Sinus Exit Block and Sinus Arrest Result in Similar ECG

question 39

Multiple Choice

Sinus exit block and sinus arrest result in similar ECG tracings. The distinguishing factor is that in sinus exit block, the:

• A)QRS is slightly wider than normal.
• B)P waves are inverted or entirely absent.
• C)pause duration is usually greater than 6 seconds.
• D)pause duration is a multiple of the R-R or P-P interval.

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Definitions:

Sphygmomanometer

A medical instrument used to measure blood pressure, typically consisting of an inflatable cuff to restrict blood flow and a mercury or aneroid manometer to measure pressure.

Systolic Pressure

The highest blood pressure level reached during the heartbeat cycle when the heart muscle contracts.

Radial Pulse

The pulse felt on the radial artery of the wrist, commonly used to measure heart rate.

Cardiac Output

The volume of blood pumped by the heart per minute, an important measure of heart function and efficiency.