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I want to practice ecg can u provide me some real case scenario

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real ECG cases with images for clinical practice junior doctor arrhythmia MI block

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https://ecg.utah.edu/lesson/9

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free ECG cases images LITFL life in the fast lane clinical cases with answers

I have everything I need. Here are 5 real-world ECG cases for you to practice, mixing common patterns you'll encounter as a junior doctor. Each one gives you the clinical history and ECG image first - try to interpret it before reading the answer below.

ECG Practice Cases - Junior Doctor Level

How to approach each ECG systematically: Rate → Rhythm → Axis → P waves → PR interval → QRS → ST/T waves → Overall diagnosis

🫀 Case 1 - Middle-aged man, chest pain + diaphoresis

Clinical history: Middle-aged man, sudden onset crushing chest pain + sweating. BP dropped to 80/50 mmHg.
View the ECG here:
Think before scrolling - What is your diagnosis?
Answer: Anterolateral STEMI (LAD occlusion) with cardiogenic shock
  • Massive ST elevation in I, aVL, V1-V6
  • Reciprocal ST depression in II, III, aVF
  • Hypotension indicates cardiogenic shock - this is a time-critical cath lab activation
Pearls:
  • Anterior STEMIs carry the highest mortality due to large LV territory involved
  • STE in aVR + multilead STD = consider left main occlusion
  • LITFL ECG Case 001 has the full breakdown

🫀 Case 2 - 57-year-old man, 2 weeks of axillary pain

Clinical history: 57-year-old man referred by GP after 2 weeks of episodic left axillary pain. HR 73, BP 134/64, SpO2 97%. Currently pain-free at triage.
View the ECG:
Think - What subtle finding must you not miss?
Answer: Wellens' Syndrome (Type A - biphasic T waves in V2-V3)
  • Deeply biphasic or inverted T waves in V1-V3 in a pain-free patient = critical LAD stenosis
  • These changes persist when pain-free - that's the diagnostic clue
  • Do NOT stress test this patient - it can precipitate MI
  • Requires urgent cardiology review and likely PCI
Pearls:
  • Wellens' is a pre-infarction syndrome - the vessel is about to fully occlude
  • LITFL Case 132 shows this beautifully

🫀 Case 3 - 45-year-old man, chest pain + indigestion

Clinical history: 45-year-old male, presenting with chest pain he describes as "indigestion." He almost didn't come in.
ECG findings to interpret (text description):
  • Rate: 72 bpm, regular rhythm
  • Deep Q waves in leads II, III, aVF
  • ST elevation in II, III, aVF (2-3mm, convex upward)
  • Reciprocal ST depression in I, aVL, V1-V2
  • Tall R wave developing in V1
What artery? What territory? Any extension?
Answer: Inferior STEMI + Posterior extension (RCA occlusion)
  • Inferior STEMI: STE in II, III, aVF with reciprocal changes in I, aVL
  • Posterior extension: Tall R wave + ST depression in V1-V2 (mirror image of posterior STE)
  • The RCA also supplies the SA and AV nodes - watch for bradycardia and heart blocks
  • Get right-sided leads (V3R-V4R): STE in V4R confirms RV involvement → avoid nitrates (will crash BP)
Pearls:
  • "Indigestion" is a classic MI masquerade - always get an ECG
  • Inferior MI + 3rd degree AV block = complete heart block from nodal artery infarction
  • Source: Tintinalli's Emergency Medicine & VDH ECG Case Studies

🫀 Case 4 - 26-year-old woman, ESRD and weakness

Clinical history: 26-year-old female with end-stage renal disease on dialysis. Presenting with generalized weakness. K+ = 8.4 mEq/L.
ECG findings to interpret (text description):
  • Rate: 58 bpm, regular
  • Peaked, tall, narrow, symmetric T waves in precordial leads (V2-V5)
  • PR prolongation (1st degree AV block)
  • Widened QRS (120ms)
  • ST elevation in some leads
What is happening and what is the immediate treatment?
Answer: Severe Hyperkalemia (8.4 mEq/L) - Life-threatening
  • Classic progression: Peaked T waves → PR prolongation → QRS widening → sine-wave pattern → VF
  • Immediate treatment (remember C-BIG-K-DROP):
    • C - Calcium gluconate IV (membrane stabilization - give FIRST, within minutes)
    • B - Bicarbonate (shift K+ intracellularly)
    • I - Insulin + Glucose (drives K+ into cells)
    • G - (already covered above)
    • K-DROP - Kayexalate, Dialysis, Remove the cause
  • This patient needs urgent dialysis
  • Source: VDH ECG Case Studies (ESRD case)

🫀 Case 5 - 70-year-old man, palpitations + irregular pulse

Clinical history: 70-year-old man with hypertension and 2-day history of palpitations. Irregular pulse on exam. No chest pain. BP 145/90.
ECG findings to interpret (text description):
  • Rate: ~110 bpm, irregularly irregular
  • No discernible P waves (replaced by fibrillatory baseline, most obvious in V1)
  • Variable R-R intervals
  • Narrow QRS complexes
  • No ST changes
Diagnosis? What are your two immediate priorities?
Answer: Atrial Fibrillation with rapid ventricular response
  • Irregularly irregular + absent P waves + narrow QRS = AF until proven otherwise
Two immediate priorities:
  1. Rate control (HR > 100 with symptoms) - metoprolol or diltiazem IV/oral
  2. Anticoagulation decision - calculate CHA₂DS₂-VASc score
    • This patient: Hypertension (1) + Age 70 (1) = score 2 → anticoagulate (DOAC preferred)
    • If > 48 hrs or unknown onset → do NOT cardiovert without TOE/anticoagulation for 3 weeks first
Pearls:
  • AF + WPW (irregular + wide QRS + delta waves) = never give AV nodal blockers - can cause VF
  • New AF < 48 hours can be cardioverted after therapeutic anticoagulation
  • Always look for triggers: thyroid, PE, sepsis, ACS

Your ECG Practice Library

For more image-based cases with answers, these are the best free resources:
Want me to continue with more cases? I can give you a focused batch on:
  • Arrhythmias (SVT vs VT differentiation, heart blocks)
  • Conduction defects (LBBB, RBBB, WPW)
  • Life-threatening patterns (torsades, hyperK, PE - S1Q3T3)
  • Or increase the difficulty level
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