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Characteristics of innocent childhood murmurs

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

  • no other abnormality - just a murmur
  • no thrill
  • the murmur usually has the characteristics listed below:
    • heard over a local area
    • does not radiate outside the praecordium
    • short, low frequency
    • occurs in early or midsystole
    • never diastolic
    • shows variation in intensity with changes in posture; may disappear completely with the Valsalva manoeuvre; sitting or deep inspiration makes the murmur quieter
    • increased with tachycardia e.g. crying, anxiety
    • ECG and chest X-ray normal
    • child is asymptomatic


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