Abnormal and "Innocent" Heart Murmurs | American Heart Association
https://www.heart.org/en/health-topics/heart-valve-problems-and-disease/heart-valve-problems-and-causes/innocent-heart-murmur
WEBMay 8, 2020 · Clues about the cause can be based on the loudness, location and quality of the murmur. Loudness is graded from 1 to 6. A grade of 1 is very faint, heard only with a special effort. A grade 6 is extremely loud and can be heard with a stethoscope even without touching the chest.
DA: 53 PA: 50 MOZ Rank: 63