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The importance of microalbuminuria as a cardiovascular risk indicator: A review
G F H Diercks1, A J van Boven, J L Hillege
1Department of Clinical Pharmacology, University of Groningen, A Deusinglaan, 19713 AV Groningen, The Netherlands. g.f.h.diercks@med.rug.nl
Abstract:
The present review describes the knowledge of microalbuminuria as a cardiovascular risk indicator. Microalbuminuria is usually defined as a urinary albumin excretion rate of 30 to 300 mg in a 24 h urine collection, or as a urinary albumin excretion rate of 20 to 200 mg/min in a timed overnight urine collection, although microalbuminuria was demonstrated to be a predictor for cardiovascular events at levels below these conventional cut-off values. More than one consecutive urine collection is preferred given the high day to day variability of urinary albumin excretion. Microalbuminuria is frequently present and a known cardiovascular risk indicator in diabetic populations. Also, in hypertensive and general populations, microalbuminuria is common and has been associated with an adverse atherogenic risk profile and a higher prevalence of cardiovascular disease. Moreover, evidence strongly suggests that microalbuminuria is also an independent predictor of cardiovascular disease in these populations. However, more prospective studies are needed to elucidate fully the value of microalbuminuria as a cardiovascular risk indicator in hypertensive and general populations. Generalized endothelial dysfunction has been hypothesized to be the underlying factor for microalbuminuria on one hand and the underlying factor for increased cardiovascular risk on the other. In this respect, the loss of the glycosaminoglycan heparin sulphate might be an important pathophysiological mechanism. This hypothesis needs further clarification, especially in nondiabetic populations.
Insights
Microalbuminuria, a marker of kidney damage, indicates increased cardiovascular risk, even below standard detection levels. This finding is crucial for identifying individuals at higher risk of heart disease.
Area of Science:
- Nephrology
- Cardiology
- Biomarkers
Background:
- Microalbuminuria is defined by specific urinary albumin excretion rates.
- It is a known cardiovascular risk indicator, particularly in diabetic populations.
- Its presence in hypertensive and general populations is associated with adverse cardiovascular outcomes.
Purpose of the Study:
- To review the role of microalbuminuria as a cardiovascular risk indicator.
- To explore its predictive value in various populations, including non-diabetic individuals.
- To discuss potential underlying pathophysiological mechanisms.
Main Methods:
- Review of existing literature on microalbuminuria and cardiovascular risk.
- Analysis of diagnostic criteria and predictive values.
- Examination of proposed pathophysiological links, such as endothelial dysfunction.
Main Results:
- Microalbuminuria predicts cardiovascular events even below conventional cut-off values.
- It is a common finding and independent predictor of cardiovascular disease in diabetic, hypertensive, and general populations.
- Day-to-day variability necessitates multiple urine collections for accurate assessment.
Conclusions:
- Microalbuminuria is a significant cardiovascular risk indicator across diverse populations.
- Further prospective studies are needed to confirm its value in hypertensive and general populations.
- Endothelial dysfunction and loss of heparin sulfate may be key pathophysiological mechanisms requiring further investigation, especially in non-diabetic individuals.