Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Innocent or functional murmurs are the most common, present at some point in 50% to 90% of children, typically between 2 and 7 years of age. (SOR B, based on a cohort study.) Systolic murmurs due to systemic diseases or infections are the next most common, with anemia being the most frequent cause. (SOR C, based on a narrative review.) Congenital heart disease is the least common cause of a systolic murmur, occurring in less than 1% of the general population. (SOR B, based on a systematic review of cohort studies.)