Final answer:
Patients with hypertension who also suffer from congestive heart failure or renal failure are best treated with ACE inhibitors. These drugs lower blood pressure and reduce the heart's workload, and they help protect kidney function.
Step-by-step explanation:
The class of drugs important to use in patients with hypertension who also have congestive heart failure or renal failure is ACE inhibitors. ACE inhibitors are particularly effective in these conditions because they block the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor, which leads to decreased blood pressure levels.
This mechanism is beneficial not only for managing hypertension but also for reducing the workload on the heart, which is critically important in congestive heart failure.
Additionally, ACE inhibitors can help protect kidney function in patients with renal failure.