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:

Box Plot

A standardized way of displaying the distribution of data based on a five-number summary: minimum, first quartile, median, third quartile, and maximum.

Five Number Summary

A descriptive statistic that provides information about a set of observations through five key values: minimum, first quartile, median, third quartile, and maximum.

Measure Of Variability

A statistical indicator of how widely values in a data set vary around the mean or median.

Range

The difference between the highest and the lowest values in a data set.