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Background: Cardiovascular disease is the leading cause of death in both men and women in the United States, and is a major cause of death throughout the world. According to the Canters for Disease Control and Prevention (CDC), approximately 61 million people in the United States have heart disease, and according to the World Health Organization (WHO), 29 percent of all deaths worldwide are related to the condition.4 With over 3 million deaths owing to cardiovascular diseases every year, India is set to be the 'heart disease capital of the world' in few years, said doctors on the eve of World Heart Day. It is estimated that by 2020 cardiovascular disease will be the cause of over 40 per cent deaths in India as compared to 24 per cent in 1990. Globally, it causes 17.3 million deaths annually.5 The detection rate of cardiovascular diseases has also increased in the country with more diagnostic labs coming up in the rural areas. The prevalence of coronary artery disease in rural India is estimated to be up to 7 per cent as compared to the urban areas where the incidence is up to 12 per cent. The main reasons for this epidemic are lifestyle changes such as sedentary jobs, improvement in socioeconomic status leading to unhealthy diets rich in fats, high stress jobs and the addictions like smoking and tobacco chewing. Need of the study: In the Global Burden Disease Study, reported that a total of 9.4 million deaths in India in 1990, cardiovascular diseases caused 2.3 million deaths (25%), 1.2 million deaths were due to coronary heart disease and 0.5 million dues to stroke. Developing countries contributed 3.5 million of the 6.2 million global deaths from coronary heart disease in 1990. The projections estimate that these countries will account for 7.8 million of the 11.1 million deaths due to coronary heart disease by 2020. The aging population has raised concerns about the social and economic resources that may be necessary to manage the growing number of elderly persons with Cardio Vascular Disease. Coronary Artery Disease is the major cause of death both elderly men and women. 12 Poor diet and physical activity are the most common risk factors for heart disease. The role of diet and nutrition is influenced by a range of social, cultural, economic and physiological factors. Overweight and obesity are established risk factors for heart disease, 13 According to Bangalore statistics total of nearly 25.7% of coronary artery disease are identified in the year 2011. The factors they consider are due to rapid urbanization and south Indian diet, that is predominantly rice and carbohydrate increases the risk of cardiovascular problems. Men in 30 to 49 age group were highest at risk for heart diseases, while women between 50-59 years were at risk. In men, central obesity, lack of physical activity and change in dietary habits were the main reasons for dyslipidemia, while in women it was mainly hormonal changes brought on by menopause. A study was conducted to assess the prevalence and risk factors of coronary artery decease (CAD) in a native urban South Indian population. 1262 persons participated in the study. All the study respondents underwent a glucose tolerance test and were categorized as having normal glucose tolerance, impaired glucose tolerance as diabetes. Coronary artery disease was diagnosed by medical history & ECG findings. The result showed that the overall prevalence sate of CAD is 11%. The prevalence of rate of CAD were 9.1% in normal glucose tolerance test and 14.9% in patient with impaired glucose tolerance test. In diabetic patient CAD prevalence were 21.4% study also points out that prevalence of CAD increased with an increase in total cholesterol, low density lipoprotein, triglycerides and total cholesterol. Above statistics lead to a conclusion that the prevalence of CAD is rising rapidly in urban India.17 Material and method: Pre-experimental one-group pre-test - post-test research design was used to conduct the study. Based on the investigator's familiarity with the setting and availability of the samples the present study was conducted in General hospital Yelahanka, Bangalore. The sample size of the present study consists of 60 patients admitted to the selected hospital with coronary artery disease. Result: pre-test majority of them 40(66.67%) had moderate knowledge, 2(3.33%) had adequate knowledge and 18(30) had inadequate knowledge. In the post-test 16(26.67%) had moderate knowledge, 2(3.33%) had inadequate knowledge and 42(70) had adequate knowledge. the range, mean, SD, enhancement and paired 't' test value of knowledge score on prevention of complications of coronary artery disease in the pre-test and post-test. The obtained post-test Mean value 29 was higher than the pre-test 18.17. The enhancement between pre-test and post-test was 3.89 and obtained paired 't' test value was 21.76, it was highly significant at 5% level. Hence it is inferred that there is significant increase in the knowledge level of the respondents on prevention of complications of coronary artery disease after the administering self-instructional module. Conclusion: Coronary artery disease is a growing epidemic. Predictions by many cardiologists suggest that India will be the heart attack capital by 2020. One of the main aims of the nursing research is to contribute knowledge to the body of nursing to expand and broaden the scope of nursing. This is possible only if nurses are taking initiative to conduct further research. There is great need of nursing research in the area of public education, particularly with more emphasis on CAD and its prevention, since it is one of the leading causes of morbidity and mortality. Health-related studies need to concentrate on behaviour modification of people by developing unique teaching materials. Therefore, it is necessary to explore the knowledge of people with sedentary lifestyle and job patterns. This in turn will help the nurses to provide apt and prompt information to the public in the prevention of non-communicable diseases like CAD.