Examine the net QRS deflection in leads I and aVF to locate the electrical axis: Lead I Deflection Lead aVF Deflection Axis Interpretation Normal Range Positive ( ↑up arrow Positive ( ↑up arrow Positive ( ↑up arrow Negative ( ↓down arrow Left Axis Deviation (LAD) Negative ( ↓down arrow Positive ( ↑up arrow Right Axis Deviation (RAD) Negative ( ↓down arrow Negative ( ↓down arrow Extreme Axis Deviation
): Suggests pre-excitation syndromes like Wolff-Parkinson-White (WPW), look for a . QRS Complex Normal Duration: Incomplete Block: Complete Block: Pathological Q Waves: Width 12 lead ecg interpretation cheat sheet pdf
This is the heart (pun intended) of the cheat sheet. You need to know which leads look at which part of the heart. Examine the net QRS deflection in leads I