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Cardiac resynchronization therapy to prevent life-threatening arrhythmias in patients with congestive heart failure. 2011

Takashi Kurita, and Takashi Noda, and Takeshi Aiba, and Ikutaro Nakajima, and Wataru Shimizu, and Koichiro Motoki, and Ryobun Yasuoka, and Shunichi Miyazaki, and Shiro Kamakura
Department of Medicine, Division of Cardiology, Faculty of Medicine, Kinki University, Osaka, Japan. kuritat@med.kindai.ac.jp

Various clinical data demonstrate that cardiac resynchronization therapy (CRT) provides a favorable structural as well as electrical remodeling. The CArdiac Resynchronization-Heart Failure study, which tested the pure effect of CRT (using CRT devices without the capability of defibrillation) clearly showed a significant reduction in the total mortality by partly preventing sudden cardiac death. The antiarrhythmic effects of CRT are explained, at least in part, by ionic and genetic modulation of ventricular myocytes. It has been revealed in animal experiments to mimic disorganized ventricular contraction that CRT reverses down-regulation of certain K(+) channels and abnormal Ca(2+) homeostasis in the failing heart. However, CRT can be proarrhythmic in some particular cases especially in the early phase of this therapy. According to our study, proarrhythmic effects after CRT can be observed in approximately 10% of patients. The relatively high incidence of the proarrhythmic effects of CRT may promote a trend toward selecting CRT-D rather than CRT-P.

UI MeSH Term Description Entries
D008297 Male Males
D006333 Heart Failure A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION. Cardiac Failure,Heart Decompensation,Congestive Heart Failure,Heart Failure, Congestive,Heart Failure, Left-Sided,Heart Failure, Right-Sided,Left-Sided Heart Failure,Myocardial Failure,Right-Sided Heart Failure,Decompensation, Heart,Heart Failure, Left Sided,Heart Failure, Right Sided,Left Sided Heart Failure,Right Sided Heart Failure
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly
D001145 Arrhythmias, Cardiac Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction. Arrhythmia,Arrythmia,Cardiac Arrhythmia,Cardiac Arrhythmias,Cardiac Dysrhythmia,Arrhythmia, Cardiac,Dysrhythmia, Cardiac
D001281 Atrial Fibrillation Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation. Auricular Fibrillation,Familial Atrial Fibrillation,Paroxysmal Atrial Fibrillation,Persistent Atrial Fibrillation,Atrial Fibrillation, Familial,Atrial Fibrillation, Paroxysmal,Atrial Fibrillation, Persistent,Atrial Fibrillations,Atrial Fibrillations, Familial,Atrial Fibrillations, Paroxysmal,Atrial Fibrillations, Persistent,Auricular Fibrillations,Familial Atrial Fibrillations,Fibrillation, Atrial,Fibrillation, Auricular,Fibrillation, Familial Atrial,Fibrillation, Paroxysmal Atrial,Fibrillation, Persistent Atrial,Fibrillations, Atrial,Fibrillations, Auricular,Fibrillations, Familial Atrial,Fibrillations, Paroxysmal Atrial,Fibrillations, Persistent Atrial,Paroxysmal Atrial Fibrillations,Persistent Atrial Fibrillations
D017180 Tachycardia, Ventricular An abnormally rapid ventricular rhythm usually in excess of 150 beats per minute. It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. Depending on the etiology, onset of ventricular tachycardia can be paroxysmal (sudden) or nonparoxysmal, its wide QRS complexes can be uniform or polymorphic, and the ventricular beating may be independent of the atrial beating (AV dissociation). Idiopathic Ventricular Tachycardia,Nonsustained Ventricular Tachycardia,Paroxysmal Supraventricular Tachycardia,Ventricular Tachyarrhythmias,Ventricular Tachycardia,Idiopathic Ventricular Tachycardias,Nonsustained Ventricular Tachycardias,Paroxysmal Supraventricular Tachycardias,Supraventricular Tachycardia, Paroxysmal,Tachyarrhythmia, Ventricular,Tachycardia, Idiopathic Ventricular,Tachycardia, Nonsustained Ventricular,Tachycardia, Paroxysmal Supraventricular,Ventricular Tachyarrhythmia,Ventricular Tachycardia, Idiopathic,Ventricular Tachycardia, Nonsustained,Ventricular Tachycardias
D058406 Cardiac Resynchronization Therapy The restoration of the sequential order of contraction and relaxation of the HEART ATRIA and HEART VENTRICLES by atrio-biventricular pacing. Atrio-Biventricular Pacing,Biventricular Pacing,Cardiac Resynchronization,Cardiac Resynchronization Pacing Therapy,Resynchronization Pacing Therapy, Cardiac,Atrio Biventricular Pacing,Pacing, Atrio-Biventricular,Pacing, Biventricular,Resynchronization Therapy, Cardiac,Resynchronization, Cardiac,Therapy, Cardiac Resynchronization

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