![]() ![]() It may be a sign of worsening heart conditions. ![]() The distortion usually is not enough to make diagnosing a heart attack difficult. It may also be caused as a result of a heart procedure.Ī block of the right bundle branch may cause an electrocardiogram to be distorted. It can also occur in people who have another underlying heart or lung problem. It may occur with natural degeneration of the hearts conduction system that occurs with age. Right bundle block happens more often in older people. This can cause the heart to eject slightly less blood. Because of this, the right ventricle contracts a little later than it normally would. ![]() The signal still gets to the right ventricle, but it is slowed down, compared to the left bundle. The electrical signal can't travel down this path the way it normally would. In right bundle branch block, there is a problem with the right branch of the conducting system that sends the electrical signal to the right ventricle. If it happens with a heart attack, it can be a sign of serious heart muscle damage. The muscle fibers that carry the signal from the atrioventricular node go into the wall that divides the ventricles and then splits into two branches, the bundle branches.Ī block in the right bundle branch can occur in people who otherwise seem normal. Shortly after the sinoatrial node releases its signal, it is received by the atrioventricular node, which in turn sends a signal to the ventricles causing them to contract and pump blood out of the heart. It creates an electrical signal that travels through the heart muscle fibers and causes the atria to contract and pump blood into the lower chambers. The master pacemaker of the heart is the sinoatrial node, a small mass of muscle cells at the top of the right chamber (atrium) of the heart. All rights reserved.A bundle branch block is either a complete or a partial interruption of the electrical pathways inside the wall of the heart between the two lower chambers (ventricles). A detailed study of the ECG and noninvasive study of ventricular electrical activation may enable clinicians to better identify patients with NICD who will respond to CRT.Ĭardiac resynchronization therapy Nonspecific intraventricular conduction delay Prognosis QRS morphology.Ĭopyright © 2015 Heart Rhythm Society. A dedicated prospective study is therefore warranted for this question to be answered properly. Guidelines recommending implantation of CRT devices in this group are based solely on analyses of subgroups with small sample sizes. Unfortunately, prospective studies are lacking. Results from CRT are contradictory in this patient group, despite a seemingly neutral trend. Conduction pathways can be either healthy or affected. NICD is most often associated with cardiomyopathy (eg, ischemic or hypertensive). Less studied than RBBB or LBBB, its pathophysiology is both complex and varied yet still reflects intramyocardial conduction delay. However, a large proportion of heart failure patients present with a widened QRS that is neither an LBBB nor a right bundle branch block (RBBB): nonspecific intraventricular conduction delay (NICD). CRT was initially developed to treat patients who had left bundle branch block (LBBB) and delayed activation of the lateral left ventricular wall. Dyssynchrony results in widening of the QRS complex on the electrocardiogram (ECG). It aims to correct the electrical dyssynchrony present in 30% to 50% of patients in this population. Cardiac resynchronization therapy (CRT) is an electrical treatment of heart failure with reduced ejection fraction and wide QRS. ![]()
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