Diabetes mellitus (DM) is a chronic metabolic disorder characterized by persistent hyperglycaemia arising from abnormalities in insulin secretion, insulin action, or both. Cardiovascular complications constitute some of the most clinically important consequences of diabetes. The cardiovascular spectrum includes coronary artery disease, myocardial infarction, cerebrovascular disease, peripheral arterial disease and heart failure. The source thesis emphasizes that cardiovascular risk in diabetes results from interactions among hyperglycaemia, dyslipidaemia, insulin resistance, oxidative stress, inflammation, endothelial dysfunction and renal impairment.

Chronic hyperglycaemia promotes several mechanisms implicated in vascular injury. Persistent exposure of vascular tissues to elevated glucose concentrations contributes to advanced glycation end-product formation, oxidative stress, endothelial dysfunction and inflammatory activation. HbA1c provides an integrated measure of glycaemic exposure and is therefore useful not only in monitoring diabetes but also in assessing the metabolic burden potentially contributing to vascular complications.

Dyslipidaemia represents another major component of cardiovascular risk among individuals with diabetes. Diabetic dyslipidaemia commonly involves increased triglyceride-rich lipoproteins, reduced HDL-C and qualitative or quantitative abnormalities in LDL particles. Consequently, evaluation based only on total cholesterol may not adequately represent the atherogenic burden.

The source document identifies HbA1c, LDL-C, triglycerides, HDL-C, renal function indices and albuminuria as particularly important conventional biochemical parameters in diabetic cardiovascular disease. It further emphasizes the usefulness of integrated cardiovascular risk assessment rather than dependence on a single biochemical parameter.

Lipid ratios may provide additional information regarding the balance between atherogenic and protective lipoproteins. TC/HDL-C, LDL-C/HDL-C and TG/HDL-C ratios can therefore complement conventional lipid measurements.

The present study was undertaken to compare glycaemic and lipid parameters between diabetic patients with and without cardiovascular complications and to determine whether a distinct metabolic and atherogenic biochemical pattern is associated with cardiovascular disease.

Aim To evaluate glycaemic and lipid parameters associated with cardiovascular complications in patients with diabetes mellitus.

The study was designed as a hospital-based observational, analytical, cross-sectional study. It was conducted in the Department of Biochemistry in collaboration with the participating clinical departments at Amaltas Institute of Medical Sciences. Biochemical investigations were performed in the institutional clinical biochemistry laboratory using standardized procedures and internal quality-control measures. Study Population Adult patients diagnosed with diabetes mellitus and attending the outpatient departments or admitted to the participating inpatient departments constituted the study population. Participants were classified into: Group I: Diabetic patients with documented cardiovascular complications. Group II: Diabetic patients without documented cardiovascular complications. Cardiovascular complications considered in the source protocol included coronary artery disease, acute coronary syndrome, previous myocardial infarction, ischaemic heart disease, heart failure, cerebrovascular disease/ischaemic stroke and peripheral arterial disease. For the illustrative analysis presented in the thesis, 200 diabetic patients were considered, comprising 100 with and 100 without cardiovascular complications. Biochemical Assessment Fasting venous blood samples were collected according to the study protocol. Glycaemic assessment included fasting plasma glucose, postprandial plasma glucose and HbA1c. The lipid profile included total cholesterol, triglycerides, LDL-C and HDL-C. Non-HDL-C and relevant atherogenic ratios were derived from lipid measurements. The following ratios were evaluated: • TC/HDL-C ratio • LDL-C/HDL-C ratio • TG/HDL-C ratio Statistical Analysis Continuous variables were expressed as mean±standard deviation where normally distributed. Between-group comparisons were performed using the independent-samples Student's t-test for normally distributed variables and appropriate non-parametric tests for non-normally distributed variables. Categorical variables were compared using the chi-square or Fisher's exact test where appropriate. A two-sided p-value <0.05 was considered statistically significant.

The source thesis identifies its numerical results as illustrative examples generated for thesis formatting and statistical presentation rather than actual study findings. The following three tables therefore reproduce and reorganize those illustrative data for manuscript development.

Table 1. Comparison of Glycaemic Parameters Between Diabetic Patients With and Without Cardiovascular Complications

FPG and PPG were significantly higher among patients with cardiovascular complications. Mean HbA1c was also 1.3 percentage points higher in the CVD group. These findings demonstrate substantially poorer glycaemic control among patients with cardiovascular complications.

Table 2. Comparison of Lipid Profile Between Diabetic Patients With and Without Cardiovascular Complications

Patients with cardiovascular complications demonstrated significantly higher TC, TG, LDL-C and non-HDL-C concentrations. Conversely, HDL-C was significantly lower, demonstrating a more atherogenic lipid pattern in patients with cardiovascular disease.

Table 3. Comparison of Atherogenic Lipid Ratios

All three lipid ratios were significantly elevated in patients with cardiovascular complications. The findings demonstrate that the relationship between atherogenic and protective lipid fractions was more adverse in the CVD group.

The present illustrative analysis demonstrates a clear difference in glycaemic and lipid profiles between diabetic patients with and without cardiovascular complications. Patients with cardiovascular disease exhibited significantly higher fasting and postprandial glucose concentrations, higher HbA1c, elevated atherogenic lipid fractions and lower HDL-C. One of the most prominent findings was the significantly higher HbA1c among patients with cardiovascular complications. Mean HbA1c was 8.9±1.4% in the CVD group compared with 7.6±1.2% among those without CVD. This pattern is consistent with the thesis framework that prolonged glycaemic exposure contributes to vascular injury and cardiovascular risk. The lipid profile demonstrated an equally important pattern. Total cholesterol was approximately 211 mg/dL among patients with CVD compared with 185 mg/dL among those without CVD. LDL-C was 132.8±35.7 mg/dL compared with 108.4±31.6 mg/dL, while triglycerides were also substantially elevated. In contrast, HDL-C was lower among patients with cardiovascular complications. These abnormalities represent an atherogenic lipid environment. Increased concentrations of LDL-containing and triglyceride-rich lipoproteins contribute to lipid deposition within the arterial wall, while reduced HDL-C may reflect diminished protective lipid transport mechanisms. Atherogenic ratios further strengthened this pattern. TC/HDL-C was 5.7±1.6 versus 4.3±1.2, LDL-C/HDL-C was 3.6±1.2 versus 2.6±0.9, and TG/HDL-C was 5.4±2.5 versus 3.7±1.8. Thus, the CVD group demonstrated abnormalities not merely in individual lipid concentrations but also in the overall balance between atherogenic and potentially protective lipid fractions. The source thesis additionally reports significant correlations between HbA1c and several lipid variables. HbA1c correlated positively with total cholesterol (r=0.31), triglycerides (r=0.36) and LDL-C (r=0.29), while showing a negative relationship with HDL-C (r=-0.27), with all reported p-values <0.001. These observations suggest an interconnected pattern of poor glycaemic control and adverse lipid metabolism. From a clinical perspective, these findings emphasize that cardiovascular risk assessment in diabetes should not depend on glycaemic measures alone. HbA1c provides important information regarding chronic glycaemic exposure, while LDL-C, triglycerides, HDL-C, non-HDL-C and lipid ratios provide complementary information concerning atherogenic risk. This interpretation is also emphasized in the source thesis. The cross-sectional nature of the study nevertheless prevents establishment of temporal or causal relationships. Biochemical measurements can also be affected by statins, glucose-lowering agents, antihypertensive therapy and other medications. The source thesis specifically identifies these issues among its limitations.

Diabetic patients with cardiovascular complications demonstrated significantly poorer glycaemic control and a more atherogenic lipid profile than diabetic patients without cardiovascular complications. FPG, PPG and HbA1c were significantly elevated, while TC, TG, LDL-C and non-HDL-C were higher and HDL-C was lower in patients with CVD. Atherogenic TC/HDL-C, LDL-C/HDL-C and TG/HDL-C ratios were also significantly elevated. These findings support integrated assessment of glycaemic control and lipid abnormalities when evaluating cardiovascular risk among patients with diabetes mellitus.