This Clinical Practice Guideline document is based upon systematic literature searches last conducted in June 2011, supplemented with additional evidence through November 2012. It is designed to provide information and assist decision making. It is not intended to define a standard of care, and should not be construed as one, nor should it be interpreted as prescribing an exclusive course of management. Variations in practice will inevitably and appropriately occur when clinicians take into account the needs of individual patients, available resources, and limitations unique to an institution or type of practice. Every health-care professional making use of these recommendations is responsible for evaluating the appropriateness of applying them in any particular clinical situation. The recommendations for research contained within this document are general and do not imply a specific protocol. SECTION II: DISCLOSUREKidney Disease: Improving Global Outcomes (KDIGO) makes every effort to avoid any actual or reasonably perceived conflicts of interest that may arise as a result of an outside relationship or a personal, professional, or business interest of a member of the Work Group. All members of the Work Group are required to complete, sign, and submit a disclosure and attestation form showing all such relationships that might be perceived as or are actual conflicts of interest. This document is updated annually and information is adjusted accordingly. All reported information is published in its entirety at the end of this document in the Work Group members' Biographic and Disclosure Information section, and is kept on file at the National Kidney Foundation (NKF), former Managing Agent for KDIGO.http://www.kidney-international.org
Since several studies have suggested that a slight increase in urinary albumin excretion (microalbuminuria) is predictive of nephropathy in patients with diabetes mellitus, we studied the relation of albumin excretion to renal structure in patients with insulin-dependent (Type I) diabetes. Renal biopsy specimens were evaluated with light- and electron-microscopical morphometric techniques in 48 patients who had had diabetes for 5 to 40 years and who excreted less than 200 mg of urinary albumin per 24 hours. Patients in Group I (n = 26) had normal urinary albumin excretion, creatinine clearance, and blood pressure; those in Group II (n = 10) had increased urinary albumin excretion but normal creatinine clearance and blood pressure; those in Group III (n = 12) had increased urinary albumin excretion and hypertension, decreased creatinine clearance, or both. Glomerular structure varied similarly, ranging from normal to abnormal in Groups I and II, but was consistently abnormal in Group III. The thickness of the glomerular basement membrane, the fractional volume of the mesangium, and the mesangial volume per glomerulus in Group III exceeded the corresponding values in the other groups significantly. Thus, microalbuminuria, when present with hypertension, decreased creatinine clearance, or both, indicates established abnormalities of glomerular structure. Normal albumin excretion, or microalbuminuria without these other functional abnormalities, does not accurately predict the severity of the underlying glomerular lesions in patients with Type I diabetes.
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