STEMI

• ST-segment elevation ≥ 1mm in two contiguous leads
• : ≥ 2mm V2-V3
• : ≥ 1.5mm V2-V3

Posterior STEMI

• ST-segment depression V1-V3 Posterior ECG
• ST-segment elevation ≥ 0.5mm in V7-V9

Elevation

• Concordant ST-segment elevation ≥ 1mm in any lead (5 points)

Depression

• Concordant ST-segment depression ≥ 1mm in V1-V3 (3 points)

Discordant Elevation

• Discordant ST-segment elevation ≥ 5mm in any lead (2 points)

Benign Early Repolarization

• Concave ST-segment elevation
• Notch at J-point
• Asymmetric T-waves (steeper descent)

Pericarditis

• Diffuse ST-segment elevation (except aVR)
• PR-segment depression
• Ratio: ST-elevation to T-wave amplitude ≥ 0.25 in V6 suggests pericarditis

LVH Strain

• ST-segment elevation in V1-V3 in the setting of LVH

LV Aneurysm

• Q-waves with ST-segment elevation in precordial leads

Wellens: Type A

• Suggestive of proximal LAD lesion
• See Article

Wellens: Type B

Q-waves

• ≥ 40ms duration
• Depth ≥ 25% of R-wave height

ARVD

• Epsilon wave

Brugada Syndrome: Type 1

• Type 1: Coved ST-segment elevation

Brugada Syndrome: Type 2

• Type 2: Saddle-back ST-segment elevation

HCM

• Deep, narrow Q-waves

Wolff-Parkinson-White

• Shortened PR-interval
• Delta-wave

Atrial Abnormalities

1. Normal
2. RAA: P-wave amplitude > 2.5mm in inferior leads
3. LAA: P-wave duration increased (terminal negative portion >0.04s), amplitude of terminal negative component >1mm below isoelectric line in V1

Left Bundle Branch Block

• QRS duration > 0.12s (3 boxes)
• Broad or notched R-wave with prolonged upstroke in I, aVL, V5, V6
• Associated ST-segment depression and T-wave inversion
• Reciprocal changes in V1, V2 (deep S-wave)
• Possible LAD

Right Bundle Branch Block

• QRS duration > 0.12s (3 boxes)
• RSR’ in V1, V2
• Reciprocal changes in I, aVL, V5, V6 (deep S-wave)