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Previous Volume 352:1594-1597 April 14, 2005 Number 15 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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One quarter to one third of patients with congestive heart failure have some form of intraventricular conduction abnormality that is manifested as an increased QRS duration on the electrocardiogram.^1,2 The most common pattern is left bundle-branch block. In patients with left bundle-branch block, electrical activation of the lateral aspect of the left ventricle can be substantially delayed in relation to that of the right ventricle and interventricular septum. Dyssynchronous electrical activation results in dyssynchronous contraction, which is mechanically inefficient. Regional myocardial workload is distributed unequally, and regional myocardial blood flow and metabolism may be altered. As a result, the left . . . [Full Text of this Article]

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