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Implications of albuminuria on kidney disease progression
1Rush University Hypertension Center, Rush University Medical Center, 1700 West Van Buren Street, Suite 470, Chicago, IL 60612, USA. george_bakris@rush.edu
Abstract:
Albuminuria is recognized in all hypertension guideline statements as a cardiovascular risk factor and indicator of kidney disease. Recent data also demonstrate a strong association between the presence of microalbuminuria and elevations in C-reactive protein. Thus, the increased membrane permeability that generates microalbuminuria may be secondary to an inflammatory process. Progression from microalbuminuria (>30 and < or =300 mg albumin/g creatinine) to macroalbuminuria (>300 mg albumin/g creatinine) indicates a worsening of vascular disease and the presence of kidney disease. Recent outcome trials of kidney disease progression have demonstrated the best results among those with reductions in albuminuria in concert with blood pressure (BP) reduction. Thus, use antihypertensive agents that not only lower BP but also lower or normalize albuminuria levels. All recent guideline statements support the use of agents that block the renin-angiotensin-aldosterone system as part of a regimen to achieve the BP goal. Further lowering of albuminuria may be achieved by adding either a nondihydropyridine calcium antagonist such as verapamil or diltiazem, or aldosterone receptor blockers. Use of an angiotensin receptor blocker added to an angiotensin-converting enzyme inhibitor or vice versa can further lower albuminuria by an additional 30%-40%, which is not true of the additional lowering of BP.
Insights
Albuminuria indicates cardiovascular and kidney disease risk. Reducing albuminuria with specific antihypertensive agents, particularly those blocking the renin-angiotensin-aldosterone system, improves outcomes.
Area of Science:
- Nephrology
- Cardiology
- Internal Medicine
Background:
- Albuminuria is a key indicator of cardiovascular risk and kidney disease.
- Microalbuminuria is linked to inflammation (elevated C-reactive protein), suggesting increased vascular permeability.
- Progression to macroalbuminuria signifies worsening vascular and kidney disease.
Purpose of the Study:
- To emphasize the importance of albuminuria reduction in managing hypertension and kidney disease.
- To guide the selection of antihypertensive agents that effectively lower both blood pressure and albuminuria.
Main Methods:
- Review of hypertension guidelines and recent outcome trials.
- Analysis of the role of inflammation in microalbuminuria development.
- Evaluation of antihypertensive strategies for albuminuria management.
Main Results:
- Albuminuria reduction, alongside blood pressure control, is crucial for favorable outcomes in kidney disease progression.
- Agents blocking the renin-angiotensin-aldosterone system are recommended for BP goals and albuminuria reduction.
- Combination therapy (e.g., ACE inhibitors with ARBs) can significantly further reduce albuminuria.
Conclusions:
- Antihypertensive therapy should prioritize agents that lower both blood pressure and albuminuria.
- Targeting the renin-angiotensin-aldosterone system is a cornerstone of managing albuminuria.
- Additional albuminuria reduction strategies, like dual RAAS blockade or adding specific agents, offer significant benefits beyond BP lowering.
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