Objectives: To estimate the
oxidant/antioxidant status in type 2 diabetic patients with retinopathy and to
compare the development of retinopathy with a number of independent variables
(age, gender, education, body mass index, diabetes length, glycosylated
haemoglobin, hypertension). Design of Analysis: Case-control study. Location
and length of the study: Research laboratories, Department of Medical
Laboratories, Qassim University College of Applied Medical Sciences, April
2010-April 2011. Methodology: One hundred diabetic patients with retinopathy
were included in the study, recruited from King Fahad Specialist Hospital-
Buraidah. The control groups were: control group 1 consisted of sixty
non-retinopathic type 2 diabetic patients recruited from the Diabetes and
Endocrinology Center, KFSH, Buraidah, KSA; and control group 2 consisted of
sixty publicly recruited stable 'non-diabetic subjects,' i.e. Estarahes,
Estarahes (party lounges). Every subject's blood was used to prepare plasma,
serum, and erythrocyte lysate. Using commercial kits supplied by Northwest,
U.S.A., human serum 8-OHdG, plasma MDA, and erythrocyte lysate Cu-Zn SOD were
estimated. Data was analysed using SPSS software and Win Episcope software.
P-values <0.05 were considered to be important. Results: The development of
retinopathy was consistently correlated with age, education, period of
diabetes, impaired glycaemic control and hypertension (OR 5.891, 4.44, 10.420,
1.699, 1.820 respectively). In addition, increased plasma MDA, elevated serum 8-OHdG
levels, and decreased activity of Cu-Zn SOD were observed in diabetic patients
with retinopathy relative to control group subjects. Furthermore, in all
subjects, negative associations between plasma MDA and Cu-Zn SOD activity,
HbA1c & Cu-Zn SOD activity were identified. Conclusion: This research
highlights the important role of oxidative stress in the development of
retinopathy in type 2 diabetes, indicating that the blocking of oxidative
stress is a key step in slowing the progression of diabetic retinopathy, and
hence the need to delay the severity of diabetic retinopathy with antioxidant
supplements.
Author(s) Details
Abdelmarouf Hassan Mohieldein
Department of Medical
Laboratories, College of Applied Medical Sciences, Qassim University, Saudi Arabia.
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