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Introduction:The guidelines to prophylaxis of infectious endocarditis changed, but many congenital heart diseases continue to be considered as high risk for the development of the disease.Objective: To evaluate the knowledge of parents or guardians of children and adolescents with congenital heart disease seen at a referral center in Rio Grande do Sul, Brazil on infective endocarditis and its prevention.Methods: Cross-sectional study with 90 patients with congenital heart defects in regular outpatient treatment. The parents' knowledge was assessed using a specific questionnaire and other data were obtained through medical records.Results: The median age of patients was 5.6 years (3 months -14 years), being 57,7% males. The median follow-up time in service was 3.49 years (1.20-7.38). The years of formal schooling of the parents had a mean of 7.67 ± 3.25 years. According to the score previously established, the knowledge of the interviewed parents was considered satisfactory in 37.7%, regular in 33.3% and unsatisfying in 28,8%. There was significant correlation between the index of parentsḱ nowledge and monitoring of children at service (r=0.584; P=0.796). There was no correlation between parentsé ducation and knowledge of them (r=0.028; P=0.796). Conclusion:The parents' knowledge about endocarditis and its prevention was inadequate, requiring greater attention to the orientations passed in consultations.Descriptors: Primary Prevention. Endocarditis. Knowledge. Resumo

In a referral outpatient clinic the proportion of minor lesions is high in patients with diagnosis of innocent murmur. These injuries may not be related to the heart murmur, as in the patent foramen ovale and bicuspid aortic valve. However, they raise the question of the indication of echocardiogram taking into account the low risk of detected lesions and, on the other hand, the resolutive character of a daycare reference center.