Correct Answer: A

Rationale: The correct answer is nitrous oxide. Nitrous oxide is commonly known as laughing gas and is used as an anesthetic gas for procedures like dental extractions. It produces analgesia and mild euphoria without loss of consciousness. Nitrogen is a nonmetallic element found in air, while nitric oxide is a vasodilator produced from L-arginine. Nitrogen dioxide is a poisonous gas found in smog and exhaust fumes and is not used for anesthesia.

Correct Answer: A

Rationale: The correct answer is 'Hypotension and Angina.' Norvasc is a medication known to cause hypotension (low blood pressure) and angina (chest pain) as side effects. These side effects are important for the patient to watch out for as they can indicate potential issues related to the medication. Choice B ('Hypertension') is incorrect as Norvasc is actually used to treat hypertension, not cause it. Choice C ('Lower extremity edema') is not a common side effect of Norvasc. Choice D ('Peripheral sensory loss and SOB') is not typically associated with Norvasc's side effects.

Correct Answer: A

Rationale: The correct answer is to contact the patient's physician immediately. The patient's symptoms of upset stomach, nausea, and discomfort could indicate theophylline toxicity, a potentially serious condition. It is crucial to consult the physician promptly to address this issue. Option B, recommending the patient lie on his right side, is incorrect as it does not address the potential theophylline toxicity and is not a priority. Option C, advising the patient to schedule a doctor's visit the next day, is inappropriate as the symptoms may indicate an urgent concern. Option D, suggesting holding the drug Azmacort, is incorrect as it does not address the potential theophylline toxicity and should not be done without consulting the physician first.

Correct Answer: A

Rationale: The correct answer is peroneal nerve injury. The head of the proximal fibula is in close proximity to the peroneal nerve, making it susceptible to injury when there is a fracture. The peroneal nerve runs along the fibula and can be affected by trauma to this area. Choice B, tibial nerve injury, is incorrect as the fracture site is closer to the peroneal nerve, not the tibial nerve. Choice C, sciatic nerve injury, is incorrect as the injury is more localized to the fibular head area where the peroneal nerve is affected. Choice D, femoral nerve injury, is incorrect as the femoral nerve is not immediately adjacent to the proximal fibula and is not typically affected by this type of injury.

Correct Answer: D

Rationale: The correct test to differentiate between sickle cell trait and sickle cell disease is hemoglobin electrophoresis. This test separates different types of hemoglobin based on their electrical charge, allowing for the identification of specific hemoglobin variants like HbS in sickle cell disease. Sickle cell preparation and Sickledex are not specific tests for this differentiation. While a peripheral smear can show sickle cells, it does not provide a definitive differentiation between the trait and the disease as it doesn't identify the specific hemoglobin variant present.