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1、=1.0sThis diagram illustrates ECG waves and intervals as well as standard time and voltage measures on the ECG paper. P wave duration：0.04s3=0.12sQRS complex duration：0.04s1.5=0.60sT wave duration：0.04s5=0.20sP-R interval：0.04s4=0.16sQ-T interval：0.04s9=0.36sR wave amplitude：0.1mV10=1.0mVCalculation
2、(300 / 6) = 50 bpm(1500 / 19) = 79 bpm(300 / 1.5) = 200 bpm33 x 6 = 198 bpmSchematic representation of normal ECGDurationDurationPR intervalThe QRS complex becomes progressively more upright across the chest wall from V1 to V6, a change known as R-wave progression.12 Lead ECG of a 26 year old male W
3、hat is the PR interval in this ECG?A.0.12 sec B. 0.16 sec C. 0.20 sec D. 0.28 sec E. 0.50 secWhat is the QRS duration seen here? A. 0.04 sec B. 0.06 sec C. 0.10 sec D. 0.12 sec E. 0.14Choose the correct QT interval for this ECG: A. 0.34 sec B. 0.40 sec C. 0.44 sec D. 0.48 sec E. 0.54 sec What is the
4、 approximate heart rate? A. 50 bpm B. 60 bpm C. 75 bpm D. 90 bpm E. 100 bpm Positive in l, negative in aVF, positive in ll normal QRS axis Determine the QRS axis for this ECG: Negative in l, positive in aVF right deviation axisDetermine the QRS axis for this ECG: What is the normal range of the QRS axis?A.0 degrees to 180 degrees B.0 degrees to +90 degrees C.-30 degrees to +90 degrees D.-90 degrees to +90 degrees E.-90 degrees to +30 degrees