Associations of Electrocardiographic Abnormalities in Stable Type 2 Diabetes Subjects: Experience from a Tertiary Health Facility in South Eastern Nigeria

Abstract

Introduction: Cardiovascular abnormalities are prevalent in the setting of diabetes mellitus, even among stable subjects, necessitating the need for a regular cardiovascular disease screening for this group of patients. Electrocardiogram is a simple and reliable screening test for cardiovascular abnormalities that could be easily accessible even in resource poor and rural settings. This study was carried out to determine the association between cardiovascular risk factors and electrocardiographic abnormalities in stable type 2 diabetes subjects in South Eastern Nigeria.
 Materials and Methods: One hundred and thirty-six stable adults with type 2 diabetes mellitus were recruited consecutively from the out-patient diabetes clinic of Nnamdi Azikiwe University Teaching Hospital in South Eastern Nigeria. They were assessed for the risk factors for cardiovascular diseases that included smoking, obesity, dyslipidaemia, poor glycaemic control, hypertension, lack of exercise, presence of chronic kidney disease and metabolic syndrome. They also had a 12 lead electrocardiogram done. Results were analyzed using SPSS version 25. P value of ˂ 0.05 was considered significant.
 Result: A total of 128 subjects had complete results and were analyzed. There were 63 males and 65 females with a mean age of 58.43 ± 12.85 years and mean diabetes duration of 9.03 ± 7.36 years. A total of 45.3% of the subjects had electrocardiographic abnormalities. Hypertension was present in 54.9%, dyslipidaemia in 91.4%, central obesity in 74.3%, metabolic syndrome in 76.6% and chronic kidney disease in 57.9% of the subjects. Significant association was found between smoking and occurrence of AV block (p = 0.008), central obesity and QRS axis abnormality (p = 0.002), dyslipidaemia and ST segment abnormality (p = 0.001) and lack of exercise and ST segment abnormality (p = 0.000). No significant association was found between age, sex of the subjects, duration of DM, treatment modality for DM, level of glycaemic control, hypertension, presence of CKD and metabolic syndrome and any of the electrocardiographic abnormalities.
 Conclusion: Electrocardiographic abnormalities are common in stable type 2 diabetic subjects. There was significant association between smoking habit, central obesity, dyslipidaemia, lack of exercise and ECG abnormalities that included AV block, QRS axis and ST segment abnormalities.