Explain me 10 common heart disease with ecg changes and ecg images of those disease

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ECG electrocardiogram myocardial infarction ST elevation STEMI

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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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left ventricular hypertrophy ECG voltage criteria

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Wolff-Parkinson-White syndrome ECG delta wave short PR interval

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pericarditis ECG saddle-shaped ST elevation diffuse PR depression

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ventricular tachycardia ECG wide QRS complex

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pulmonary embolism ECG S1Q3T3 right heart strain

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hypertrophic cardiomyopathy ECG deep Q waves LVH strain

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heart failure dilated cardiomyopathy ECG bundle branch block LBBB

Here is a comprehensive guide to 10 common heart diseases with their ECG changes and representative ECG images.

10 Common Heart Diseases: ECG Changes & Images

1. 🫀 ST-Elevation Myocardial Infarction (STEMI)

ECG Changes

Hyperacute T-waves (earliest sign — tall, peaked, broad-based)
ST-segment elevation ≥1 mm in ≥2 contiguous limb leads, or ≥2 mm in ≥2 contiguous precordial leads
Reciprocal ST depression in opposing leads
Pathological Q waves (evolve within hours; indicate transmural necrosis)
T-wave inversion (late phase)
ST elevation morphology is typically convex ("tombstone") upward

Localisation by leads:

Territory	Leads with ST↑	Artery
Anterior	V1–V4	LAD
Inferior	II, III, aVF	RCA
Lateral	I, aVL, V5–V6	LCx
Posterior	V7–V9 (ST depression V1–V3)	RCA/LCx

Anterior STEMI ECG — ST elevation V1-V6 with tombstoning morphology, LAD occlusion

Anterior STEMI: Pronounced ST elevation with "tombstone" morphology in V2–V5, evolving QS waves, consistent with proximal LAD occlusion.

Inferolateral STEMI — ST elevation II, III, aVF, V5-V6 with reciprocal depression

Inferolateral STEMI: ST elevation (green circles) in II, III, aVF, V4–V6; reciprocal ST depression (yellow arrows) in I, aVL, V2–V3.

2. 🫀 Non-ST Elevation Myocardial Infarction (NSTEMI) / Unstable Angina

ECG Changes

ST depression ≥0.5 mm in ≥2 contiguous leads (horizontal or downsloping)
T-wave inversion (symmetric, deep; especially in anterior leads)
Transient ST elevation (resolves within 20 min; Prinzmetal variant)
No pathological Q waves (no full-thickness necrosis)
ECG may be normal in up to 5% of cases — troponin is key

3. 🫀 Atrial Fibrillation (AF)

ECG Changes

Absent P waves — replaced by chaotic fibrillatory (f) waves at 350–600/min, best seen in V1 and II
Irregularly irregular R-R intervals (hallmark sign)
Narrow QRS complexes (unless aberrant conduction/bundle branch block)
Ventricular rate typically 100–160/min if uncontrolled (AF with RVR)
Baseline undulation (fine or coarse fibrillatory waves)

Atrial Fibrillation ECG — absent P waves, irregularly irregular rhythm, rapid ventricular response

AF with RVR: Absent P waves replaced by chaotic baseline, irregularly irregular QRS complexes, narrow morphology indicating supraventricular origin.

4. 🫀 Complete (Third-Degree) AV Block

ECG Changes

Complete AV dissociation: P waves and QRS complexes fire independently
Regular P waves at normal atrial rate (60–100/min)
Regular, slow QRS escape rhythm (40–60/min if junctional; <40/min if ventricular)
Wide QRS if escape is ventricular in origin (>120 ms)
Narrow QRS if escape pacemaker is junctional (above His bundle)
No fixed PR interval — P waves "march through" the QRS and T waves

Complete Third-Degree AV Block — P waves dissociated from QRS complexes, slow ventricular escape rhythm

Complete heart block: Regular P waves (faster rate) with no relationship to wide QRS escape complexes (~55 bpm). Classic AV dissociation.

5. 🫀 Wolff-Parkinson-White (WPW) Syndrome

ECG Changes

The classic WPW triad:

Short PR interval (<120 ms) — bypass tract bypasses AV node delay
Delta wave — slurred, slow upstroke at the start of QRS
Widened QRS (>120 ms) — due to fusion of conducted and pre-excited beats

Additional findings:

Pseudo-infarction Q waves (negative delta waves in inferior leads may mimic inferior MI)
Secondary ST-T changes (discordant to QRS direction)
Risk of AVRT (supraventricular tachycardia) — narrow-complex orthodromic or wide-complex antidromic

Wolff-Parkinson-White ECG — short PR, delta waves, widened QRS, ventricular pre-excitation

WPW: Short PR interval, prominent delta waves (slurred QRS upstroke) in II, III, aVF, and V2–V6 — classic triad of pre-excitation.

6. 🫀 Acute Pericarditis

ECG Changes (four stages):

Stage	Finding
I (days 1–2)	Diffuse concave ("saddle-shaped") ST elevation in most leads; PR depression in II, V4–V6; PR elevation in aVR
II (days 3–7)	ST returns to baseline; T waves flatten
III (weeks 1–3)	Diffuse T-wave inversions
IV (months)	ECG normalises

Key differentiator from STEMI:

ST elevation is diffuse (multiple territories, not one coronary distribution)
ST morphology is concave (smile-shaped), not convex
PR depression is highly specific for pericarditis
No reciprocal ST depression (except in aVR)
Spodick's sign — downsloping TP segment

Acute Pericarditis ECG — diffuse saddle-shaped ST elevation, PR depression across multiple leads

Acute pericarditis: Diffuse concave ST elevation in I, II, III, aVF, V2–V6; PR depression in II; reciprocal ST depression and PR elevation in aVR — classic stage I findings.

7. 🫀 Ventricular Tachycardia (VT)

ECG Changes

Regular wide-complex tachycardia — QRS >120 ms, rate 100–250/min
Monomorphic (uniform QRS) vs Polymorphic (varying QRS — e.g., Torsades de Pointes)
AV dissociation — independent P waves marching through QRS (pathognomonic for VT)
Fusion beats — hybrid QRS from simultaneous sinus + ventricular depolarisation
Capture beats — narrow QRS during VT when sinus impulse conducts normally (confirms VT)
Positive concordance V1–V6 (all positive) or negative concordance (all negative) strongly suggest VT
Northwest axis (QRS negative in both I and aVF)

Ventricular Tachycardia ECG — wide complex tachycardia, monomorphic QRS, no visible P waves, rapid rate

Ventricular Tachycardia — wide QRS complexes, regular rapid rhythm, positive concordance precordial leads

VT with RBBB morphology and left axis deviation — characteristic of idiopathic left ventricular fascicular tachycardia (Belhassen tachycardia).

8. 🫀 Pulmonary Embolism (PE)

ECG Changes

Most common finding is sinus tachycardia. Classic (but low sensitivity ~20%) pattern:

S1Q3T3: Deep S wave in lead I + Q wave in lead III + inverted T wave in lead III
Right axis deviation
Incomplete or complete RBBB (right ventricular strain)
T-wave inversions in V1–V4 (right ventricular strain pattern)
P pulmonale (tall peaked P waves in II — right atrial enlargement)
Atrial fibrillation (acute-onset)
Normal ECG does not rule out PE

Pulmonary Embolism ECG — S1Q3T3 pattern, sinus tachycardia, right heart strain markers

Acute PE: Annotated S1Q3T3 — prominent S wave in lead I, Q wave and inverted T wave in lead III. Sinus tachycardia and right ventricular strain.

PE ECG — S1Q3T3 with T-wave inversions V1-V4, incomplete RBBB, sinus tachycardia

Acute PE: S1Q3T3 + T-wave inversions in inferior leads and V1–V3 + incomplete RBBB (QRS 110 ms) — classic right ventricular strain pattern.

9. 🫀 Hypertrophic Cardiomyopathy (HCM)

ECG Changes

Left ventricular hypertrophy (LVH) voltage criteria: S in V1 + R in V5/V6 ≥35 mm (Sokolow-Lyon); R in aVL ≥12 mm (Cornell)
Deep, narrow ("dagger") Q waves in lateral and inferior leads (I, aVL, V5–V6) — due to septal hypertrophy
Giant negative T-waves in precordial leads (especially apical HCM — Yamaguchi syndrome; V3–V5, depth >10 mm)
Left axis deviation
ST depression with strain pattern (lateral leads)
WPW-like delta waves occasionally seen

Hypertrophic Cardiomyopathy ECG — giant symmetric T-wave inversions, LVH voltage, apical HCM pattern

Apical HCM: Deep symmetric T-wave inversions in V3–V6, II, III, aVF — classic "giant T-wave inversion" pattern of apical (Yamaguchi) HCM.

HCM ECG — high voltage, T-wave inversions, ST strain pattern, septal variant

Septal HCM: High R-wave voltages in V2–V4, ST depression, deep T-wave inversions in V2–V6, positive T in aVR (associated with arrhythmic risk).

10. 🫀 Dilated Cardiomyopathy / Heart Failure

ECG Changes

Left bundle branch block (LBBB): QRS ≥120 ms; broad monophasic R in I, aVL, V5–V6; deep QS in V1–V3; discordant ST-T changes
Poor R-wave progression (V1–V4) — loss of septal forces
Left atrial enlargement: Bifid P wave in II (P mitrale), negative terminal P force in V1
Non-specific ST-T changes (diffuse repolarisation abnormalities)
Sinus tachycardia (compensatory)
Frequent PVCs (ventricular irritability)
Left axis deviation
Low voltage (if associated pericardial effusion or obesity/emphysema)

Dilated Cardiomyopathy / Heart Failure ECG — left bundle branch block, wide QRS, slurred lateral R waves

LBBB in DCM: Wide QRS (>120 ms), broad R waves in I, aVL, V5–V6 with deep QS in V1–V3. Secondary ST-T inversions discordant to QRS — characteristic of dyssynchronous ventricular activation.

Quick Reference Summary

#	Disease	Key ECG Findings
1	STEMI	ST elevation (convex), Q waves, reciprocal ST depression
2	NSTEMI	ST depression, T-wave inversion, no Q waves
3	Atrial Fibrillation	Absent P waves, irregularly irregular RR
4	Complete AV Block	P-QRS dissociation, slow escape rhythm
5	WPW Syndrome	Short PR, delta waves, widened QRS
6	Acute Pericarditis	Diffuse concave ST elevation, PR depression
7	Ventricular Tachycardia	Wide QRS tachycardia, AV dissociation, concordance
8	Pulmonary Embolism	S1Q3T3, sinus tachycardia, RV strain
9	Hypertrophic CM	LVH voltage, deep Q waves, giant T inversions
10	Dilated CM / Heart Failure	LBBB, poor R progression, left atrial enlargement

Clinical Note: ECG findings must always be interpreted in conjunction with clinical history, physical examination, and biomarkers (troponin, BNP). An ECG alone does not confirm or exclude most diagnoses. When in doubt, repeat the ECG and perform echocardiography.

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