what is the primary role of the sinoatrial sa node in the heart
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Nursing Elites

HESI LPN

HESI PN Exit Exam

1. What is the primary role of the sinoatrial (SA) node in the heart?

Correct answer: A

Rationale: The correct answer is A: Pacemaker of the heart. The SA node, known as the natural pacemaker, initiates the electrical impulses that set the rhythm for the heartbeat. It is responsible for coordinating the heart's contractions by generating electrical signals at regular intervals. Choice B is incorrect as the SA node's primary function is not related to blood pressure regulation. Choice C is incorrect as the SA node does not cause electrical conduction delay but rather initiates and conducts the electrical impulses. Choice D is incorrect as the SA node does not directly stimulate muscle contraction but rather initiates the electrical events that lead to muscle contraction.

2. A post-operative client is recovering from a total knee replacement and is prescribed patient-controlled analgesia (PCA). What is the primary advantage of PCA for managing post-operative pain?

Correct answer: A

Rationale: The primary advantage of PCA for managing post-operative pain is that it allows the client to control the administration of pain medication, leading to consistent pain control without overmedication. Choice B is incorrect as PCA does not eliminate the need for oral pain medication; it supplements it. Choice C is incorrect because while PCA can help reduce opioid consumption, it does not directly reduce the risk of opioid addiction. Choice D is incorrect as PCA actually requires close monitoring by nursing staff to ensure proper use and prevent complications.

3. When documenting information in a client's medical record, what should the nurse do?

Correct answer: D

Rationale: When documenting information in a client's medical record, the nurse should end each entry with their signature and title. This practice is crucial for legal and professional standards compliance as it ensures that the documentation is attributable to the responsible individual. Choices A, B, and C are incorrect because while crossing out errors, using a black ink pen, and leaving a blank line before each entry are good practices, they are not as critical as ensuring each entry is signed and titled by the nurse for accountability and traceability.

4. The UAP reports to the PN that an assigned client experiences SOB when the bed is lowered for bathing. Which action should the PN implement?

Correct answer: B

Rationale: Advising the UAP to allow the client to rest before completing the bath is the most appropriate action to take. This helps manage the shortness of breath (SOB) experienced by the client and prevents further stress. By giving the client time to rest, the PN ensures the client's comfort and safety during care activities. The other options are not the most immediate or appropriate actions in this scenario: obtaining further data about activity intolerance (choice A) may delay addressing the current issue, obtaining vital signs and pulse oximetry (choice C) is important but not as immediate as allowing the client to rest, and notifying the healthcare provider (choice D) is premature before trying a simple intervention like allowing the client to rest.

5. A client is post-operative day one following a colostomy surgery. The nurse notices the stoma is dark purple. What is the most appropriate action?

Correct answer: C

Rationale: A dark purple stoma may indicate compromised blood flow to the stoma, which is an emergency. Immediate notification of the healthcare provider is necessary to prevent further complications. Simply documenting and monitoring the finding (Choice A) could lead to delays in addressing a potentially serious issue. Applying warm compresses to the stoma (Choice B) may not address the underlying cause of the dark purple color. Encouraging the client to ambulate (Choice D) is not the priority when a compromised blood flow to the stoma is suspected.

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