1. Stepwise interpretation of ECG ID 380 – Normal ECG

2. ID 380 – 53 year old man in the pre-anaesthesia clinic

3. ID 380 – 53 year old man in the pre-anaesthesia clinic Can you see P waves?

4. Yes: The P waves originate from the sinus node– The rhythm is regular – Each P is followed by a QRS - The PR interval is normal – The rate is 60/min NORMAL SINUS RHYTHM, 60/min ID 380 – 53 year old man in the pre-anaesthesia clinic

5. There are no signs of left atrial enlargement or right atrial enlargement ID 380 – 53 year old man in the pre-anaesthesia clinic

6. Let’s now look at the QRS complexes: There is normal QRS axis (between 0 and 90 degrees) ID 380 – 53 year old man in the pre-anaesthesia clinic

7. The QRS duration is normal : There is no right bundle branch block, left bundle branch block or non-specific block ID 380 – 53 year old man in the pre-anaesthesia clinic

8. There is no right ventricular hypertrophy or left ventricular hypertrophy ID 380 – 53 year old man in the pre-anaesthesia clinic

9. There are no QRS signs of myocardial infarction – There are normal ST segment and normal T waves ID 380 – 53 year old man in the pre-anaesthesia clinic

10. ID 380 – Final diagnosis: NORMAL SINUS RHYTHM, 60 bpm. NORMAL ECG