ECG Cheat Sheet.pdf - RATE 300 150 100 AXIS DEVIATION Normal Left Right 75 60 50 Lead I QRS 43 NORMAL SINUS RHYTHM \u2022 Is there a P wave for every QRS

ECG Cheat Sheet.pdf - RATE 300 150 100 AXIS DEVIATION...

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HYPERTROPHY LVH R wave in V5 or V6 >25mm S wave in V1 or V2 >25mm Sum of R wave in V5 or V6 + S wave in V1 >35mm RVH R wave > S wave in V1 LEFT ATRIAL ENLARGEMENT (P mitrale) P wave > 0.12s (3 small squares) and bifid in lead II RIGHT ATRIAL ENLARGEMENT (P pulmonale) P wave > 0.25mV (2.5 small squares) in lead II NORMAL SINUS RHYTHM Is there a P wave for every QRS? Is there a QRS for every P wave? P wave upright in lead II and inverted in lead aVR ? RATE 300 150 100 75 60 50 43 LVH RVH LAE RAE AXIS DEVIATION Normal Left Right Lead I QRS + + - Lead II QRS + - + Q WAVES Normal in leads aVl, I, II, V5, V6 Normal on expiration in lead III PATHOLOGICAL Q WAVES > 2 small squares deep >25% of height of following R wave in depth >1 small square wide ST SEGMENT ELEVATION Anterior MI = V1-V4 Lateral MI = I, aVL, V5-V6 Anterolateral MI = I, aVL, V1-V6 Anteroseptal MI = V1-V3 Inferior MI = II, III, aVF Inferolateral MI = I, aVL, V5-V6, II, III, aVF ST SEGMENT DEPRESSION Acute posterior MI R waves in leads V1-V3 ST depression in V1-V3 Upright, tall T waves Myocardial ischemia LATERAL MI ANTERIOR MI INFERIOR MI POSTERIOR MI ANTERIOR ST DEP. WITH ANGINA NORMAL ECG TALL T WAVES Should be no more than 1/2 preceding QRS (as a general guide) SMALL T WAVES Evaluation is subjective INVERTED T WAVES Normal in leads aVR, V1 Normal in lead V2 in young pts
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