Final answer:
The finding that requires immediate nursing action for a patient on an ACE Inhibitor is increased serum potassium levels.
Step-by-step explanation:
The finding that requires immediate nursing action for a patient taking an ACE Inhibitor to manage blood pressure is increased serum potassium levels.
ACE inhibitors can cause an increase in serum potassium levels, known as hyperkalemia, as they inhibit the enzyme responsible for the breakdown of angiotensin II. Hyperkalemia can be life-threatening and may lead to cardiac arrhythmias and other complications. Therefore, it is important to monitor potassium levels closely and take immediate action if they become elevated.