guitarchica,
Sorry to hear about your brother's troubles. The significance of the
murmurHeart murmurs and other sounds could range from minor to
majorMajor tears
Major-gesic. Many 15 year-old males have "functional"
murmursHeart murmurs and other sounds, which basically means that no structural heart disease exists. On the other
handHand or foot spasms
Hand tremor, any person diagnosed with a murmur needs to be evaluated by a doctor so that the appropriate tests, if any, can be ordered. If your brother uses injection drugs (iv drugs, shooting up), then he could have potentially damaged one of his heart valves, which would certainly warrant further investigation.
Having written all that, your brothers most important medical problem by a long shot is the drug abuse. Let him know you love him and help him help himself. The murmur will wait.
Hope that helps.
Is 108lbs for 5 7' too thin ? Does this have a bearing on heart tests ? Since I have had them at different weights over 7 years.