Techniques
left midclavicular line, fifth intercostal space
What is point of maximal impulse (PMI)/Mitral Valve/Apex
this heart sound is high pitched, dull in quality, and heard best at the apex
What is S1
The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole. S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.