The QRS time-interval maximum is which value?

The QRS time-interval maximum is which value?

• A. 0.08 seconds
• B. 0.16 seconds
• C. 0.12 seconds - max
• D. 0.20 seconds

Answer: (C)

QRS duration reflects how long it takes for the ventricles to depolarize. In a healthy adult, this interval is normally up to about 0.12 seconds (120 milliseconds). That makes 0.12 seconds the maximum normal value. A shorter QRS, like 0.08 seconds, is still normal but not the maximum. Longer intervals, such as 0.16 or 0.20 seconds, indicate a conduction delay within the ventricles (for example, a bundle branch block or other intraventricular conduction abnormality).

QRS duration reflects how long it takes for the ventricles to depolarize. In a healthy adult, this interval is normally up to about 0.12 seconds (120 milliseconds). That makes 0.12 seconds the maximum normal value. A shorter QRS, like 0.08 seconds, is still normal but not the maximum. Longer intervals, such as 0.16 or 0.20 seconds, indicate a conduction delay within the ventricles (for example, a bundle branch block or other intraventricular conduction abnormality).