what is the primary role of the sinoatrial sa node in the heart
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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. What disorder closely matches Suzy's symptoms?

Correct answer: B

Rationale: Suzy's symptoms are characteristic of Borderline Personality Disorder (BPD). BPD includes instability in relationships, self-image, and emotions, as well as impulsivity and self-harm. Choice A, Antisocial personality disorder, is characterized by a disregard for others' rights and lack of empathy, which does not align with Suzy's symptoms. Schizoid personality disorder, choice C, is characterized by a lack of interest in social relationships, which is not a prominent feature in Suzy's case. Dissociative Identity Disorder, choice D, involves the presence of two or more distinct identities or personality states, which is not reflected in Suzy's symptoms.

3. A client post-coronary artery bypass graft (CABG) surgery is concerned about the risk of infection. What is the most important preventive measure the nurse should emphasize during discharge teaching?

Correct answer: D

Rationale: The correct answer is D: 'Keep the incision sites clean and dry.' After CABG surgery, maintaining the cleanliness and dryness of the incision sites is crucial to prevent infections. This practice reduces the risk of introducing harmful microorganisms to the surgical wound, promoting healing and preventing complications. Option A, while important, does not fully encompass the preventive measures necessary to avoid infections post-surgery. Option B is significant if antibiotics are prescribed, but ensuring cleanliness directly addresses infection prevention. Option C is reactive and focuses on addressing infection after it occurs, rather than proactively preventing it.

4. The nurse enters a male client's room to administer routine morning medications, and the client is on the phone. Which action is best for the nurse to take?

Correct answer: B

Rationale: The best action for the nurse to take in this situation is to wait for the client to excuse himself from the telephone conversation and then observe the client taking the medication. This approach ensures that the client takes the medication as prescribed, promoting compliance and safety. Choice A is not ideal as it involves unnecessary delegation and may lead to confusion. Choice C is incorrect because assuming refusal without direct communication can compromise patient care. Choice D is not recommended as leaving the medication with the client unsupervised may result in non-compliance or potential errors.

5. Which action should the PN implement when using standard precautions to provide client care?

Correct answer: B

Rationale: The correct answer is B. When using standard precautions, healthcare providers should wear clean exam gloves to perform perineal catheter care. This approach helps prevent the transmission of pathogens and ensures the safety of both the client and the healthcare provider. Choice A is incorrect because applying sterile gloves for a finger stick blood sample is unnecessary when non-sterile gloves would suffice. Choice C is incorrect because replacing the needle cap after giving an intramuscular injection is not directly related to standard precautions. Choice D is incorrect because wearing a paper gown is not a standard precaution for preventing the transmission of droplet pathogens.

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