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Basic EKG Block 2 Small box = 0.04 seconds P wave QRS complex T wave Normal Sinus Rhythm Large box = 0.20 seconds 5 large squares = second 300 large squares = minute 15 blocks = 3 second strip 30 blocks = 6 second strip What is P, QRS, T? • The electrical conduction of the heart uses these letters P, Q, R, S, T • A wave of atrial depolarization enters the AV node – “P” wave then a pause before QRS • Depolarization of the entire ventricular myocardium (contraction) produces the QRS • ST segment is horizontal baseline…then the “T” wave appears- the “T” wave is rapid ventricular repolarization 1. Do you see P waves? 2. Do you see QRS after every P wave? 3. What is the rate? Is it normal, too fast, or too slow? 4. Is it regular or irregular? 5. What do the P and QRS waves look like? Sinus Tachycardia 1. Do you see P waves? 2. Do you see QRS after every P wave? 3. What is the rate? Is it normal, too fast, or too slow? 4. Is it regular or irregular? 5. What do the P and QRS waves look like? Sinus Bradycardia • • • • • Do you see P waves? Do you see QRS after every P wave? What is the rate? Is it regular or irregular? What do the P and QRS waves look like Atrial Fibrillation Normal Sinus Rhythm with PVC’s. Ventricular Tachycardia Ventricular Fibrillation Asystole
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