Explain me 10 common ecg of heart diseases with figure

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ECG electrocardiogram heart disease patterns abnormal

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STEMI ST elevation myocardial infarction ECG

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atrial fibrillation ECG tracing irregularly irregular

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ventricular fibrillation VF cardiac arrest ECG

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complete heart block third degree AV block ECG bradycardia

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left bundle branch block LBBB ECG wide QRS

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Wolff-Parkinson-White WPW syndrome delta wave ECG

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ventricular tachycardia VT wide complex tachycardia ECG

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long QT syndrome QTc prolonged ECG torsades de pointes

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right bundle branch block RBBB ECG pattern

I now have excellent images for all 10 ECG patterns. Let me compile the comprehensive educational response.

10 Common ECG Patterns in Heart Disease

1. ST-Elevation Myocardial Infarction (STEMI)

Key ECG Features:

ST-segment elevation ≥ 1 mm in ≥2 contiguous leads (≥2 mm in V1–V3)
Hyperacute (tall, peaked) T-waves in early phase
Pathological Q waves develop within hours (necrosis)
Reciprocal ST depression in mirror leads
"Tombstone" or convex-upward (coved) ST morphology in severe LAD occlusion

Localization by leads:

Territory	Elevated leads	Artery
Anterior	V1–V4	LAD
Inferior	II, III, aVF	RCA
Lateral	I, aVL, V5–V6	LCx

Anterior STEMI — ST elevation V1–V6 with convex "tombstone" morphology and reciprocal changes

2. Atrial Fibrillation (AF)

Key ECG Features:

Absent P waves — replaced by irregular fibrillatory (f) waves, best seen in V1
Irregularly irregular R-R intervals — the hallmark
Narrow QRS unless aberrant conduction present
Ventricular rate varies (60–170 bpm in untreated AF)

Clinical context: Most common sustained arrhythmia. Causes include hypertension, valvular disease, thyrotoxicosis, heart failure, alcohol.

Atrial fibrillation — absent P waves, fine fibrillatory baseline, irregularly irregular rhythm

3. Ventricular Fibrillation (VF)

Key ECG Features:

Chaotic, disorganized waveforms — no identifiable P, QRS, or T waves
Completely irregular amplitude and frequency
Coarse VF: higher amplitude fibrillatory waves (more recent onset, better chance of defibrillation success)
Fine VF: low amplitude, harder to distinguish from asystole

Emergency: Immediately lethal without defibrillation. Shockable rhythm in ACLS.

Ventricular fibrillation — chaotic baseline with no organized complexes

4. Ventricular Tachycardia (VT)

Key ECG Features:

Wide QRS complexes (>120 ms), typically >140–160 ms
Rapid regular rate — typically 100–250 bpm
No preceding P waves (or AV dissociation when visible)
Capture beats and fusion beats are pathognomonic
Positive or negative concordance in precordial leads

Types:

Monomorphic VT: uniform QRS morphology (scar-related in structural heart disease)
Polymorphic VT: varying QRS morphology (ischemia, long QT)

Monomorphic ventricular tachycardia — wide complex regular tachycardia ~150 bpm with no P waves

5. Complete (Third-Degree) AV Block

Key ECG Features:

Complete AV dissociation — P waves and QRS complexes fire independently
P rate > QRS rate (e.g., atrial rate 70–80 bpm; ventricular escape 30–50 bpm)
No fixed PR interval — P waves "march through" QRS complexes
Wide escape QRS if infra-nodal origin; narrow if junctional escape

Clinical significance: Causes syncope, hemodynamic compromise; requires pacemaker.

Third-degree AV block — P waves and wide QRS complexes completely dissociated, ventricular rate ~40 bpm

6. Left Bundle Branch Block (LBBB)

Key ECG Features:

Wide QRS ≥ 120 ms
Broad, notched "M-shaped" R-wave in lateral leads (I, aVL, V5, V6)
Deep broad S-wave (QS pattern) in V1–V3
Absent septal Q waves in lateral leads
Discordant ST-T changes: T waves opposite to QRS vector

Significance: New LBBB in chest pain may indicate acute MI (Sgarbossa criteria apply). Associated with cardiomyopathy, hypertension, aortic stenosis.

Left bundle branch block — wide QRS, M-shaped R in lateral leads, QS in V1–V3

7. Right Bundle Branch Block (RBBB)

Key ECG Features:

Wide QRS ≥ 120 ms
rSR' ("rabbit ears") pattern in V1–V3 — classic sign
Broad, slurred S-waves in lateral leads (I, aVL, V5, V6)
T-wave inversion in V1–V3 (secondary repolarization change)

Significance: Isolated RBBB may be normal variant; new RBBB with anterior MI indicates proximal LAD occlusion (Brugada-type); also seen in pulmonary embolism, congenital heart disease.

Right bundle branch block — rSR' rabbit-ear in V1, slurred S waves in lateral leads

8. Wolff-Parkinson-White (WPW) Syndrome

Key ECG Features:

Short PR interval (< 120 ms) — accessory pathway bypasses AV node
Delta wave — slurred, slow upstroke at start of QRS
Widened QRS (> 110 ms) due to pre-excitation
Secondary ST-T changes discordant to delta wave
Pseudo-infarct Q waves in inferior leads with posteroseptal pathway

Risk: Pre-excited AF can degenerate to VF → sudden cardiac death. Definitive treatment is catheter ablation.

Wolff-Parkinson-White — short PR, delta waves at QRS onset, widened QRS complexes

9. Long QT Syndrome (LQTS)

Key ECG Features:

Prolonged QTc (corrected for heart rate):
- Normal: ≤ 440 ms (men), ≤ 460 ms (women)
- Borderline: 440–470 ms
- Definite: > 500 ms = high risk for Torsades de Pointes
Broad, notched T-waves or T-wave alternans (LQT2)
Deep, notched T-U waves (LQT3)
Can precipitate polymorphic VT (Torsades de Pointes)

Causes: Congenital (KCNQ1, KCNH2, SCN5A mutations), drugs (antiarrhythmics, antibiotics, antipsychotics), electrolyte disturbances (hypokalemia, hypomagnesemia).

Long QT syndrome — prolonged QTc 478 ms (panel a) and Torsades de Pointes degeneration (panel b)

10. Left Ventricular Hypertrophy (LVH) with Strain

Key ECG Features:

High voltage QRS — Sokolow-Lyon criteria: S in V1 + R in V5 or V6 ≥ 35 mm
Left ventricular strain pattern: ST depression + T-wave inversion in lateral leads (I, aVL, V4–V6)
Left axis deviation
Prolonged QRS (but usually < 120 ms)
May show P-mitrale (bifid P in II, notched) if associated left atrial enlargement

Causes: Long-standing hypertension, aortic stenosis, hypertrophic cardiomyopathy.

LVH with strain pattern — high-voltage QRS, T-wave inversions in lateral leads (V4–V6), biatrial enlargement

Quick Reference Summary

#	Pattern	Rate	Rhythm	P wave	QRS	Key Feature
1	STEMI	Normal	Regular	Normal	Normal	ST elevation + Q waves
2	Atrial Fibrillation	Variable	Irregular	Absent	Narrow	f-waves, irregular RR
3	Ventricular Fibrillation	—	Chaotic	Absent	None	Wavy baseline
4	Ventricular Tachycardia	100–250	Regular	Dissociated	Wide	Capture/fusion beats
5	3rd Degree AV Block	Slow	Regular	Regular, dissociated	Wide escape	Complete AV dissociation
6	LBBB	Normal	Regular	Normal	≥120 ms	M-wave lateral, QS V1–V3
7	RBBB	Normal	Regular	Normal	≥120 ms	rSR' V1, S-wave lateral
8	WPW	Normal	Regular	Normal	Widened	Short PR + delta wave
9	Long QT	Normal	Regular	Normal	Normal	QTc > 500 ms
10	LVH/Strain	Normal	Regular	Normal	High voltage	ST depression lateral leads

Images sourced from peer-reviewed clinical ECG datasets (PMC Clinical VQA). All ECGs displayed at standard 25 mm/s paper speed and 10 mm/mV calibration unless noted.

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