If the AV Node Is Damaged So That It Can

question 13

Multiple Choice

If the AV node is damaged so that it can no longer transmit the signal from the SA node (total heart block) , will the ventricles continue to contract? Why or why not?

• A)Yes: the AV bundle will keep the heart going at the usual rate.
• B)Yes: however, ventricular contractions will no longer follow atrial contractions, and the rate of ventricular contractions will be significantly slowed.
• C)No: there are no cells left to pace and coordinate the heart beat.
• D)No: the SA node must be intact to pace the system.

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Definitions:

MPG

Miles per gallon, a measure of fuel efficiency in vehicles.

Matched Samples

A study design where subjects are paired based on certain characteristics to ensure comparability between treatment groups.

Independent Samples

Two or more sets of data that are collected independently of each other, not affecting one another.

Confidence Interval

A range of values, derived from sample statistics, that is believed to contain the true value of a population parameter with a certain level of confidence.