This document summarizes the interpretation of an electrocardiogram (ECG) for a 53-year-old man. The ECG shows normal sinus rhythm at a rate of 60 beats per minute, with normal P waves, PR interval, QRS duration and axis, and no signs of atrial or ventricular enlargement, bundle branch blocks, or myocardial infarction. The overall interpretation is that the ECG is normal.

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

5. ID 380 - NORMAL SINUS RHYTHM, 60/min
There are no signs of left atrial enlargement or right atrial enlargement

6. ID 380 - NORMAL SINUS RHYTHM, 60/min
Let’s now look at the QRS complexes: There is normal QRS axis (between 0 and 90 degrees)

7. ID 380 - NORMAL SINUS RHYTHM, 60/min
The QRS duration is normal : There is no right bundle branch block, left bundle branch block or non-specific block

8. ID 380 - NORMAL SINUS RHYTHM, 60/min
There is no right ventricular hypertrophy or left ventricular hypertrophy

9. ID 380 - NORMAL SINUS RHYTHM, 60/min
There are no QRS signs of myocardial infarction – There are normal ST segment and normal T waves

10. ID 380 - Final diagnosis:
NORMAL SINUS RHYTHM, 60/min
NORMAL ECG