Why Is a Prolonged QT Interval Associated with Life-Threatening Heart

question 15

Multiple Choice

Why is a prolonged QT interval associated with life-threatening heart rhythm disturbances?

• A) It is associated with a longer vulnerable period.
• B) Calcium influx is the greatest during this period.
• C) The SA node becomes refractory to the normal depolarization.
• D) This period is refractory to AV depolarization.

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