitor, desipramine, can modulate sympathetic remodeling and ventricular fibrillation threshold (VFT)

Sympathetic nerve sprouting, electrical remodeling, and increased vulnerability to ventricular fibrillation in hypercholesterolemic rabbits.

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Whether hypercholesterolemia (HC) can induce proarrhythmic neural and electrophysiological remodeling is unclear. We fed rabbits with either high cholesterol (HC, n=10) or standard (S, n=10) chows for 12 weeks (protocol 1), and with HC (n=12) or S (n=10) chows for 8 weeks (protocol 2). In protocol

Inhibition of c-Src tyrosine kinase prevents angiotensin II-mediated connexin-43 remodeling and sudden cardiac death.

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OBJECTIVE The aim of this study was to test whether c-Src tyrosine kinase mediates connexin-43 (Cx43) reduction and sudden cardiac death in a transgenic mouse model of cardiac-restricted overexpression of angiotensin-converting enzyme (ACE8/8 mice). BACKGROUND Renin-angiotensin system activation is

Renal denervation ameliorates the risk of ventricular fibrillation in overweight and heart failure.

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Both obesity and heart failure (HF) are associated with sudden cardiac death. The current study aimed to investigate the effects of overweight and HF on the substrate for ventricular fibrillation (VF), and whether renal denervation (RDN) can protect the heart from sympathetic

Gamma-irradiated ceruloplasmin affords antifibrillatory protection against ischemia/reperfusion damage in the isolated rat heart.

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OBJECTIVE Ceruloplasmin (CP), an important serum antioxidant, was previously found to reduce the incidence of ventricular fibrillation (VF) induced by ischemia and reperfusion in isolated rat hearts. The present study investigated whether CP sterilized by gamma-irradiation maintains its

Endothelin receptors, localized in sympathetic nerve terminals of the heart, modulate norepinephrine release and reperfusion arrhythmias.

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Endothelin (ET)-1 is an endogenous vasoconstrictor which modulates norepinephrine (NE) release in myocardial ischemia reperfusion. Recent studies have demonstrated the pro- or anti-arrhythmic effects in reperfusion. The present studies were undertaken to test the hypothesis that ET receptors located

Therapeutic hypothermia attenuates brain edema in a pig model of cardiac arrest: Possible role of the angiopoietin-Tie-2 system.

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OBJECTIVE This study aimed to clarify whether therapeutic hypothermia protects against cerebral edema following cardiac arrest (CA) and cardiopulmonary resuscitation (CPR) in a porcine model via regulating the angiopoietin-Tie-2 ligand-receptor system. METHODS Male pigs were randomized into the

Detoxification with hemabsorption after cardiac arrest does not improve neurologic recovery. Review and outcome study in dogs.

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We and others hypothesized that noxious substances released after prolonged cardiac arrest from malfunctioning liver, kidneys, or intestine (e.g. bacterial toxins, aromatic amino acids), might hamper recovery of the brain. The highly detoxifying effect of hemabsorption (i.e. hemoperfusion) with

Experimental studies of psychophysiological factors in sudden cardiac death.

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Earlier research in the field of sudden cardiac death is reviewed. Such studies have largely oriented towards the provocation of myocardial injury and asystole in normal animals. However, such investigations constitute an inadequate model to describe the clinical appearance of sudden death, where

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