ECG 2

ECG 2

1. LV Hypertrophy: tall R waves (>25mm) in lead I, aVL, V5,V6, deep S waves (>25mm) in V1& V2 or total of R wave in V5/6 plus S wave in V1/2 = >35mm

2. RV hypertrophy: dominant R wave (V1), R axis deviation, deep S wave (V5,6), RBBB)

3. LBBB: broad QRS complex, small Q wave in V1 (W shape), small R wave in V6 (M shape)

4. RBBB: broad QRS, Small R in V1 (M shape), small Q in V6 (W shape)

5. Bundle branch blocks: WilliaM MorroW

6. Dominant R waves in V1: RBBB, RVH, Posterior MI, Wolff-Parkinson-White, dextrocardia, hypertrophic cardiomyopathy (normal in children and young adults)

7. STEMI features and changes

   • 1) Tall hyperacute T waves
     • 2) ST elevation
       • Hours/days: Q wave formation (>2mm deep/>1mm wide) *permanent*
         • T wave inversion
           • ST back to normal