14/03/2026
Interpretations of Electrocardiogram for some pathology of the Heart
1. Myocardial Infarction (Heart Attack)
Key ECG Features
ST-segment elevation in contiguous leads
Pathological Q waves
T-wave inversion
Examples
ST elevation in II, III, aVF → Inferior MI
ST elevation in V1–V4 → Anterior MI
2. Atrial Fibrillation
ECG Findings
Irregularly irregular rhythm
No visible P waves
Variable R–R intervals
3. Atrial Flutter
ECG Findings
Saw-tooth flutter waves
Atrial rate about 250–350 bpm
Often 2:1 AV conduction
4. Ventricular Tachycardia
ECG Findings
Wide QRS complexes
Regular fast rhythm (>120 bpm)
Possible AV dissociation
⚠️ Medical emergency
5. Ventricular Fibrillation
ECG Findings
Chaotic, irregular waves
No identifiable P, QRS, or T waves
⚠️ Requires immediate defibrillation
6. Heart Block
First-degree AV block
PR interval > 0.20 s
Second-degree AV block
Some P waves not followed by QRS
Third-degree AV block
Complete dissociation between P waves and QRS complexes
7. Hyperkalemia
ECG Findings
Tall peaked T waves
Wide QRS
Absent P waves (severe cases)
8. Hypokalemia
ECG Findings
Flat T waves
Prominent U waves
ST depression
9. Pericarditis
ECG Findings
Diffuse ST elevation
PR segment depression
10. Pulmonary Embolism
Possible ECG Pattern
S1Q3T3 pattern
Sinus tachycardia
Right heart strain
Quick way to read any ECG
Rate
Rhythm
P waves
PR interval
QRS complex
ST segment
T waves