Cardiac Assessment

The difference between hearing S1-S2 and knowing what you're hearing can determine whether you catch a murmur, a gallop, or an emergency before it declares itself.

Cardiac assessment centers on the precordium — inspection, palpation, and auscultation of the heart itself, not the peripheral vessels. Begin with the patient positioned at 30–45 degrees. Inspect for visible pulsations or heaves at the PMI (point of maximal impulse), normally at the 5th intercostal space, midclavicular line. A laterally displaced PMI suggests cardiomegaly. Palpate the PMI — it should feel like a gentle tap in an area no larger than a quarter. Auscultate using the diaphragm for high-pitched sounds (S1, S2, aortic regurgitation murmurs) and the bell for low-pitched sounds (S3, S4, mitral stenosis murmurs). Follow a systematic landmark sequence: aortic (2nd right ICS), pulmonic (2nd left ICS), Erb's point (3rd left ICS), tricuspid (4th left ICS), mitral/apical (5th left ICS, MCL). S1 is loudest at the apex (mitral closure), S2 is loudest at the base (aortic closure). S3 can be normal in young adults but in adults over 30 signals volume overload — think heart failure. S4 always indicates a stiff, noncompliant ventricle — think hypertension or hypertrophic cardiomyopathy. Grade murmurs I–VI: grade I is barely audible, grade IV+ has a palpable thrill.

Key Distinctions

Don't confuse S3 (early diastole, 'Ken-TUC-ky') with S4 (late diastole, 'TEN-nes-see') — S3 follows S2, S4 precedes S1. Students mix up diaphragm versus bell: diaphragm pressed firmly for high-pitched sounds, bell held lightly for low-pitched sounds — pressing the bell hard converts it into a diaphragm. Cardiac assessment covers the precordium; peripheral pulses, capillary refill, and edema belong in the peripheral vascular assessment sibling.

Clinical Pearl

APE To Man: Aortic, Pulmonic, Erb's, Tricuspid, Mitral — landmarks in order from the patient's right 2nd ICS down and across to the apex.