ACS - ECG

Reciprocal Changes

1. Anterior STEMI
   • Reciprocal ST-segment depression in at least one of leads II, III, aVF
   • Occurs in 40-70% of cases
2. Inferior STEMI
   • Reciprocal ST-segment depression usually present in I, aVL; often in V1-V3
   • Occurs in 56% of cases
3. Posterior STEMI
   • Reciprocal ST-segment depression in V1-V4
     • Differentiate from inf STEMI reciprocal depression based on upright T waves, posterior leads showing STEMI
   • Often associated w/ ST-segment elevation in II, III, aVF (inferior involvement)

See Also

• ACS - Anatomical Correlation
• ACS - Risk Stratification
• ECG (Main)

Source

• Electrocardiography in Emergency Medicine. ACEP Textbook.