A 61-year-old man comes to the clinic for a 2-week follow-up visit after being diagnosed with essential hypertension and type 2 diabetes mellitus with microalbuminuria. At his last visit, he was started on ramipril. The patient reports feeling well and has no dizziness, fatigue, or peripheral edema. His blood pressure today is 132/82 mm Hg, a significant improvement from 158/94 mm Hg at his previous visit. His pulse is 72/min. Physical examination is unremarkable.
The patient's laboratory results are as follows:
| Test | Two Weeks Ago | Today |
|---|---|---|
| Serum creatinine | mg/dL | mg/dL |
| Serum potassium | mEq/L | mEq/L |
Which of the following is the most appropriate next step in the management of this patient?
- Continue ramipril at the current dosageAnswer
- BDecrease the dose of ramipril by half
- CDiscontinue ramipril and initiate amlodipine
- DDiscontinue ramipril and initiate losartan
- EOrder a bilateral renal artery duplex ultrasound
Answer
Continue ramipril at the current dosage
The patient is experiencing a normal, expected physiologic response to the initiation of an angiotensin-converting enzyme (ACE) inhibitor. ACE inhibitors (like ramipril) preferentially dilate the efferent arteriole of the glomerulus, which decreases intraglomerular pressure. While this provides long-term renoprotection and reduces proteinuria in diabetic nephropathy, it causes a transient decline in the glomerular filtration rate (GFR) and a subsequent rise in serum creatinine. An increase in serum creatinine of up to from baseline is considered acceptable and does not warrant medication adjustment. In this patient, the creatinine increased from mg/dL to mg/dL, which is exactly a increase. Because he is asymptomatic, his blood pressure is well-controlled, and his potassium is within the normal range, the most appropriate next step is to continue the medication at its current dose.
Step-by-Step Solution
Key Concept
An increase in serum creatinine of up to from baseline is an expected physiologic response following the initiation of an ACE inhibitor or ARB. The medication should be continued at the current dose unless the increase exceeds this threshold or significant hyperkalemia develops.