aortic valve heart sound (A2)

Aortic component of 2nd heart sound (S2), or A2, reflecting closure of the aortic valve which normally precedes P2 (closure of pulmonic valve). Loud A2: systemic hypertension Soft A2: aortic stenosis, heavily calcified aortic valve

References

Harrison's Principles of Internal Medicine, 13th ed. Companion Handbook, Isselbacher et al (eds), McGraw-Hill Inc. NY, 1995, pg 327