What type of imaging test uses X-rays to visualize the blood vessels after injecting them with a contrast dye?

Correct Answer: A

Rationale: The correct answer is A: Angiography. Angiography is the imaging test that uses X-rays to visualize blood vessels by injecting contrast dye. This dye highlights the blood vessels, allowing for clear visualization on X-ray images. Angiography is specifically designed to provide detailed images of the blood vessels and identify any blockages or abnormalities. B: CT scan uses X-rays but does not involve injecting contrast dye into blood vessels. C: MRI uses magnetic fields and radio waves, not X-rays. D: Ultrasound uses sound waves, not X-rays or contrast dye to visualize blood vessels.

Correct Answer: A

Rationale: The correct answer is A: Coronary artery bypass graft (CABG). This surgical procedure involves grafting a blood vessel to bypass a blocked coronary artery, improving blood flow to the heart muscle. It is used to treat severe coronary artery disease. Valve replacement (B) is a surgery to replace heart valves, not to bypass blocked arteries. Angioplasty (C) involves inserting a balloon to widen a narrowed artery, not bypassing it. Endarterectomy (D) is a procedure to remove plaque from an artery, not bypassing a blocked coronary artery.

Correct Answer: A

Rationale: The correct answer is A: Anorexia can be a side effect of digoxin. Digoxin is known to cause anorexia due to its impact on the gastrointestinal system. It can lead to nausea, vomiting, and loss of appetite, resulting in anorexia. Tachycardia (choice B) is not a common side effect of digoxin, as it is actually used to treat certain types of arrhythmias. Constipation (choice C) and urinary retention (choice D) are also not typically associated with digoxin use. In summary, anorexia is a known side effect of digoxin, while tachycardia, constipation, and urinary retention are not commonly linked to this medication.

Correct Answer: C

Rationale: Step-by-step rationale: 1. Dobutamine is a beta-1 adrenergic agonist, which increases heart rate. 2. Tachycardia is a common adverse effect due to increased heart rate. 3. Bradycardia is the opposite effect and not expected with dobutamine. 4. Heart failure is a condition that dobutamine is used to treat, not cause. 5. Respiratory distress is not a typical adverse effect of dobutamine. Summary: Choice C (Tachycardia) is correct because dobutamine increases heart rate. Choices A, B, and D are incorrect because dobutamine does not cause heart failure, bradycardia, or respiratory distress.

Correct Answer: C

Rationale: The correct answer is C: Seizures. Lidocaine is a local anesthetic that can cause central nervous system toxicity, leading to seizures. This is the most concerning side effect because it can be life-threatening. Severe headache (A) is not typically associated with lidocaine toxicity. Nausea and vomiting (B) are common side effects but not the most concerning. Tremors (D) can occur but are not as serious as seizures in this context.