Correct Answer: B

Rationale: The correct answer is B: Relieves pain by increasing pain threshold. Meperidine and codeine are opioid analgesics that work by binding to opioid receptors in the brain and spinal cord, thus increasing the pain threshold and reducing the perception of pain. This leads to pain relief without necessarily affecting sexual stimulation (choice A), craving for alcohol (choice C), or concentration/alertness (choice D). The primary physiological effect of these drugs is to modulate the perception of pain, making choice B the most appropriate answer in this context.

Correct Answer: A

Rationale: The correct answer is A: Hashimoto's thyroiditis. This autoimmune disorder results in chronic inflammation of the thyroid gland, leading to thyroid nodules and hypothyroidism. The colloid-filled spaces seen in the biopsy are characteristic of Hashimoto's. Choice B: Graves' disease is an autoimmune disorder causing hyperthyroidism, not hypothyroidism. Choice C: Diabetes mellitus is a metabolic disorder unrelated to the thyroid. Choice D: Thyroid nodules is a general term and does not explain the presence of colloid-filled spaces.

Correct Answer: A

Rationale: The correct answer is A: Initiate non-invasive positive pressure ventilation (NIPPV). This intervention is prioritized as it helps improve oxygenation and ventilation in COPD exacerbation without the need for invasive mechanical ventilation, reducing the risk of ventilator-associated complications. NIPPV also decreases the work of breathing and can prevent the need for intubation. Administering bronchodilator medications (B) is important in COPD exacerbation but may not address the immediate need for ventilatory support. Endotracheal intubation (C) should be reserved for cases of respiratory failure not responding to NIPPV. Chest physiotherapy (D) may be beneficial in some cases but is not the first-line intervention for managing acute COPD exacerbation.

Correct Answer: C

Rationale: The correct answer is C: Renal colic due to ureteral calculus. The sudden-onset severe colicky flank pain radiating to the groin along with tenderness over the costovertebral angle and hematuria are classic symptoms of kidney stones (ureteral calculus). The pain results from the obstruction of urine flow by the stone, leading to increased pressure and spasm in the ureter. Acute pyelonephritis (choice A) presents with fever, chills, and systemic symptoms. Renal artery embolism (choice B) typically presents with acute onset severe flank pain but is associated with risk factors like atrial fibrillation. Renal infarction (choice D) presents with sudden-onset severe flank pain but is less likely than ureteral calculus in a patient with a history of nephrolithiasis.

Correct Answer: A

Rationale: The correct answer is A: Bleeding. Chemotherapy can lead to low platelet counts (thrombocytopenia), increasing the risk of bleeding. The priority goal of the nurse is to prevent bleeding by taking precautions such as avoiding invasive procedures, using soft toothbrushes, and monitoring for signs of bleeding. Infection (B) is important but not the priority as bleeding can be life-threatening. Hypotension (C) is not directly related to thrombocytopenia. Diarrhea (D) is a potential side effect of chemotherapy but is not the priority when considering thrombocytopenia.