Correct Answer: C

Rationale: The correct initial question to ask a patient with a positive tuberculin test is whether they have received bacille Calmette-Guérin (BCG) vaccine. This is because BCG vaccination can cause a false positive result on the tuberculin test due to cross-reactivity with the purified protein derivative (PPD) used in the test. Asking about recent hospitalization (A), homelessness (B), or recent travel out of the country (D) would not provide relevant information regarding the interpretation of the positive tuberculin test.

Correct Answer: A

Rationale: The correct answer is A: Quadriceps setting exercises. These exercises help prevent complications by strengthening the quadriceps muscles, which are crucial for knee stability and joint support post-surgery. They also aid in preventing muscle atrophy and promoting blood circulation. Leg lifts with weights (B) may strain the knee joint, leading to complications. Isometric muscle contractions (C) involve static muscle contractions and do not provide the necessary range of motion needed post-knee surgery. Active range-of-motion exercises (D) may be beneficial but should be performed after quadriceps setting exercises to avoid unnecessary strain on the knee joint.

Correct Answer: B

Rationale: The correct answer is B: Providing a source of fast-acting carbohydrate. In a hypoglycemic episode, the priority is to raise the blood sugar quickly to prevent further complications. Fast-acting carbohydrates such as glucose tablets or orange juice can rapidly increase blood sugar levels. Administering insulin (choice A) can further lower blood sugar, checking blood glucose levels (choice C) may delay treatment, and contacting the healthcare provider (choice D) is not necessary in the immediate management of hypoglycemia.

Correct Answer: B

Rationale: The correct answer is B: The diaphragm of the stethoscope. The diaphragm is used to assess heart murmurs as it allows for higher-frequency sounds to be heard more clearly. When assessing heart murmurs, using the diaphragm helps to differentiate between systolic and diastolic murmurs, as well as to identify specific characteristics such as intensity and location. A: The bell of the stethoscope is used for low-frequency sounds and would not be ideal for assessing heart murmurs. C: Palpation with the palm of the hand is used to assess pulses and vibrations, not heart murmurs. D: Asking another nurse to double-check the finding is important for validation but does not directly relate to the technique used to assess a heart murmur.

Correct Answer: A

Rationale: The correct answer is A: Lethargic. Lethargic is defined as a state of drowsiness or diminished alertness where the patient can be easily aroused by simple stimuli like calling their name, but they remain drowsy and may drift back to sleep. This patient's ability to be aroused by verbal stimuli and their drowsiness during conversation fits the description of lethargic. Explanation for other choices: B: Obtunded - Obtunded refers to a more severe level of decreased consciousness where the patient is difficult to fully arouse and may have limited interactions with the nurse. C: Stuporous - Stuporous indicates an even deeper state of unconsciousness where the patient requires significant stimulation to be aroused and has minimal responsiveness. D: Semialert - Semialert would describe a patient who is more responsive than lethargic, showing better awareness of their surroundings and able to maintain a conversation more effectively.