Left Bundle Branch Block EKG Findings
1. Lead V1
  1. QS or rS
2. Lead V6
  1. Late intrinsicoid deflection
  2. No Q wave
  3. Monophasic R Wave
3. Lead I
  1. Monophasic R Wave
  2. No Q wave
Right Bundle Branch Block EKG Findings
1. Lead V1
  1. Late Intrinsicoid Deflection
  2. M-shaped QRS Complex
  3. Wide R Wave or qR (occasionally)
2. Lead V6
  1. Early Intrinsicoid Deflection
  2. Wide S wave
3. Lead I
  1. Wide S wave
Left Anterior Hemiblock EKG Findings
1. Left Axis Deviation (beyond -60 degrees)
2. Small Q wave in Lead I
3. Small R Wave in Lead III
4. Normal QRS Duration
5. No Right Ventricular Hypertrophy
Left Posterior Hemiblock EKG Findings
1. Right Axis Deviation (beyond +120 degrees)
2. Small R Wave in Lead I
3. Small Q wave in Lead III
4. Normal QRS Duration
5. No Right Ventricular Hypertrophy

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 5/10/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.