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Importance of glycemic control on the course of glomerular filtration rate in type 2 diabetes with hypertension and microalbuminuria under tight blood pressure control.
Nutr Metab Cardiovasc Dis. 2008 Nov; 18(9):632-8.NM

Abstract

BACKGROUND AND AIMS

To evaluate the role of glycemic control on the evolution of glomerular filtration rate (GFR) in type 2 diabetes (T2DM) with mild-moderate hypertension under tight blood pressure control, and to address the current controversy whether diabetic nephropathy worsens, independently of blood pressure, proportionally to HbA1c at any physiological level or only when HbA1c is above a 7.5-8% threshold.

METHODS AND RESULTS

T2DM (N=127) during early stage diabetic nephropathy characterized by microalbuminuria were followed during a 2 year multicenter study. Individual GFR profiles were accurately obtained by (51)Cr - EDTA bolus injections and analyzed with linear statistical mixed-effects models. GFR at baseline was significantly negatively correlated with age and plasma creatinine concentration (P<or=0.0001), and GFR declined, on average, by 4.0 ml/min 1.73 m(2)/year (P=0.001). A significant correlation was found between individual GFR decline rate and average systolic (SBP) and diastolic (DBP) blood pressures (-0.254 (0.736) ml/min 1.73 m(2)/year per mmHg increase in SBP (DBP), P=0.041 (0.014)) and % of glycated hemoglobin (HbA1c) (-1.78 ml/min 1.73 m(2)/year per % increase in HbA1c, P=0.048). This implies a 44% increase/reduction in GFR decline rate for 1% HbA1c increase/reduction around 7.0% (i.e. 5.79 and 2.24 ml/min 1.73 m(2)/year at 8% and 6% HbA1c, respectively).

CONCLUSIONS

This study demonstrates that, despite tight blood pressure control, an accurate glycemic control till very low patterns of HbA1c (from 10-11% to 5-6%) is needed to delay the progression of GFR decay in Mediterranean T2DM in south Europe with microalbuminuria.

Authors+Show Affiliations

National Research Council, Institute of Biomedical Engineering, CNR, Corso Stati Uniti 4, 35127 Padova, Italy. karl.thomaseth@isib.cnr.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18060749

Citation

Thomaseth, Karl, et al. "Importance of Glycemic Control On the Course of Glomerular Filtration Rate in Type 2 Diabetes With Hypertension and Microalbuminuria Under Tight Blood Pressure Control." Nutrition, Metabolism, and Cardiovascular Diseases : NMCD, vol. 18, no. 9, 2008, pp. 632-8.
Thomaseth K, Pacini G, Morelli P, et al. Importance of glycemic control on the course of glomerular filtration rate in type 2 diabetes with hypertension and microalbuminuria under tight blood pressure control. Nutr Metab Cardiovasc Dis. 2008;18(9):632-8.
Thomaseth, K., Pacini, G., Morelli, P., Tonolo, G., & Nosadini, R. (2008). Importance of glycemic control on the course of glomerular filtration rate in type 2 diabetes with hypertension and microalbuminuria under tight blood pressure control. Nutrition, Metabolism, and Cardiovascular Diseases : NMCD, 18(9), 632-8.
Thomaseth K, et al. Importance of Glycemic Control On the Course of Glomerular Filtration Rate in Type 2 Diabetes With Hypertension and Microalbuminuria Under Tight Blood Pressure Control. Nutr Metab Cardiovasc Dis. 2008;18(9):632-8. PubMed PMID: 18060749.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Importance of glycemic control on the course of glomerular filtration rate in type 2 diabetes with hypertension and microalbuminuria under tight blood pressure control. AU - Thomaseth,Karl, AU - Pacini,Giovanni, AU - Morelli,Patrizia, AU - Tonolo,Giancarlo, AU - Nosadini,Romano, Y1 - 2007/12/03/ PY - 2006/06/23/received PY - 2007/02/06/revised PY - 2007/05/04/accepted PY - 2007/12/7/pubmed PY - 2009/1/28/medline PY - 2007/12/7/entrez SP - 632 EP - 8 JF - Nutrition, metabolism, and cardiovascular diseases : NMCD JO - Nutr Metab Cardiovasc Dis VL - 18 IS - 9 N2 - BACKGROUND AND AIMS: To evaluate the role of glycemic control on the evolution of glomerular filtration rate (GFR) in type 2 diabetes (T2DM) with mild-moderate hypertension under tight blood pressure control, and to address the current controversy whether diabetic nephropathy worsens, independently of blood pressure, proportionally to HbA1c at any physiological level or only when HbA1c is above a 7.5-8% threshold. METHODS AND RESULTS: T2DM (N=127) during early stage diabetic nephropathy characterized by microalbuminuria were followed during a 2 year multicenter study. Individual GFR profiles were accurately obtained by (51)Cr - EDTA bolus injections and analyzed with linear statistical mixed-effects models. GFR at baseline was significantly negatively correlated with age and plasma creatinine concentration (P<or=0.0001), and GFR declined, on average, by 4.0 ml/min 1.73 m(2)/year (P=0.001). A significant correlation was found between individual GFR decline rate and average systolic (SBP) and diastolic (DBP) blood pressures (-0.254 (0.736) ml/min 1.73 m(2)/year per mmHg increase in SBP (DBP), P=0.041 (0.014)) and % of glycated hemoglobin (HbA1c) (-1.78 ml/min 1.73 m(2)/year per % increase in HbA1c, P=0.048). This implies a 44% increase/reduction in GFR decline rate for 1% HbA1c increase/reduction around 7.0% (i.e. 5.79 and 2.24 ml/min 1.73 m(2)/year at 8% and 6% HbA1c, respectively). CONCLUSIONS: This study demonstrates that, despite tight blood pressure control, an accurate glycemic control till very low patterns of HbA1c (from 10-11% to 5-6%) is needed to delay the progression of GFR decay in Mediterranean T2DM in south Europe with microalbuminuria. SN - 1590-3729 UR - https://www.unboundmedicine.com/medline/citation/18060749/Importance_of_glycemic_control_on_the_course_of_glomerular_filtration_rate_in_type_2_diabetes_with_hypertension_and_microalbuminuria_under_tight_blood_pressure_control_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0939-4753(07)00109-3 DB - PRIME DP - Unbound Medicine ER -