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I and aVL
Left side of the heart in a vertical plane
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II, III, and aVF
Inferior (diaphragmatic) side of the heart
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aVR
Right side of the heart in a vertical plane
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V1 and V2
Right Ventricle
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V3 and V4
Interventricular septum and the anterior wall of the left ventricle.
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V5 and V6
Anterior and lateral walls of the left ventricle
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Triplicate method
300, 150, 100, 75, 60, 50
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- Sinus Bradycardia Rate - > 60
- Rhythm - regular
- Pacemaker site - SA node
- P waves - upright and normal in morphology
- PR interval - normal
- ORS complex - normal (0.04-0.12 sec)
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- Sinus Tachycardia
- Rate > 100bpm
- Rhythm-regular
- Pacemaker- SA node
- P waves - upright and normal in morphology
- QRS complex - normal
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- Sinus Dysrhythmia
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Rate- 60-100 - Rhythm - irregular
- Pacemaker site - SA node
- P waves - upright and normal in morphology
- PR interval - normal
- QRS complex - normal
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Wandering Atrial Pacemaker
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Muiltifocal Atrial Tachycardia
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Premature atrial complexes
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LVH
- Any precordial lead is > 45mm
- The R wave in aVL is > 11mm
- The R wave in lead I is > 12mm
- The R wave in lead aVF is > 20mm
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The 3 Major criteria for RBBB are:
- QRS > 0.12 seconds
- Slurred S wave in leads I and V6RSR' pattern in V1
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Three Major criteria for LBBB
- Duration > 0.12 seconds
- Broad, monomorphic R waves in I and V6 with no Q waves
- Broad, monomorphic S waves in V1; may have a small r wave
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Criteria for Dx LAH
- left axis deviation c the axis at -30o to -90o
- either a qR complex or an R wave in lead I
- an rS complex in lead III, and probably also in II and aVF
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Criteria for diagnosing LPH
- an axis of 90 to 180o (the right quadrant)
- an s wave in lead I and a q in III
- exclusion of RAE and /or RVH
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Infarction ventricular aneurysm
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Early repolarization pericarditis
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RCA
right coronary artery
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LAD
left anterior descending
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inferior -RV
proximal RCA
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Isolated posterior
RCA, LCx
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Anteroseptal-lateral
Proximal LAD
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Anterolateral, inferolateral, or posterolateral
LCx
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