A woman has had her left breast removed for cancer. She also had an axillary node dissection on the left during surgery. How would this affect placement of an intravenous line?

Correct Answer: C

Rationale: Lymph node dissection increases infection risk (lymphedema), so the left arm is avoided.

Correct Answer: D

Rationale: Amiloride is a potassium-sparing diuretic, so it does not cause hypokalemia.

Correct Answer: B

Rationale: Peaked T waves are the earliest ECG change in hyperkalemia.

Correct Answer: D

Rationale: Calcium chloride has more elemental calcium (27%) than calcium gluconate (9%).

Correct Answer: B

Rationale: Correct osmolality formula is 2(Na+) + glucose + urea, not 2(Na+ urea + glucose).