Explain me 10 common heart diseases with Ecg changes and Ecg images

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10 common heart diseases ECG changes with ECG images explained

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ECG changes atrial fibrillation heart block LBBB RBBB hypertrophy pericarditis images site:litfl.com OR site:ecgwaves.com

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ECG images STEMI atrial fibrillation complete heart block ventricular tachycardia WPW syndrome site:litfl.com

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ECG examples images STEMI inferior anterior pericarditis LVH WPW complete heart block ventricular tachycardia ecgwaves.com OR ecglibrary.com

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I now have rich textbook content. Let me provide the comprehensive answer with all the ECG information gathered, including working textbook images and inline ECG image links from authoritative sources:

10 Common Heart Diseases: ECG Changes & Images

Here is a thorough, textbook-based guide to the 10 most clinically important heart diseases and their ECG findings.

1. ST-Elevation Myocardial Infarction (STEMI)

Pathophysiology: Complete occlusion of a coronary artery causes transmural ischemia. Acute ischemia shifts the ST vector toward the epicardium of the affected zone, producing ST elevations.

ECG Changes:

Hyperacute T waves - earliest sign (tall, peaked, broad T waves)
ST elevation (>1 mm in limb leads, >2 mm in precordial leads) in the territory of the affected artery
Reciprocal ST depression in opposite leads
Pathological Q waves develop within hours to days (>40 ms wide, >25% of R-wave amplitude)
T-wave inversions follow the ST elevation phase
Loss of R-wave amplitude over time

Lead Localization:

Territory	Leads with ST Elevation	Artery
Anterior	V1-V4	LAD
Inferior	II, III, aVF	RCA
Lateral	I, aVL, V5-V6	LCx
Posterior	Reciprocal changes V1-V3 (tall R, ST depression)	RCA/LCx

Textbook ECG diagram (ischemia current of injury):

ST elevation vs ST depression current of injury diagram

Fig: Subendocardial ischemia causes ST depression (overlying leads); transmural/epicardial ischemia causes ST elevation. - Harrison's Principles of Internal Medicine 22E

Wellens T-wave sign (severe LAD stenosis):

Wellens T-wave - severe anterior ischemia with deep precordial T-wave inversions

Fig: Deep T-wave inversions in V1-V4 (Wellens sign) indicating high-grade LAD stenosis - Harrison's 22E

ECG image: Inferior STEMI example - LITFL

2. Atrial Fibrillation (AF)

Pathophysiology: Chaotic, disorganized atrial electrical activity from multiple re-entrant wavelets replaces coordinated P waves with fibrillatory activity.

ECG Changes:

No distinct P waves - replaced by irregular fibrillatory baseline (f-waves), best seen in V1
Irregularly irregular RR intervals (hallmark finding)
Narrow QRS complexes (unless aberrant conduction or BBB)
Ventricular rate varies (usually 110-160 bpm if uncontrolled)
Coarse AF: prominent fibrillatory waves (>1 mm); Fine AF: barely visible baseline undulation

ECG image reference: Atrial Fibrillation - LITFL ECG Library

3. Complete (Third-Degree) AV Heart Block

Pathophysiology: Complete failure of conduction between atria and ventricles. The atria and ventricles beat independently.

ECG Changes:

P waves present at regular atrial rate (~60-100 bpm), but with no relationship to QRS complexes
QRS complexes are regular but at a slow escape rate
- Junctional escape: narrow QRS at 40-60 bpm
- Ventricular escape: wide QRS at 20-40 bpm
AV dissociation - P waves "march through" QRS without any consistent relationship
Prolonged QRS if ventricular escape rhythm

ECG image reference: Complete Heart Block - LITFL ECG Library

4. Left Bundle Branch Block (LBBB)

Pathophysiology: Failure of conduction in the left bundle causes delayed, abnormal left ventricular depolarization. The septum depolarizes right-to-left (reversed) and the LV wall is activated late via cell-to-cell conduction.

ECG Changes:

Wide QRS ≥120 ms
Broad, notched ("M-shaped") R wave in lateral leads (I, aVL, V5, V6) - "William" pattern
Deep broad S wave in V1 (QS or rS pattern)
No septal Q waves in I, V5, V6 (absent normal septal q)
Discordant ST-T changes: ST depression and T-wave inversion in leads with tall R waves (I, aVL, V5, V6)
Causes diagnostic difficulty: LBBB masks STEMI changes; use Sgarbossa criteria to detect STEMI in LBBB

Mnemonic: WiLLiaM (W in V1, M in V6 = LBBB)

ECG image reference: LBBB - LITFL ECG Library

5. Right Bundle Branch Block (RBBB)

Pathophysiology: Impaired conduction in the right bundle causes delayed RV depolarization, producing a terminal rightward deflection on the ECG.

ECG Changes:

Wide QRS ≥120 ms
RSR' ("rabbit ears") pattern in V1 - broad terminal R' wave
Wide, slurred S wave in I, aVL, V5, V6 (delayed RV activation)
T-wave inversion in V1-V3 (secondary repolarization change, normal in RBBB)
ST depression in V1-V3 is normal (secondary change)

Mnemonic: MaRRoW (M in V1, W in V6 = RBBB)

ECG image reference: RBBB - LITFL ECG Library

6. Left Ventricular Hypertrophy (LVH)

Pathophysiology: Increased LV muscle mass (from chronic pressure overload, e.g., hypertension, aortic stenosis) amplifies the normal left-directed QRS vectors.

ECG Changes:

Increased QRS voltage (main criterion):
- SV1 + RV5 or RV6 >35 mm (Sokolow-Lyon)
- RaVL >20 mm (women) or >28 mm (men)
- Cornell voltage: SV3 + RaVL >28 mm (men), >20 mm (women)
Left axis deviation
"LV strain" pattern: ST depression + T-wave inversion in lateral leads (I, aVL, V5, V6)
Left atrial enlargement (broad notched P wave in II / biphasic P in V1)
Wide QRS as hypertrophy progresses toward LBBB

ECG image reference: LVH - LITFL ECG Library

7. Pericarditis

Pathophysiology: Inflammation of the pericardium causes diffuse epicardial irritation, resulting in diffuse ST elevation (no reciprocal changes, unlike STEMI) and PR depression.

ECG Changes (evolve through 4 stages):

Stage 1 (acute): Diffuse concave ("saddle-shaped") ST elevation in most leads except aVR and V1; PR segment depression (pathognomonic) in most leads; PR elevation in aVR
Stage 2: ST returns to baseline; T waves flatten
Stage 3: T-wave inversions develop (global)
Stage 4: ECG normalizes (weeks to months)

Key differentiator from STEMI:

Pericarditis: ST elevation is concave (smiley face), diffuse, no reciprocal ST depression (except aVR), PR depression present
STEMI: ST elevation is convex (tombstone/frowny), regional, with reciprocal changes

ECG image reference: Pericarditis - LITFL ECG Library

8. Wolff-Parkinson-White (WPW) Syndrome

Pathophysiology: An accessory pathway (Bundle of Kent) bypasses the AV node, pre-exciting part of the ventricle early. This creates the characteristic delta wave.

ECG Changes (in sinus rhythm):

Short PR interval (<120 ms) - AV node delay bypassed
Delta wave - slurred upstroke at the beginning of a wide QRS (pre-excited portion)
Wide QRS (>120 ms total) - fusion of pre-excited and normally conducted impulses
Discordant ST-T changes (secondary to abnormal depolarization)
Type A WPW: positive delta wave in V1 (left-sided pathway)
Type B WPW: negative delta wave in V1 (right-sided pathway)

During AF in WPW: Extremely dangerous - very rapid, irregular wide-complex tachycardia ("irregularly irregular wide complex") - do NOT give AV nodal blocking drugs

ECG image reference: WPW Delta Wave - LITFL ECG Library

9. Ventricular Tachycardia (VT)

Pathophysiology: Rapid, repetitive firing from a ventricular focus, bypassing normal conduction system, causing broad, abnormal QRS complexes.

ECG Changes:

Wide QRS complexes ≥120 ms, rate >100 bpm (usually 140-200 bpm)
Regular (usually) rhythm
AV dissociation - P waves independent from QRS (pathognomonic when seen)
Fusion beats - narrow QRS from normal conduction fuses with wide VT beat
Capture beats - occasional narrow QRS when sinus impulse captures ventricle (confirms VT)
Concordance - all precordial QRS complexes pointing the same direction (positive or negative)
Negative concordance (all QRS negative in V1-V6): strongly suggests VT

VT vs SVT with aberrancy: Brugada criteria / Josephson sign / RS interval in precordials help distinguish

ECG image reference: Ventricular Tachycardia - LITFL ECG Library

10. Hypertrophic Cardiomyopathy (HCM)

Pathophysiology: Asymmetric septal hypertrophy causes abnormal myocardial disarray, impaired filling, possible LV outflow obstruction, and arrhythmia risk.

ECG Changes (variable, nonspecific but often dramatic):

LVH voltage criteria (tall R in lateral leads, deep S in right precordials)
Deep, narrow Q waves in lateral (I, aVL, V5, V6) and inferior leads (II, III, aVF) - "dagger Q waves" from abnormal septal depolarization (hallmark)
T-wave inversions particularly in lateral leads
Left axis deviation
Giant negative T waves in V3-V5 (in apical HCM / Yamaguchi syndrome) - may be enormous (>10 mm)
Atrial fibrillation (common complication - loss of atrial kick poorly tolerated)
Pre-excitation patterns possible
Frequent PVCs, nonsustained VT on Holter monitoring

ECG image reference: Hypertrophic Cardiomyopathy - LITFL ECG Library

Quick Reference Summary Table

#	Disease	Rate	Rhythm	P Wave	PR	QRS	ST-T
1	STEMI	Variable	Regular	Normal	Normal	Normal (early) → Q waves	ST elevation → T inversion
2	Atrial Fibrillation	110-160 (uncontrolled)	Irregularly irregular	Absent (f-waves)	None	Narrow	Variable
3	Complete AV Block	Atria 60-100, Ventricle 20-60	Regular (AV dissociation)	Normal, no QRS relation	None	Wide escape	Normal
4	LBBB	Normal	Regular	Normal	Normal	≥120 ms, M in V6	Discordant depression
5	RBBB	Normal	Regular	Normal	Normal	≥120 ms, RSR' in V1	Discordant V1-V3
6	LVH	Normal	Regular	LAE (broad P)	Normal	Tall voltage	Lateral strain
7	Pericarditis	Sinus tachy	Regular	Normal	PR depression	Normal	Diffuse concave STE
8	WPW	Normal/tachy	Regular	Normal	<120 ms short	Wide + delta wave	Discordant
9	VT	140-200	Regular	AV dissociation	N/A	Wide ≥120 ms	Discordant
10	HCM	Normal	Regular/AF	Normal or LAE	Normal	LVH voltage	Deep "dagger" Q waves, T inversions

ECG Image Gallery Links (LITFL - Open Access)

For each condition, high-quality ECG tracings are available at these authoritative resources:

Atrial Fibrillation ECGs - multiple examples including coarse/fine AF
Inferior STEMI - classic leads II, III, aVF elevation
Anterior STEMI - V1-V4 elevation
Complete Heart Block - AV dissociation
LBBB - William pattern
RBBB - Marrow pattern
LVH - voltage + strain
Pericarditis - saddle-shaped STE + PR depression
WPW/Delta Wave - short PR + delta
Ventricular Tachycardia - wide complex tachycardia
HCM - dagger Q waves

Sources: Harrison's Principles of Internal Medicine 22E (2025); Braunwald's Heart Disease, 10th Ed; Goldman-Cecil Medicine; Tintinalli's Emergency Medicine; LITFL ECG Library (Open Access)

Note: ECG interpretation should always be correlated with clinical history, physical examination, and other investigations. This summary is for educational purposes.

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