1、The most fundamental distinction is between systolic ejection murmurs and pansystolic murmurs.
2、Pansystolic murmurs begin with S1, extend throughout systole, and are characteristically uniform in intensity Systolic ejection murmurs have been likened to the chug of a steam engine laboring up a hill, while pansystolic murmurs have been likened to the high-pitched wail of the engine's whistle.
