What QRS duration is typically used to define a wide-complex tachycardia such as VT?

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Prepare for the Basic Arrhythmias and 12 Lead EKG Exam. Study with detailed explanations, flashcards, and multiple choice questions to understand arrhythmias better. Get ready for your exam!

Multiple Choice

What QRS duration is typically used to define a wide-complex tachycardia such as VT?

Explanation:
A wide-complex tachycardia is defined by a QRS duration of 120 milliseconds (0.12 seconds) or longer. The QRS duration reflects how long ventricular depolarization takes; normal QRS is typically up to about 100 ms, with some variation. When the QRS is 120 ms or more, it indicates that ventricular activation is slower or abnormal, which is common in ventricular tachycardia or in supraventricular tachycardias with aberrant conduction. This threshold helps distinguish wide-complex tachycardias from narrow-complex ones, which usually have a QRS duration less than 120 ms.

A wide-complex tachycardia is defined by a QRS duration of 120 milliseconds (0.12 seconds) or longer. The QRS duration reflects how long ventricular depolarization takes; normal QRS is typically up to about 100 ms, with some variation. When the QRS is 120 ms or more, it indicates that ventricular activation is slower or abnormal, which is common in ventricular tachycardia or in supraventricular tachycardias with aberrant conduction. This threshold helps distinguish wide-complex tachycardias from narrow-complex ones, which usually have a QRS duration less than 120 ms.

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