Blood pressure and cardiac autonomic nervous system in obese type 2 diabetic patients: effect of metformin administration

Hyperinsulinemia/insulin resistance and elevated plasma free fatty acids (FFA) levels are involved in the hypertension and cardiac sympathetic overactivity. Metformin improves insulin action and lower plasma FFA concentrations. We investigate the possible effect of metformin on arterial blood pressu...

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Veröffentlicht in:American journal of hypertension 2004-03, Vol.17 (3), p.223-227
Hauptverfasser: Manzella, Daniela, Grella, Rodolfo, Esposito, Katherine, Giugliano, Dario, Barbagallo, Mario, Paolisso, Giuseppe
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container_start_page 223
container_title American journal of hypertension
container_volume 17
creator Manzella, Daniela
Grella, Rodolfo
Esposito, Katherine
Giugliano, Dario
Barbagallo, Mario
Paolisso, Giuseppe
description Hyperinsulinemia/insulin resistance and elevated plasma free fatty acids (FFA) levels are involved in the hypertension and cardiac sympathetic overactivity. Metformin improves insulin action and lower plasma FFA concentrations. We investigate the possible effect of metformin on arterial blood pressure (BP) and cardiac sympathetic nervous system. One hundred twenty overweight type 2 diabetic patients were treated by placebo ( n = 60) + diet or metformin (850 mg twice daily) ( n = 60) + diet for 4 months, to evaluate the effect of metformin treatment on the cardiac autonomic nervous system. Insulin resistance was measured by the Homeostasis Model Assessment (HOMA) index. Heart rate variability (HRV) assessed cardiac sympathovagal balance. Metformin treatment, but not placebo treatment, was associated with a decrease in fasting plasma glucose ( P < .05), insulin ( P < .05), triglyceride ( P < .05), and FFA ( P < .03) concentrations and HOMA index ( P < .03). Metformin treatment was also associated with a significant improvement in cardiac sympathovagal balance but not in mean arterial BP. Furthermore, in a multivariate analysis, delta change in sympathovagal balance index (LF/HF ratio) were associated with delta change in plasma FFA concentrations and HOMA index independently of gender and delta change in plasma triglyceride and HbA1c concentrations. Our study demonstrated that metformin treatment might be useful for improving cardiac sympathovagal balance in obese type 2 diabetic patients.
doi_str_mv 10.1016/j.amjhyper.2003.11.006
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subjects Aged
Anthropometry
Arterial hypertension. Arterial hypotension
Autonomic Nervous System - drug effects
Autonomic Nervous System - physiology
Biological and medical sciences
Biomarkers - blood
Blood and lymphatic vessels
Blood Glucose - drug effects
Blood Glucose - metabolism
blood pressure
Blood Pressure - drug effects
Blood Pressure - physiology
Cardiology. Vascular system
Diabetes Mellitus - drug therapy
Diabetes Mellitus - physiopathology
Diabetes Mellitus, Type 2 - drug therapy
Diabetes Mellitus, Type 2 - physiopathology
Fatty Acids, Nonesterified - blood
Female
free fatty acids
Glycated Hemoglobin A - drug effects
Glycated Hemoglobin A - metabolism
Heart Rate - drug effects
Heart Rate - physiology
heart rate variability
Humans
Hypoglycemic Agents - therapeutic use
insulin resistance
Male
Medical sciences
Metformin
Metformin - therapeutic use
Middle Aged
Multivariate Analysis
Obesity
Treatment Outcome
Triglycerides - blood
title Blood pressure and cardiac autonomic nervous system in obese type 2 diabetic patients: effect of metformin administration
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