Up to 25% of children may have a benign murmur that will resolve by age 12. The murmur sound is often caused by:
1. Constriction of the bronchi.
2. Rheumatoid arthritis in the vertebrae.
3. Turbulent blood flow at the aorta or pulmonary artery.
4. 3rd degree heart block.
3
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1. Constriction of the bronchi will cause wheezing and is not related to a murmur.
2. Rheumatoid arthritis does not create the sound of a murmur. This affects the joints.
3. The majority of benign murmurs in children have this origin.
4. Heart block is not benign and will change the rhythm of the heart. This will not cause a benign murmur.
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