A client suffers a myocardial infarction of the right atrium. The nurse notices that the client is in an irregular heart rhythm. From this information, the nurse infers there is a disturbance of which node of the cardiac conduction system?
1. Internodal pathway
2. Sinoatrial (SA) node
3. Atrioventricular (AV) node
4. Bundle of His
Correct Answer: 2
Rationale 1: The internodal pathway carries an action potential from the SA node to the AV node.
Rationale 2: The SA node is located in the tissue of the wall of the right atrium. Its function can be impaired after a right atrial infarction.
Rationale 3: The AV node sits between the atria and ventricles, and is not typically affected by a right atrial infarction.
Rationale 4: The bundle of His is located just below the AV node. It is not typically damaged during an infarction of the right atrium.
Global Rationale: The SA node is located in the tissue of the wall of the right atrium. Its function can be impaired after a right atrial infarction. The internodal pathway carries an action potential from the SA node to the AV node. The AV node sits between the atria and ventricles, and is not typically affected by a right atrial infarction. The bundle of His is located just below the AV node. It is not typically damaged during an infarction of the right atrium.
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