Correct Answer: C

Rationale: The correct answer is C. Insulin should not be stored in the refrigerator at all times; it should be kept at room temperature when in use to avoid irritation at the injection site. Storing insulin in the refrigerator can cause it to thicken and may lead to discomfort upon injection. Choices A and D are correct statements as injecting insulin into the abdomen for faster absorption and rotating injection sites to prevent lipodystrophy are appropriate insulin administration techniques. Therefore, the client does not need further teaching on these aspects.

Correct Answer: B

Rationale: The correct answer is B: applying a prosthetic device. Home health aides are trained and authorized to assist with the application and management of prosthetic devices for clients. Evaluating a pressure sore (choice A) requires clinical assessment and judgment typically performed by a licensed healthcare provider such as a nurse. Performing a sterile dressing change (choice C) involves aseptic technique and wound care skills that are usually performed by licensed healthcare professionals. Assessing the client's need for an elevated toilet seat (choice D) involves a level of assessment and decision-making that is beyond the scope of practice for a home health aide.

Correct Answer: D

Rationale: The correct answer is D. Chest pain radiating to the left arm can be a sign of myocardial infarction (heart attack) and requires immediate intervention. This symptom is known as a classic presentation of a heart attack and warrants urgent medical attention to prevent further cardiac damage. Choices A, B, and C are not directly indicative of an acute cardiac event and may not require immediate intervention in this scenario. While heart rate, blood pressure, and respiratory rate are important vital signs to monitor, they do not specifically indicate the urgency associated with chest pain radiating to the left arm in a patient with a history of coronary artery disease.

Correct Answer: C

Rationale: In a client with COPD receiving oxygen therapy, an effective response is indicated by a respiratory rate of 20 breaths per minute. This suggests that the client is effectively oxygenating while maintaining an appropriate respiratory rate. Choices A, B, and D are incorrect because expectorating secretions easily, having an oxygen saturation of 92%, and arterial blood gases showing a pH of 7.35 are not specific indicators of the effectiveness of oxygen therapy in COPD. Oxygen saturation of 92% may still be suboptimal in COPD, and arterial blood gases showing a pH of 7.35 may not necessarily reflect the overall effectiveness of oxygen therapy.

Correct Answer: D

Rationale: After hemodialysis, muscle cramps can indicate an electrolyte imbalance, such as low potassium or magnesium levels, which requires immediate intervention to prevent potential complications like cardiac arrhythmias. Weight gain of 1 pound, dizziness, and fatigue are common post-hemodialysis symptoms that may not necessarily require immediate intervention unless they are severe or persisting.