Si is softer than S2 at the base (right and left 2nd interspaces).

Si is often but not always louder than S2 at the apex.

Si is accentuated in (1) tachycardia, rhythms with a short PR interval, and high cardiac output states (e.g., exercise, anemia, hyperthyroidism), and (2) mitral stenosis. In these conditions, the mitral valve is still open wide at the onset of ventricular systole, and then closes quickly.

Diminished S1

Varying Si

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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