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- AXIS: 
- 29 to + 100; 
- Normal QRS axis if R > S in both I and aVF; 
- Transition Zone: Between V3 - V4; 
- S wave > 5 mm in V1; 
- Short and Fat patients: more Leftward; 
- Tall and Thin: more Verticle to Rightward; 
- Pediatrics: Larger S wave in Chest Leads; * DURATION: Adults: usually < 0.08 sec; - 0.09 - 0.11 sec: Slight Intra Vent Conduction Delay; - Look for other EKG abnormalities; 
- Consider LVH, HyperK, quinidine, Procainamide; 
- Left Anterior Hemi Block 
- Greater than 0.12 sec: Consider Bundle Branch Block; * Poor R Wave Progression: 
- COPD - LVH (w/ Post Hypertrophy) - Ant MI