Diabetic retinopathy is associated with insulin resistance and cardiovascular autonomic dysfunction in type 2 diabetic patients.
Diabetic retinopathy (DR) and cardiovascular autonomic dysfunction are associated with high mortality in type 2 diabetic patients. This preliminary study was therefore designed to test the hypothesis that DR is associated with insulin resistance and cardiovascular autonomic dysfunction in type 2 diabetic patients without insulin treatment. Seventy persons were diagnosed to have type 2 diabetes in the examination from June 2004 to May 2006. The study group consisted of 29 type 2 diabetic patients with DR (age: 58+/-6 years, mean+/-s.d.) and 41 type 2 diabetic patients with no DR (NDR) (n=41, 58+/-5 years). Cardiovascular autonomic function was assessed by baroreflex sensitivity (BRS), heart rate variability, plasma norepinephrine concentration and cardiac (123)I-metaiodobenzylguanidine (MIBG) scintigraphic findings. DR patients had lower BRS, early and delayed (123)I-MIBG myocardial uptake values and higher percent washout rate (WR) of (123)I-MIBG than the NDR patients. With respect to metabolic findings, DR patients had higher fasting plasma insulin concentration (P<0.0001) and higher homeostasis model assessment (HOMA) index (P<0.00001) than the NDR patients. Multiple logistic regression analysis revealed that the presence of DR was independently predicted by HOMA index and the percent WR of (123)I-MIBG (P<0.01 and P<0.05, respectively). Our results suggest that DR is associated with depressed cardiovascular autonomic function and insulin resistance and that HOMA index and the percent WR of (123)I-MIBG are independently associated with DR in Japanese patients with type 2 diabetes mellitus.
Anan
Futoshi
F
Department of Cardiology, Oita Red Cross Hospital, Oita, Japan. anan-f@med.oita-u.ac.jp
Takayuki
Masaki
M
Takahashi
Naohiko
N
Nakagawa
Mikiko
M
Eshima
Nobuoki
N
Saikawa
Tetsunori
T
Yoshimatsu
Hironobu
H
D019797:3-Iodobenzylguanidine; D000886:Anthropometry; D001342:Autonomic Nervous System Diseases / Q000150:complications / Q000503:physiopathology*; D017704:Baroreflex / Q000502:physiology; D001823:Body Composition / Q000502:physiology; D002318:Cardiovascular Diseases / Q000150:complications / Q000503:physiopathology*; D003924:Diabetes Mellitus, Type 2 / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology*; D003930:Diabetic Retinopathy / Q000150:complications / Q000503:physiopathology*; D004452:Echocardiography; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000503:physiopathology; D007333:Insulin Resistance / Q000502:physiology*; D007564:Japan; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009638:Norepinephrine / Q000097:blood; D011877:Radionuclide Imaging
D019797:3-Iodobenzylguanidine; D009638:Norepinephrine