
Innocent Murmur
Definition
Non-pathological heart murmur in healthy children, unrelated to structural heart disease
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Symptoms
Asymptomatic with no cyanosis, syncope, failure to thrive, or dyspnoea
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Diagnosis: 7 S’s
Sensitive: Changes with position or respiration (softer when standing)
Short: Brief systolic murmur
Single: No extra heart sounds (e.g., clicks, gallops)
Small: Localised with no radiation
Soft: Low intensity (grade 1–3/6)
Sweet: Soft, blowing quality
Systolic: Ejection murmur with no diastolic component
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Negative Indicators
Cyanosis, tachypnoea, tachycardia, oedema, or fatigue
Abnormal growth or weight gain
Heaves, thrills, diastolic murmur, or other abnormal findings
Rare in infants <1 year, requiring evaluation for congenital heart disease
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Management
Reassurance: Educate parents on the benign nature of the murmur
Follow-up: Routine reviews to monitor for any changes
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When to Refer
Concerning signs such as failure to thrive, cyanosis, syncope, or exertional symptoms
Persistent murmur despite positional changes
Features not fitting the 7 S’s
Referral to a paediatric cardiologist for echocardiography
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