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Low Blood Sugar and Kidney Disease: A Killer

Posted: Wednesday, May 20, 2009

Low blood sugar, or hypoglycemia, poses a serious health threat for patients with chronic kidney disease (CKD), according to a new study. The findings indicate that hypoglycemia may account for some portion of the excess heart-related deaths seen in CKD patients.

Glucose control is the key to preventing end-stage renal disease (ESRD) in CKD patients with diabetes. However, managing diabetes in CKD patients can be complicated, as patients’ reduced kidney function can affect how they react to anti-diabetes medications. Difficulties with managing their diabetes can predispose CKD patients to episodes of hypoglycemia, a condition that can cause severe health complications including dizziness, disorientation, slurred speech, convulsions, and death.

Jeffrey C. Fink, MD (University of Maryland Medical System), Maureen F. Moen (University of Maryland School of Medicine), and their colleagues designed a study to examine the incidence of hypoglycemia among CKD patients and to determine whether the condition might contribute to CKD patients’ deaths. The researchers assessed the incidence of hypoglycemia in CKD patients relative to non-CKD patients, both with and without diabetes, and they examined the association of hypoglycemia with subsequent near term deaths (one day after blood glucose measurement).

Analysis included information from 243,222 individuals cared for at the Veterans Health Administration. The incidence of hypoglycemia was higher in patients with CKD versus without, both among patients with diabetes and among those without. The risk of hypoglycemia was highest in individuals with both CKD and diabetes.

Hypoglycemia increased patients’ risk of dying in the near term. According to the authors, there was a reduced risk of near term death in individuals with CKD relative to those without and this attenuation in the risk of death might relate to an increased quality of care in these patients with CKD relative to diabetic patients without CKD.

Dr. Fink stated that, "The association of hypoglycemia with one-day mortality underscores the significance of this metabolic disturbance in patients with diabetes and chronic kidney disease…. The findings are consistent with others that have shown that putting patients on intensive glucose-lowering medications can lead to an increased incidence of hypoglycemia and does not prolong their survival.”
 

Source: Diabetes In Control: The article, entitled “The Frequency of Hypoglycemia and Its Significance in Chronic Kidney Disease,” appears online at http://cjasn.asnjournals.org/ doi 10.2215/CJN.00800209. Clinical Journal of the American Society Nephrology (CJASN).

 
 
 
 
 
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