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ECG interpretation

Join Dr. Shamim Nassrally, a Clinical Teaching Fellow, for an informative session on ECG interpretation. By the end of this session, you will be adept at systematically interpreting ECGs and recognizing essential ECG abnormalities such as acute coronary syndromes, myocardial infarctions, and common arrhythmias. We will cover fundamental concepts including demographics, rate, rhythm, axis, and specific wave characteristics like the P-wave, PR interval, QRS complex, ST segment, and T waves. Enhance your clinical skills and confidently assess ECGs.

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ECG interpretation

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  1. ECG interpretation Dr. Shamim Nassrally BSc (Hons) MB ChB MRCP(UK) Clinical Teaching Fellow

  2. Objectives By the end of this session you should be able to: • Interpret ECGs using a systematic approach • Recognise important ECG abnormalities: • acute coronary syndrome • acute myocardial infarction • common arrhythmias.

  3. Framework • Basic information/Demographics • Rate • Rhythm • Axis • P wave and PR interval • QRS complex • ST segment

  4. Basic information • Identifying information: name/unit number • Date/time • Voltage (10mm/mV) • Speed (25mm/s)

  5. Rate • 300/number large squares • Normal: 60-100bpm • <60 = bradycardia • >100 = tachycardia

  6. Rhythm • Are there P-waves? • Is each P followed by a QRS? • Is each QRS preceded by a P wave? • AF/atrial flutter • Supraventricular tachycardias • Heart block: • 1st degree • 2nd degree (Mobitz type 1 and type 2) • 3rd degree (complete heart block)

  7. P wave and PR interval • Normal P wave <2.5mm high, <0.11s • Normal PR interval 0.12-0.2s (3-5 small squares)

  8. Axis • I and II positive = normal axis • I positive + III negative = left axis deviation • I negative + III positive = right axis deviation

  9. QRS complex • Normal QRS <0.12s (3 small squares) • LVH criteria • Wide QRS • Left bundle branch block • Right bundle branch block

  10. ST segment • ST elevation: MI, left bundle branch block • ST depression: ischaemia, posterior MI, digoxin • T-wave: • Tall – hyperkalaemia, left bundle branch block • Flat – ischaemia, hypokalaemia

  11. Quiz • Rate • Rhythm • P wave, PR interval • Axis • QRS complex • ST segment • T waves

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