Correct Answer: C

Rationale: The correct action when unable to distinguish the point of the first sound during blood pressure measurement is to deflate the cuff to zero and wait 30 to 60 seconds before reattempting the reading. This allows blood flow to return to the extremity, ensuring a more accurate reading the second time. It is important to ensure that the cuff is fully deflated and the appropriate wait time is given to obtain an accurate blood pressure measurement.

Correct Answer: D

Rationale: When encountering a client in distress, the nurse's initial response should be to communicate with the client to assess the situation and provide support. By talking to the client and attempting to find out the reason for their distress, the nurse can offer appropriate assistance and ensure the client's well-being. This action prioritizes the client's emotional needs and helps establish a therapeutic relationship, which is essential in nursing care.

Correct Answer: C

Rationale: Measuring the stoma using a stoma guide (C) is crucial as it ensures that the appliance fits properly, which is essential for preventing skin irritation and leakage. Proper measurement helps in selecting the right size of the appliance, promoting comfort and optimal stoma care. In contrast, cleansing with hydrogen peroxide (A), applying a moisture barrier cream (B), and using a dry gauze pad (D) are important but not as critical as ensuring the correct fit of the stoma appliance.

Correct Answer: A

Rationale: Troponin is the most specific and sensitive laboratory test for detecting myocardial infarction (MI). It is released when there is damage to the heart muscle, making it a valuable marker for diagnosing another MI. Myoglobin and CK-MB can also be elevated in MI, but troponin is preferred due to its higher specificity. C-reactive protein is a marker of inflammation and not specific to MI.

Correct Answer: C

Rationale: In this situation, the nurse should respond by calmly reassuring the client that the discomfort from the IV insertion will be temporary. By providing reassurance and addressing the client's concerns, the nurse can help reduce the client's apprehension and create a more supportive environment for the procedure.