Introduction: One of the primary causes of morbidity and mortality in the world and in the Republic of Croatia is diseases of the cardiovascular system. Cardiovascular rehabilitation measures can be implemented in an outpatient or inpatient setting when patients recover after a cardiovascular event or intervention in the heart. Istrian health centers implement an outpatient cardiovascular rehabilitation program. The primary issue is the application of measures and knowledge gained during cardiovascular rehabilitation in later life. Establishing the continuity of the application of recommendations for changing the lifestyle of patients during outpatient cardiovascular rehabilitation was the main objective of this research. Subjects and methods: 51 patients participated in the research, all of whom were participants in the ambulatory cardiovascular rehabilitation program of the Istrian health centers branch in Pula. In Google Forms, a questionnaire about physical activity, adherence to Mediterranean diet rules, and additional medical recommendations was filled out by respondents. Results: The results showed that the majority of respondents engage in regular physical activity, but most do not adhere to the rules of the Mediterranean diet. The majority of examinees were labeled as having poor adherence to additional medical recommendations. Conclusions: The lifestyle habits adopted during outpatient cardiovascular rehabilitation are partially adhered to by patients. Conducting more research with a larger number of respondents is necessary to obtain more relevant data.