![]() ![]() These changes have been correlated with direct or indirect assessments of ventricular size or mass to establish electrocardiographic criteria for the diagnosis of hypertrophy. The principal electrocardiogram (ECG) changes associated with ventricular hypertrophy are increases in QRS amplitude and duration, changes in instantaneous and mean QRS vectors, abnormalities in the ST segment and T waves, and abnormalities in the P wave. As discussed below, distinctive P-wave abnormalities may occur in the absence of atrial hypertrophy or dilation.) It is doubtful whether enlargement occurs without hypertrophy, at least in chronic stable syndromes. Enlargement may be taken to imply an increase in chamber dimension, which may not be present in concentric hypertrophy. The 1978 Bethesda Conference favored use of the term enlargement, but hypertrophy is more commonly used in recent research reports, although not necessarily in textbooks. ![]() (Note: This report uses the term hypertrophy rather than enlargement. Its importance has increased in recent years with the recognition that hypertrophy can be reversed with therapy, and that by doing so, adverse clinical outcomes can be prevented or delayed. The detection and assessment of cardiac chamber hypertrophy has long been an important objective of clinical electrocardiography. Customer Service and Ordering Information.Stroke: Vascular and Interventional Neurology.Journal of the American Heart Association (JAHA).Circ: Cardiovascular Quality & Outcomes.Arteriosclerosis, Thrombosis, and Vascular Biology (ATVB). ![]()
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