explain me 10 common heart disease with ECG changes and ECG image of those disease
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ECG changes 10 common heart diseases STEMI atrial fibrillation heart block images
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ECG images STEMI NSTEMI atrial fibrillation heart block ventricular tachycardia Wolff-Parkinson-White site:litfl.com OR site:ecgwaves.com
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ECG images heart diseases STEMI atrial fibrillation heart block ventricular tachycardia
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I have rich ECG images from authoritative textbooks. I now have enough material to write a comprehensive answer. Let me compile everything into a detailed, well-organized response covering 10 common heart diseases with ECG changes and images from the medical library.
10 Common Heart Diseases: ECG Changes and Images
1. ST-Elevation Myocardial Infarction (STEMI)
Pathophysiology: Complete occlusion of a coronary artery causing transmural ischemia.
ECG Changes:
- ST-segment elevation ≥1 mm in ≥2 contiguous limb leads or ≥2 mm in ≥2 contiguous precordial leads (V1-V6)
- Hyperacute T-waves (early sign - tall, peaked)
- Pathological Q-waves (>40 ms wide, >25% of R-wave height) - indicate completed infarction
- ST depression in reciprocal leads
- T-wave inversions (late finding)
Localisation by leads:
- Anterior STEMI: ST elevation in V1-V4 (LAD occlusion)
- Inferior STEMI: ST elevation in II, III, aVF (RCA occlusion)
- Lateral STEMI: ST elevation in I, aVL, V5-V6 (LCx occlusion)
ECG - Inferior-Lateral MI (Left Circumflex Occlusion):
ST-segment elevation in leads II, III, aVF (inferior), and V5-V6 (lateral), with reciprocal ST depression in V1-V3. This patient had 100% occlusion of the left circumflex coronary artery. - Rosen's Emergency Medicine
2. NSTEMI / Unstable Angina (Non-ST Elevation ACS)
Pathophysiology: Partial or intermittent coronary occlusion causing subendocardial ischemia.
ECG Changes:
- ST-segment depression (horizontal or downsloping, ≥0.5 mm in ≥2 contiguous leads)
- T-wave inversions (≥1 mm), particularly in precordial leads
- No ST elevation
- No pathological Q-waves
- ECG may be entirely normal in up to 6% of NSTEMIs
- Dynamic ECG changes (serial ECGs may show evolution)
Key point: Diagnosis requires elevated troponin in the absence of ST elevation. Serial ECG monitoring is vital, as changes diagnostic of STEMI may evolve. - Tintinalli's Emergency Medicine
ECG - aVR elevation suggesting left main/proximal LAD occlusion (NSTEMI pattern):
ST elevation in aVR greater than V1, suggesting left main or proximal LAD occlusion - a high-risk NSTEMI/ACS pattern with diffuse ST depression and aVR elevation. - Tintinalli's Emergency Medicine
3. Atrial Fibrillation (AF)
Pathophysiology: Chaotic, disorganized electrical activity from multiple re-entrant circuits throughout the atria. Rate typically 125-150 bpm when untreated.
ECG Changes:
- Absent P-waves - replaced by fibrillatory (f) waves (irregular, low-amplitude baseline oscillations >300/min)
- Irregularly irregular RR intervals (hallmark sign)
- Normal QRS morphology (unless aberrant conduction)
- Ventricular rate variable, typically 100-160 bpm if untreated
- No organized atrial activity visible
"The irregular pattern... is one of the clinical findings used to diagnose the condition. Therefore, atrial fibrillation is often described as an irregularly, irregular rhythm." - Guyton and Hall Medical Physiology
ECG - Atrial Fibrillation (Lead II):
Lead II showing irregularly irregular QRS complexes with no discernible P-waves. The fibrillatory baseline replaces organized atrial activity. - Guyton and Hall Medical Physiology
4. Atrioventricular (AV) Heart Block
Pathophysiology: Impaired conduction through the AV node or His-Purkinje system.
ECG Changes by Degree:
| Degree | ECG Finding |
|---|---|
| 1st degree | PR interval >200 ms (>5 small squares), all P-waves conduct |
| 2nd degree Mobitz I (Wenckebach) | Progressive PR prolongation until a P-wave is not followed by QRS ("dropped beat"), then cycle repeats |
| 2nd degree Mobitz II | Fixed PR interval with sudden failure of conduction (dropped QRS without warning) |
| 3rd degree (Complete) | Complete AV dissociation - P-waves and QRS complexes are completely independent; atrial rate > ventricular rate |
"Complete heart block (third-degree block) involves complete AV dissociation with a ventricular rate that is slower than the atrial rate." - Harrison's Principles of Internal Medicine 22E
ECG - All Degrees of AV Block (A to E):
(A) First-degree AVB: PR >200 ms, no dropped beats. (B) Mobitz I (Wenckebach): group beating with progressive PR prolongation before dropped beat. (C) Mobitz II: abrupt dropped QRS without prior PR prolongation. (D) 2:1 AVB: alternating conducted/non-conducted P-waves. (E) Complete heart block: completely independent atrial and ventricular rhythms (junctional escape). - Washington Manual of Medical Therapeutics
5. Ventricular Fibrillation (VF)
Pathophysiology: Completely disorganized ventricular electrical activity with no effective contraction - a cardiac arrest rhythm. Most commonly seen with severe ischemic heart disease.
ECG Changes:
- No recognizable P-waves, QRS complexes, or T-waves
- Chaotic, irregular, continuously varying waveforms
- Amplitude can be coarse (easier to defibrillate) or fine (harder to defibrillate)
- No organized rhythm whatsoever
- Incompatible with cardiac output - causes immediate cardiac arrest
ECG - Three Forms of Ventricular Fibrillation:
(A) Fine amplitude VF - almost flat, difficult to distinguish from asystole. (B) Coarse amplitude VF - larger chaotic waves. (C) Coarse VF that can mimic ventricular tachycardia. Treatment: immediate defibrillation + CPR. - Tintinalli's Emergency Medicine
6. Wolff-Parkinson-White (WPW) Syndrome
Pathophysiology: An accessory conduction pathway (Bundle of Kent) bypasses the AV node, creating ventricular pre-excitation. This sets up re-entrant tachyarrhythmias.
ECG Changes (in sinus rhythm):
- Short PR interval (<120 ms) - impulse bypasses the AV node delay
- Delta wave - slurred initial upstroke of QRS (pre-excitation of the ventricle via the accessory pathway)
- Wide QRS complex (>120 ms) due to the delta wave
- Secondary ST-T changes (discordant to QRS)
- During tachycardia: narrow QRS (orthodromic AVRT) or wide QRS (antidromic AVRT, which mimics VT)
"WPW syndrome is a form of ventricular preexcitation involving an accessory conduction pathway that bypasses the AV node and creates a direct electrical connection between the atria and ventricles." - Tintinalli's Emergency Medicine
ECG - WPW Syndrome (12-lead with delta wave):
(A) 12-lead ECG showing classic WPW pattern: short PR interval, delta waves (slurred QRS upstroke), wide QRS complexes, and secondary ST-T changes. (B) Enlarged delta wave morphology. (C) Normal QRS for comparison. (D) Diagram showing the accessory pathway (AP) bypassing the AV node (AVN). - Tintinalli's Emergency Medicine
7. Ventricular Tachycardia (VT)
Pathophysiology: Three or more consecutive ventricular beats at ≥100 bpm, originating below the bundle of His. Most common in patients with ischemic heart disease or cardiomyopathy.
ECG Changes:
- Wide QRS complex (>120 ms) tachycardia at 100-250 bpm
- AV dissociation - P-waves march through independently, unrelated to QRS (pathognomonic when present)
- Fusion beats - hybrid QRS from simultaneous sinus and ventricular activation (pathognomonic)
- Capture beats - rare normal-looking QRS in midst of VT (sinus impulse captures the ventricle)
- Concordance of QRS in all precordial leads (all positive or all negative)
- QRS axis typically abnormal (left axis, or extreme right axis)
- No response to adenosine (distinguishes from SVT with aberrancy)
"For wide-QRS complex tachycardias, the 12-lead ECG is useful in distinguishing a supraventricular tachycardia (with aberrancy) from a ventricular tachycardia. The presence of fusion beats or AV dissociation during a wide-QRS complex tachycardia strongly suggests VT." - Goldman-Cecil Medicine
8. Atrial Flutter
Pathophysiology: A macro-reentrant circuit in the right atrium (typically around the tricuspid annulus) firing at ~300 bpm. The AV node blocks most impulses, typically with 2:1 conduction (ventricular rate ~150 bpm).
ECG Changes:
- "Sawtooth" flutter (F) waves at 250-350/min, best seen in leads II, III, aVF, and V1
- No isoelectric baseline between atrial waves
- Regular or regularly irregular ventricular response
- QRS morphology is normal (unless aberrant conduction)
- Classic 2:1 block = flutter rate 300/min → ventricular rate 150 bpm
- Can have 3:1 or 4:1 block (ventricular rates of 100 or 75 bpm)
Key clinical point: A regular tachycardia at exactly 150 bpm should always raise suspicion for atrial flutter with 2:1 block.
9. Left Ventricular Hypertrophy (LVH)
Pathophysiology: Increased left ventricular muscle mass from chronic pressure overload (hypertension, aortic stenosis) or volume overload. The enlarged LV generates larger electrical signals.
ECG Changes:
- Sokolow-Lyon criteria: S in V1 + R in V5 or V6 > 35 mm
- Cornell criteria: R in aVL + S in V3 > 28 mm (men) or >20 mm (women)
- Tall R-waves in lateral leads (I, aVL, V5-V6) with deep S-waves in right precordial leads (V1-V2)
- "LV strain" pattern: ST depression and T-wave inversion in leads with tall R-waves (I, aVL, V5-V6) - indicates pressure overload
- Left axis deviation
- Widened QRS (can be up to 110 ms)
- Large, broad P-waves or notched P-waves (P mitrale) - if left atrial enlargement co-exists
10. Pericarditis (Acute)
Pathophysiology: Inflammation of the pericardium, causing irritation of the adjacent epicardium, which produces diffuse ST-T wave changes. Unlike MI, the inflammation is diffuse rather than territorial.
ECG Changes (4 classic stages):
| Stage | ECG Finding | Timing |
|---|---|---|
| Stage 1 | Diffuse concave ("saddle-shaped") ST elevation in almost all leads except aVR and V1; PR depression (most specific sign) in II, V5-V6; PR elevation in aVR | Hours to days |
| Stage 2 | ST normalizes, T-waves flatten | Days |
| Stage 3 | Diffuse T-wave inversions | Days to weeks |
| Stage 4 | ECG returns to normal | Weeks |
Key distinctions from STEMI:
- ST elevation is concave (upward dome shape) in pericarditis vs convex (tombstone) in STEMI
- ST elevation is diffuse (all leads) in pericarditis vs regional (territorially localized) in STEMI
- PR depression is characteristic of pericarditis
- No reciprocal ST depression (except aVR) in pericarditis
- No Q-waves in pericarditis
"In pericarditis, the ST segments are concave, with an initial upslope contour... PR segment depression is an insensitive yet specific associated electrocardiographic finding in pericarditis." - Rosen's Emergency Medicine
Quick Reference Summary Table
| # | Condition | Key ECG Finding | Rate | Rhythm |
|---|---|---|---|---|
| 1 | STEMI | Regional ST elevation, Q-waves | Variable | Regular |
| 2 | NSTEMI | ST depression, T inversion, or normal | Variable | Regular |
| 3 | Atrial Fibrillation | No P-waves, irregularly irregular | 100-160 | Irregular |
| 4 | AV Block | Long PR / dropped beats / AV dissociation | Slow | Variable |
| 5 | Ventricular Fibrillation | Chaotic, no QRS/P/T waves | >300 | Chaotic |
| 6 | WPW Syndrome | Delta wave, short PR, wide QRS | Variable | Variable |
| 7 | Ventricular Tachycardia | Wide QRS, AV dissociation | 100-250 | Regular |
| 8 | Atrial Flutter | Sawtooth F-waves, 2:1 block | ~150 | Regular |
| 9 | LVH | High voltage (S-V1 + R-V5 >35 mm), strain | Normal | Regular |
| 10 | Pericarditis | Diffuse concave ST↑, PR depression | Normal | Regular |
Sources: Guyton and Hall Medical Physiology | Harrison's Principles of Internal Medicine 22E | Tintinalli's Emergency Medicine | Rosen's Emergency Medicine | Washington Manual of Medical Therapeutics | Goldman-Cecil Medicine
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