[Education] cardiology pearl

amalmattu at comcast.net amalmattu at comcast.net
Mon May 3 09:18:01 EDT 2010

Sorry folks, I forgot to include the reference for the most recent cardiology pearl pertaining to QRS intervals. See below. It is from an "Expert Consensus Document" published recently in a few journals simultaneously in the cardiology literature. These revisions to standardized ECG criteria are done every several years. 

Here's the full pearl again: 

Slight revisions have been made in what is considered to be normal QRS duration. 
In children < 4yo, a normal QRS duration is < 90ms. 
In children 4-16yo, a normal QRS duration is < 100ms. 
Above the age of 16, a normal QRS duration is < 110m. 

Consider these numbers when evaluating patients for aberrant conduction (e.g. toxicologic reasons as well) and when defining conduction blocks. 

Surawicz B, Childers R, Deal BJ, et al. AHA/ACCF/HRS Recommendations for the standardized interpretation of the electrocardiogram, Part III: Intraventricular conduction disturbances. A scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. J Am Coll Cardiol 2009;53(11):976-981. 
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