Free UWorld Customization Features Questions and Answers — Questions and Answers
Question 1: Which of the following arteries is most likely injured in a midshaft humerus fracture?
- Axillary artery
- Brachial artery
- Radial artery (Correct answer)
- Subclavian artery
Correct answer: Radial artery
A midshaft humerus fracture is notoriously associated with injury to the radial nerve, which courses in the radial groove of the humerus. While the deep brachial artery (profunda brachii) runs alongside the radial nerve, severe trauma to the humerus shaft can also compromise the main brachial artery, which is the primary blood supply to the forearm. Although the radial artery is located distally in the forearm, its perfusion can be critically affected by a more proximal brachial artery injury, or in complex fractures, direct trauma could extend to affect its integrity.
Question 2: A 65-year-old patient with hypertension is started on a medication that inhibits angiotensin-converting enzyme (ACE). Which adverse effect is most commonly associated with this drug?
- Hyperkalemia (Correct answer)
- Hypokalemia
- Bradycardia
- Hypocalcemia
Correct answer: Hyperkalemia
ACE inhibitors block the conversion of angiotensin I to angiotensin II, which leads to reduced aldosterone secretion. Aldosterone normally promotes sodium reabsorption and potassium excretion in the kidneys. By inhibiting aldosterone, ACE inhibitors can cause decreased potassium excretion, thereby increasing the risk of hyperkalemia (elevated potassium levels) as a common adverse effect.
Question 3: A nurse is caring for a patient with a nasogastric tube who is at risk for aspiration pneumonia. Which intervention is most appropriate to minimize the risk?
- Keeping the patient in a supine position
- Flushing the NG tube every 2 hours
- Elevating the head of the bed to at least 30 degrees (Correct answer)
- Administering thickened liquids through the NG tube
Correct answer: Elevating the head of the bed to at least 30 degrees
Elevating the head of the bed to at least 30 degrees, and ideally 30-45 degrees, is a crucial intervention to minimize the risk of aspiration pneumonia in patients with a nasogastric tube. This position utilizes gravity to help keep gastric contents in the stomach, significantly reducing the likelihood of reflux and subsequent aspiration into the lungs. It is a standard and highly effective nursing practice for aspiration prevention.
Question 4: If 𝑥²−4𝑥+3=0, what are the solutions for 𝑥?
- 𝑥=1 or 𝑥=3 (Correct answer)
- 𝑥=−1 or 𝑥=−3
- 𝑥=2 or 𝑥=3
- 𝑥=−2 or 𝑥=−3
Correct answer: 𝑥=1 or 𝑥=3
To solve the quadratic equation 𝑥²−4𝑥+3=0, we can factor it. We need two numbers that multiply to +3 and add to -4, which are -1 and -3. Therefore, the equation factors into (𝑥−1)(𝑥−3)=0. Setting each factor to zero gives the solutions: 𝑥−1=0 implies 𝑥=1, and 𝑥−3=0 implies 𝑥=3.
Question 5: Which of the following is the largest planet in our solar system?
- Earth
- Jupiter (Correct answer)
- Saturn
- Neptune
Correct answer: Jupiter
Jupiter is the largest planet in our solar system by a significant margin. It boasts a diameter of approximately 140,000 kilometers, which is more than 11 times the diameter of Earth. Its immense size and mass make it the dominant gravitational force among the planets, distinguishing it from all other celestial bodies in our solar system.
Free UWorld Customization Features Questions and Answers
Which of the following arteries is most likely injured in a midshaft humerus fracture?