Heart & Cardiology/wide QRS

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Question
Why is a wide QRS complex defined as greater than .12 seconds for an adult but only .09 seconds for a pediatric?

Answer
Hi,

The common thought is that this is primarily due to cardiac size (and possibly the relative tachycardia), which would also explain the linear increase in conduction interval as age progresses through to adolescence. There is progressive change in QRS interval with age. Normal range from about 7085 ms in neonates and 90110 ms in adolescents. Relatively little change is seen in the first three years. After that QRS duration increases in a lineal fashion in to adolescence.

Hope that was helpful,  

Heart & Cardiology

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Mustafa Ahmed MD

Expertise

Cardiology, Interventional Cardiology, Cardiac Surgery, Hypertension, Pulmonary Embolism, Structural and Valve Disease

Experience

Board Certification Internal Medicine and Cardiology Interventional and Structural Cardiology

Organizations
http://blog.myheart.net

Publications
Multiple Publications In High Quality Peer Reviewed Journals. Internationally Recognized.

Education/Credentials
MD from The Royal Victoria University of Manchester, England Medicine, Cardiology, Interventional Cardiology, Research Training - University of Alabama

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