cardiovascular disorders
Cardiac Resynchronization Therapy (CRT)
Introduction
The need for treatment of Overview of Arrhythmias depends on the symptoms and the seriousness of the arrhythmia. Treatment is directed at causes. If necessary, direct antiarrhythmic therapy, including In some patients, the normal, orderly, sequential relationship between contraction of the cardiac chambers is disrupted (becomes dyssynchronous). Dyssynchrony may be Atrioventricular: Between atrial and ventricular contraction Interventricular: Between left and right ventricular contraction Intraventricular: Between different segments of left ventricular contraction Patients at risk for dyssynchrony include those with the following: Ischemic or nonischemic Dilated Cardiomyopathy None 130 millisecond) particularly in the form of typical Bundle Branch Block and Fascicular Block None Left ventricular end-diastolic dimension≥55 mm Left ventricular ejection fraction≤35% in sinus rhythm Cardiac dyssynchrony can be suspected based on electrocardiogram (ECG) parameters (eg, left bundle branch block) and advanced echocardiography techniques (eg, tissue Doppler index, strain rate). Cardiac resynchronization therapy (CRT) involves use of a Cardiac Pacemakers to resynchronize cardiac contraction. Such systems usually include a right atrial lead, right ventricular lead, and left ventricular lead. Leads may be placed transvenously or surgically via thoracotomy. In patients with Heart Failure (HF) who have New York Heart Association (see table 