explain me 10 common heart disease with ecg changes and ecg images of those disease
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ECG changes myocardial infarction ST elevation
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atrial fibrillation ECG irregular rhythm absent P waves
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complete heart block third degree AV block ECG
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ventricular tachycardia ECG wide complex regular tachycardia
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left ventricular hypertrophy ECG voltage criteria Sokolow
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pulmonary embolism ECG S1Q3T3 right heart strain
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pericarditis ECG saddle shaped ST elevation diffuse PR depression
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Wolff-Parkinson-White syndrome ECG delta wave short PR interval
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hyperkalemia ECG peaked T waves wide QRS sine wave
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long QT syndrome ECG prolonged QT interval torsades de pointes
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10 common heart diseases ECG changes electrocardiogram findings clinical cardiology
Here is a comprehensive guide to 10 common heart diseases and their ECG changes, with real ECG images for each.
10 Common Heart Diseases: ECG Changes & Images
1. 🫀 ST-Elevation Myocardial Infarction (STEMI)
What it is
Complete occlusion of a coronary artery causing transmural (full-thickness) myocardial infarction. A true cardiac emergency requiring immediate reperfusion.
ECG Changes
| Finding | Detail |
|---|---|
| ST elevation | ≥1 mm in ≥2 contiguous limb leads; ≥2 mm in precordial leads |
| Hyperacute T-waves | Tall, peaked T-waves in the early (minutes) phase |
| Reciprocal ST depression | Mirror-image changes in opposing leads |
| Pathological Q-waves | Develop >6 hours after onset (>40 ms wide, >1/4 R height) |
| T-wave inversion | Late phase, indicating reperfusion or evolving infarction |
Localization:
- Anterior (LAD): V1–V4 elevation
- Inferior (RCA/LCx): II, III, aVF elevation
- Lateral (LCx): I, aVL, V5–V6 elevation
- Posterior (RCA/LCx): V1–V3 ST depression + tall R waves
ECG Image — Anterior STEMI (LAD Occlusion)
Convex "tombstone" ST elevation in V1–V6, hyperacute T-waves in V2–V4, reciprocal ST depression in II, III, aVF. Classic proximal LAD occlusion.
ECG Image — Inferior STEMI with Posterior Extension
ST elevation in II, III, aVF (inferior); prominent R waves and ST depression V1–V3 (posterior wall); reciprocal depression in I, aVL.
2. 🫀 Atrial Fibrillation (AF)
What it is
Chaotic, disorganized atrial electrical activity causing an irregularly irregular ventricular response. Most common sustained cardiac arrhythmia.
ECG Changes
| Finding | Detail |
|---|---|
| Absent P waves | Replaced by irregular fibrillatory (f) waves, best seen in V1 |
| Irregularly irregular R-R intervals | No pattern to QRS spacing |
| Narrow QRS | Unless aberrant conduction or pre-excitation |
| Variable ventricular rate | 60–180+ bpm depending on AV nodal conduction |
| Fibrillatory baseline | Undulating 350–600 Hz baseline activity |
ECG Image — Atrial Fibrillation with Rapid Ventricular Response
Classic AF: absent P waves replaced by fibrillatory baseline, completely irregularly irregular QRS complexes, rapid ventricular response.
3. 🫀 Complete (Third-Degree) AV Block
What it is
Total failure of conduction through the AV node — atria and ventricles beat completely independently. Life-threatening; requires permanent pacemaker.
ECG Changes
| Finding | Detail |
|---|---|
| AV dissociation | P waves and QRS have no fixed relationship |
| Regular P waves | Normal atrial rate (60–100 bpm) |
| Slow escape rhythm | Ventricular rate 20–40 bpm (infra-Hisian) or 40–60 bpm (junctional) |
| Wide QRS | If ventricular escape (>120 ms); narrow if junctional escape |
| Bradycardia | Ventricular rate independently slow |
ECG Image — Third-Degree AV Block
Complete AV dissociation: P waves "march through" QRS complexes with no fixed PR interval. Wide QRS escape rhythm at ~55 bpm — infra-nodal origin.
4. 🫀 Ventricular Tachycardia (VT)
What it is
Three or more consecutive ventricular beats at >100 bpm, originating below the bundle of His. Can degenerate into ventricular fibrillation.
ECG Changes
| Finding | Detail |
|---|---|
| Wide QRS tachycardia | QRS >120 ms (often >140–160 ms) |
| Rate 100–250 bpm | Regular monomorphic VT most common |
| AV dissociation | P waves independent of QRS (diagnostic when seen) |
| Fusion/capture beats | Pathognomonic of VT |
| Concordance | All V1–V6 positive or all negative |
| Northwest axis | Extremely negative QRS axis |
ECG Image — Monomorphic Ventricular Tachycardia
Wide QRS regular tachycardia at ~180 bpm. RBBB morphology with left axis deviation — classic fascicular VT. No visible P waves.
5. 🫀 Acute Pericarditis
What it is
Inflammation of the pericardial sac, usually viral. Causes sharp pleuritic chest pain, worse lying down, better sitting forward.
ECG Changes
| Finding | Detail |
|---|---|
| Diffuse saddle-shaped ST elevation | Concave (not convex) elevation in nearly ALL leads |
| PR segment depression | In most leads — highly specific for pericarditis |
| PR elevation in aVR | Reciprocal to PR depression elsewhere |
| ST depression only in aVR (±V1) | Unlike STEMI which is localized |
| Spodick's sign | Downsloping TP segment |
| No reciprocal ST depression | Distinguishes from STEMI |
ECG Image — Acute Pericarditis
Diffuse concave "saddle-shaped" ST elevation in I, II, III, aVF, V2–V6. PR depression in lead II (arrowed). ST depression and PR elevation in aVR. Classic pericarditis.
6. 🫀 Pulmonary Embolism (PE)
What it is
Thrombotic occlusion of pulmonary arteries causing acute right ventricular pressure overload. ECG changes reflect acute cor pulmonale.
ECG Changes
| Finding | Detail |
|---|---|
| Sinus tachycardia | Most common (>90% of cases) |
| S1Q3T3 pattern | Deep S in I, Q wave in III, inverted T in III |
| Right axis deviation | New rightward shift |
| RBBB | Complete or incomplete (right ventricular strain) |
| T-wave inversions V1–V4 | Right ventricular strain pattern |
| P pulmonale | Peaked P waves if severe |
ECG Image — Pulmonary Embolism (S1Q3T3 + Right Heart Strain)
Sinus tachycardia 116 bpm. S1Q3T3 pattern visible. T-wave inversions V1–V3 with incomplete RBBB — classic acute right heart strain from PE.
7. 🫀 Left Ventricular Hypertrophy (LVH)
What it is
Pathological increase in left ventricular muscle mass, most commonly from chronic hypertension, aortic stenosis, or hypertrophic cardiomyopathy.
ECG Changes
| Finding | Detail |
|---|---|
| High QRS voltage | Sokolow-Lyon: SV1 + RV5/V6 ≥35 mm |
| Cornell criteria | RaVL + SV3 >28 mm (men), >20 mm (women) |
| Left axis deviation | QRS axis −30° or more leftward |
| LV strain pattern | ST depression + T-wave inversion in V5–V6, I, aVL |
| Left atrial enlargement | Wide notched P wave (P mitrale) |
| Poor R-wave progression | Secondary finding |
ECG Image — LVH with Strain Pattern
High QRS voltage meeting Sokolow-Lyon criteria. ST depression and T-wave inversions in II, III, aVF, V5, V6 — classic "strain pattern" indicating severe hypertrophy.
8. 🫀 Wolff-Parkinson-White (WPW) Syndrome
What it is
Pre-excitation syndrome caused by an accessory conduction pathway (Bundle of Kent) that bypasses the AV node, allowing early ventricular activation.
ECG Changes
| Finding | Detail |
|---|---|
| Short PR interval | <120 ms (bypasses AV nodal delay) |
| Delta wave | Slurred initial upstroke of QRS |
| Wide QRS | ≥120 ms (fusion of delta wave + normal conduction) |
| Secondary ST-T changes | Discordant T-waves due to abnormal depolarization |
| Pseudo-infarction | Negative delta waves mimic Q waves |
| Risk of AF → VF | Rapid conduction via accessory pathway is dangerous |
ECG Image — WPW Syndrome
Sinus rhythm with classically short PR interval (<120 ms). Prominent delta waves slurring QRS onset in II, III, aVF, V2–V6. Widened QRS duration — classic WPW triad.
9. 🫀 Long QT Syndrome (LQTS)
What it is
Congenital or acquired disorder of cardiac repolarization causing a prolonged QT interval, predisposing to Torsades de Pointes (TdP) — a potentially fatal polymorphic VT.
ECG Changes
| Finding | Detail |
|---|---|
| Prolonged QTc | >440 ms (men), >460 ms (women); dangerous >500 ms |
| Corrected QT (QTc) | QT ÷ √RR (Bazett's formula) |
| T-wave morphology | Notched, biphasic, or broad T-waves depending on LQTS subtype |
| T-wave alternans | Beat-to-beat variation in T-wave amplitude — high-risk sign |
| Torsades de Pointes | Polymorphic VT with twisting QRS around isoelectric line |
| "R on T" phenomenon | Triggers TdP — PVC landing on T-wave |
ECG Image — Long QT with Torsades de Pointes
Panel (a): Baseline sinus rhythm with markedly prolonged QTc = 478 ms. Panel (b): Onset of Torsades de Pointes — polymorphic VT with characteristic "twisting" of QRS complexes around the isoelectric line.
10. 🫀 Hyperkalemia (Electrolyte Cardiac Emergency)
What it is
Elevated serum potassium (>5.5 mmol/L) causing progressive ECG changes that can lead to fatal arrhythmias if untreated. Common in renal failure, Addison's disease, acidosis.
ECG Changes (Progressive with Rising K⁺)
| K⁺ Level | ECG Change |
|---|---|
| 5.5–6.5 mmol/L | Peaked ("tented") T-waves — narrow base, tall amplitude |
| 6.5–7.0 mmol/L | PR prolongation, flattened/absent P waves |
| 7.0–8.0 mmol/L | Wide QRS (>120 ms), intraventricular conduction delay |
| >8.0 mmol/L | Sine-wave pattern — QRS merges with T-wave |
| >10 mmol/L | Ventricular fibrillation or asystole |
ECG Image — Severe Hyperkalemia
Severe hyperkalemia (K⁺ = 9.2 mmol/L): absent P waves (atrial standstill), massively widened QRS complexes, tall peaked T-waves with sine-wave appearance in precordial leads. Critical emergency.
Quick Reference Summary
| # | Condition | Key ECG Feature |
|---|---|---|
| 1 | STEMI | Convex ST elevation in contiguous leads + reciprocal changes |
| 2 | Atrial Fibrillation | Absent P waves + irregularly irregular rhythm |
| 3 | Complete Heart Block | AV dissociation + slow escape rhythm |
| 4 | Ventricular Tachycardia | Wide QRS tachycardia >100 bpm + AV dissociation |
| 5 | Acute Pericarditis | Diffuse saddle-shaped ST elevation + PR depression |
| 6 | Pulmonary Embolism | Sinus tachycardia + S1Q3T3 + RV strain |
| 7 | LV Hypertrophy | High QRS voltage + lateral strain pattern |
| 8 | WPW Syndrome | Short PR + delta wave + widened QRS |
| 9 | Long QT Syndrome | QTc >500 ms + T-wave alternans → Torsades |
| 10 | Hyperkalemia | Peaked T-waves → wide QRS → sine wave |
Clinical Pearl: Always interpret the ECG in clinical context. The same ECG change (e.g., ST elevation) can appear in STEMI, pericarditis, Brugada syndrome, or LV aneurysm — history and troponins are essential for accurate diagnosis.
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