The definitive interactive ECG tool — from waveform anatomy to STEMI recognition, arrhythmia identification, and clinical pattern recognition. Master the systematic approach that cardiologists use, with interactive diagrams, a complete rhythm library, and the critical patterns you cannot afford to miss.
Covers 9 comprehensive sections: waveform anatomy, systematic interpretation, rate calculation, rhythm library, axis determination, STEMI territories with equivalents (De Winter, Wellens, posterior MI), bundle branch blocks with Sgarbossa criteria, electrolyte changes, and clinical ECG patterns (PE, pericarditis, Brugada, WPW).
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The systematic approach trusted by cardiologists, emergency physicians, and intensivists
Nine comprehensive sections covering every aspect of ECG interpretation — from basic waveform anatomy to advanced clinical pattern recognition.
Comprehensive interactive ECG interpretation tool covering waveform anatomy, systematic 5-step approach (Rate, Rhythm, Axis, Intervals, ST/T), rhythm library, STEMI territories with equivalents, bundle branch blocks with Sgarbossa criteria, electrolyte ECG changes, and clinical patterns (PE, pericarditis, Brugada, WPW, digoxin).
Each section is interactive with expandable cards, clinical pearls, and mnemonics
Interactive SVG diagram with labeled P wave, QRS complex, ST segment, T wave, PR interval, and QT interval — click each component to learn its clinical significance and normal values.
Rate → Rhythm → Axis → Intervals → ST/T waves. The structured interpretation method used by cardiologists — with the 300 method, 6-second method, axis quadrant determination, and interval normals.
Interactive rate calculator with the 300 method for regular rhythms and 6-second method for irregular rhythms. Includes clinical classification: bradycardia, normal, and tachycardia ranges.
Complete rhythm reference — Sinus rhythms, SVT, Atrial Fibrillation/Flutter, Junctional rhythms, Ventricular Tachycardia, V-Fib, 1st/2nd/3rd degree AV blocks, and paced rhythms with key features and clinical significance.
Visual axis quadrant tool using Lead I and aVF. Normal axis, LAD, RAD, and extreme axis deviation — with clinical causes for each deviation (LAFB, RVH, PE, LVH).
Coronary artery territory mapping — anterior (LAD), inferior (RCA), lateral (LCx), and posterior STEMI patterns. Includes STEMI equivalents: De Winter, Wellens, posterior MI, and right ventricular MI.
RBBB vs LBBB recognition with 'WiLLiaM MaRRoW' mnemonic, clinical significance, and Sgarbossa criteria for diagnosing STEMI in the presence of LBBB — the critical skill that saves lives.
ECG manifestations of hyperkalemia (peaked T → sine wave), hypokalemia (U waves, ST depression), hypercalcemia (short QT), and hypocalcemia (long QT) — with progression stages and emergency thresholds.
Pattern recognition for PE (S1Q3T3, right heart strain), pericarditis (diffuse ST elevation, PR depression), Brugada syndrome, WPW (delta waves), digoxin effect ('Salvador Dalí mustache'), and hypothermia (Osborn waves).
Life-threatening ECG findings that demand immediate recognition and action
Anterior, inferior, lateral, and posterior STEMI patterns. Plus the critical equivalents: De Winter (LAD occlusion), Wellens (critical LAD stenosis), and posterior MI (V1-V3 depression).
Diagnose STEMI in the presence of LBBB — the scoring system (concordant STE ≥1mm, concordant STD V1-V3, excessive discordant STE) that changes management.
Peaked T waves → PR prolongation → P wave loss → QRS widening → sine wave → asystole. Know each stage and when to give calcium, insulin/glucose, and dialysis.
Irregularly irregular rhythm, absent P waves, fibrillatory baseline. Rate control vs rhythm control, CHA₂DS₂-VASc scoring, and anticoagulation decisions.
Wide complex tachycardia — monomorphic vs polymorphic (Torsades). AV dissociation, capture beats, fusion beats. When to cardiovert vs defibrillate.
Right heart strain pattern — S wave in I, Q wave and inverted T in III. Plus sinus tachycardia, right axis deviation, and RBBB in acute PE.
Essential for anyone who reads ECGs — from students learning the basics to attending physicians refining their pattern recognition.
Master the systematic approach to ECG interpretation — from rate calculation to STEMI recognition. Essential for every admission, every code, every morning report.
Rapid STEMI identification, arrhythmia recognition, and electrolyte emergency patterns — the ECG skills that matter most when minutes count in the ED.
Build your ECG foundation from anatomy to clinical patterns. Interactive format makes learning stick — perfect for Step 2, shelf exams, and clinical rotations.
Confident rhythm identification, STEMI recognition, and critical ECG changes — the knowledge that enables faster escalation and better patient outcomes.
Expand beyond ECG interpretation with our full Cardiovascular bundle. Covers heart failure management, arrhythmia protocols, hemodynamic monitoring, and ACS pathways — everything you need for comprehensive cardiac care.
View Cardiovascular BundleAccess all 1,268+ medical tools across 50+ specialties — including this ECG interpretation master and all future releases. One purchase, lifetime access.
Get ECG Interpretation Master — waveform anatomy, systematic approach, rhythm library, STEMI territories, bundle branch blocks, electrolyte changes, and clinical patterns.