Which heart exam findings are associated with heart damage in the setting of myocardial infarction (MI, heart attack)?

Updated: May 07, 2019
  • Author: A Maziar Zafari, MD, PhD, FACC, FAHA; Chief Editor: Eric H Yang, MD  more...
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Answer

On palpation, lateral displacement of the apical impulse, dyskinesis, a palpable S4 gallop, and a soft S1 sound may be found. These signs indicate diminished contractility of the compromised left ventricle.

Paradoxical splitting of S2 may reflect the presence of left bundle-branch block or prolongation of the pre-ejection period with delayed closure of the aortic valve, despite decreased stroke volume.

A new mitral regurgitation murmur (typically holosystolic near the apex) indicates papillary muscle dysfunction or rupture, or mitral annular dilatation; it may be audible even when cardiac output is substantially decreased.

A holosystolic murmur that radiates to the midsternal border and not to the back, possibly with a palpable thrill, suggests a ventricular septal rupture; such a rupture may occur as a complication in some patients with full-thickness MIs. With resistive flow and an enlarged pressure difference, the ventricular septal defect murmur becomes harsher, louder, and higher in pitch than before.

A pericardial friction rub may be audible as a to-and-fro rasping sound; it is produced through sliding contact of inflammation-roughened surfaces.


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