Sometimes medications can cause conduction delay because of indirect effects on the heart and generally that is considered safe. There are, however, some patients who have enlargement of the right heart as a cause for this, such as having an atrial septal defect resulting in enlargement of the right ventricle or perhaps partial anomalous pulmonary venous drainage of some of the pulmonary veins return to the right side instead of the left side. The most common cause of this is just being a normal variant, in other words, there is nothing wrong with the heart. In general, “ conduction delay ” refers to a slight widening of the QRS complex, especially in the right precordial leads (leads V1, V2, and V3) it is sometimes also called incomplete right bundle branch block. Families and physicians often wonder what the terms“intraventricular conduction delay” (IVCD) or “incomplete right bundle branch block” (IRBBB) or “rsR’” on an electrocardiogram mean and what to do with the information.Įlectrocardiograms (abbreviated as “ECG” or “EKG”) are routinely done and best suited to the evaluation of heart rhythm, but we can sometimes infer potential heart disease or issues such as chamber enlargement or heart malformations from looking at the electrocardiogram, but the problem with this is that there are many false positives (that is, the EKG is abnormal but the patient’s heart is actually normal).
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