Cardiac Hypertrophy: EKG Characteristics
| General Characteristics of Hypertrophy 1. Increased amplitude of waves (positive or negative) 2. Axis shift: towards greater amount of muscle mass 3. Increased duration of waves *Right atrial enlargement (RAE) p-wave amplitude tall, peaked p-waves in II, III, aVF amplitude of p-wave > 2.5 mm QRS vector shifted down *Left atrial enlargement (LAE) biphasic p-wave in V1 notched OR long p-waves (any lead) *Right ventricular hypertrophy (RVH) Remember that each small box is 1 mm R-wave in V1 (equal or > 7 mm) RAE is present R wave progression is different Right axis deviation is common *Left ventricular hypertrophy (LVH) -QRS voltage 1. R in Lead I + S in Lead III equal or > 25 mm 2. S in V1 + R in V5 or V6 equal or > 35 mm 3. ST and T-wave abnormalities 4. LAE & Left axis deviation (common but not needed to call LVH) |
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