Final answer:
ACE inhibitors and angiotensin receptor blockers can cause hyperkalemia, leading to potential cardiac complications.
Step-by-step explanation:
ACE inhibitors and angiotensin receptor blockers (ARBs) can cause hyperkalemia, which is an elevated level of potassium in the blood. Hyperkalemia can impair the function of skeletal muscles, the nervous system, and the heart. In the case of the heart, it can lead to an inability to relax after contracting, potentially resulting in a cardiac arrest. These medications are commonly used to treat conditions like high blood pressure and heart failure, so it's important for healthcare providers to monitor potassium levels and make dosage adjustments if necessary.