Elevations in serum creatinine concentration: concerning or reassuring?

Area of Science:

• Nephrology
• Cardiology
• Pharmacology

Background:

• Angiotensin-converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs) significantly reduce morbidity and mortality in vascular disease.
• Despite proven benefits, the utilization of ACE inhibitors and ARBs remains suboptimal due to concerns about renal function.
• Clinicians often hesitate to prescribe these vital medications owing to potential short-term decreases in glomerular filtration rate (GFR).

Discussion:

• The transient decrease in GFR observed after initiating ACE inhibitors or ARBs is a functional response, not indicative of pathology.
• This physiological change is directly related to the renin-angiotensin system's role in maintaining GFR.
• Misinterpretation of this early GFR change as an adverse effect leads to unnecessary withholding of beneficial therapies.

Key Insights:

• Early elevations in serum creatinine, often accompanying a GFR decrease, are paradoxically associated with improved long-term renal outcomes.
• This finding supports the continued use of ACE inhibitors and ARBs, even when initial renal function changes occur.
• Understanding the physiological basis of these changes is crucial for appropriate clinical management.

Outlook:

• Increased clinician awareness of the expected physiological response to renin-angiotensin system blockade can improve ACE inhibitor and ARB utilization.
• Further education on the renoprotective effects and interpretation of early renal function changes will optimize patient care.
• This understanding can help overcome barriers to prescribing these essential medications, ultimately benefiting patients with vascular disease and renal insufficiency.