If you’re anything like me, you’re bothered by very loud noises. Cars honking, planes roaring overhead, the sound of a jackhammer, they all seem to stress me out. According to some new research, loud ...

S1 is the first heart sound that doctors can hear using a stethoscope. The vibrations that occur when the mitral and tricuspid valves in the heart close produce the S1 sound. There are two common ...