Prevalence of dyslipidemia in patients with type-2 diabetes mellitus

ABSTRACT

The dyslipidaemia associated with type-2 diabetes is associated with raised plasma triglycerides, low high-density lipoprotein cholesterol, high low-density lipoprotein cholesterol and very low-density lipoprotein cholesterol levels and is a risk factor of cardiovascular disease. To assess the lipid abnormalities in patients with type-2 diabetes. A cohort study carried out at Diabetic Clinic of PMRC Research Centre, FJMC, Lahore, Pakistan. Eight years case records of type-2 diabetic patients seen at the research centre from 1999-2006 were reviewed. The research centre is a specialized centre for diagnosing and treating diabetes mellitus. All the patients were recruited for their follow up check up and laboratory investigations for dislipidemia. Adult treatment panel III guidelines for dyslipidaemia were followed. A 12 hours fasting blood sample was collected from each patient for serum total cholesterol, triglycerides, low-density lipoprotein cholesterol [LDL-C], high-density lipoprotein cholesterol [HDL-C], and glucose as well as glycosylated hemoglobin [HbA1c] by using standard methods at Biochemistry laboratory of the research centre. LDL-C/ HDL-C ratios, Very low-density lipoprotein cholesterol [VLDL-C] and body mass index was calculated after anthropometery body mass index [BMI] >/= 25 was considered as overweight while >/= 30 obese. HbA1c<6.1 was considered as poor glycemic control. Data was analyzed by using statistical software SPSS-15. a total of 1200 type-2 diabetes were seen in 8 years. There was poor glycemic control, in 87.5% subjects judged on blood HbA1c levels. These patients had higher total cholesterol, LDL-C and low HDL-C levels in blood. The percentage of patients with high, borderline and near optimal risk LDL-C was 62.7, 26.9 and 10.4% respectively, while HDL-C >40mg/dl were seen in 67%. Raised VLDL-C [above 40 mg/dl] was seen in 32.9% cases. The group with high LDL and VLDL is at risk of developing cardiovascular disease. Hypertriglyceridaemia was found in 55% and hypercholesterolaemia in 45.4% cases. Obesity as indicated by body mass index was found in 53.7% patients. Statistically significant association of hypercholesterolemia, hypertriglyceridemia, hypo HDL cholesterolemia and VLDL-C was found with advancing age while only hypertriglyceridemia and VLDL-C showed a positive association with duration of diabetes. A significant association of hyperglycemia [raised HbA1c] was seen with hypertriglyceridemia and high LDL-C along with high body mass index i.e. obesity. Hypertriglyceridemia, high LDL-C and VLDL-C, low HDL-C levels and obesity were the pattern of dyslipidemia found in our diabetic population