Stepwise interpretation of ECG ID175
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A 58-year-old man with coronary artery disease was followed in the Cardiac Clinic. An electrocardiogram found normal sinus rhythm at 88 beats per minute with left bundle branch block, evidenced by a prolonged QRS duration of 145 milliseconds and abnormal depolarization that can mask other conditions.
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Stepwise interpretation of ECG ID175
- 1. ID 175 – 58 year old man followed in the Cardiac Clinic because of coronary artery disease
- 2. ID 175 – 58 year old man followed in the Cardiac Clinic because of coronary artery disease Can you see P waves?
- 3. ID 175 – Normal sinus rhythm, 88/min. Yes. There is sinus rhythm, 88/min. Each P is followed by a QRS complex, with a constant P-R interval (140 msec)
- 4. ID 175 – Normal sinus rhythm, 88/min. There are no signs of right or left atrial enlargement
- 5. ID 175 Normal Sinus rhythm, 88/min. Left bundle branch block The QRS duration is prolonged (145 msec.), with a pattern of Left Bundle Branch Block (LBBB)
- 6. ID 165 Normal Sinus rhythm, 88/min. Left bundle branch block The presence of LBBB may mask the diagnosis of left ventricular hypertrophy and/or myocardial infarction
- 7. ID 165 Normal Sinus rhythm, 88/min. Left bundle branch block In left bundle branch block the abnormal depolarization is usually associated with secondary abnormal repolarization (ST depression and negative T in the leads showing a broad R wave)
- 8. ID 165 Final diagnosis: Normal Sinus rhythm, 88/min. Left bundle branch block