A detailed medical infographic titled "ECG Findings at a Glance" on a dark navy background. The infographic is organized into clear sections with color-coded panels: TOP SECTION - "ECG Basics" panel in teal: - ECG paper grid: small boxes = 1mm = 0.04s, large boxes = 5mm = 0.2s - Rate formula: 300 ÷ number of large boxes between R waves - Normal HR: 60–100 bpm MIDDLE LEFT - "ECG Waves & Intervals" panel in dark blue with labeled waveform diagram: - P wave: atrial depolarization, normal <0.12s, <0.25mV - PR interval: 0.12–0.20s (3–5 small boxes) - QRS complex: ventricular depolarization, normal <0.12s - ST segment: isoelectric (between depolarization & repolarization) - T wave: ventricular repolarization, upright in most leads - QT interval: <0.44s (men), <0.46s (women) MIDDLE CENTER - "Axis" panel in purple: - Normal axis: -30° to +90° - Left axis deviation: more negative than -30° - Right axis deviation: more positive than +90° - Extreme: -90° to ±180° MIDDLE RIGHT - "Key Abnormal Findings" panel in red/orange: • ST Elevation → STEMI, pericarditis • ST Depression → NSTEMI, ischemia, digoxin effect • Prolonged PR → 1st degree AV block • Wide QRS → Bundle branch block, hyperkalemia • Prolonged QT → Torsades risk, drugs, electrolytes • Delta wave + short PR → WPW syndrome • Tall peaked T waves → Hyperkalemia • Deep Q waves → Old MI BOTTOM LEFT - "Rhythm Assessment" panel in green: Steps: 1) Rate 2) Rhythm regular? 3) P before every QRS? 4) PR interval normal? 5) QRS narrow or wide? 6) Axis BOTTOM CENTER - "Normal Sinus Rhythm Criteria" panel in teal: - Rate 60–100 bpm - Regular R-R intervals - Upright P in leads I, II, aVF - P before every QRS - PR 0.12–0.20s - QRS <0.12s BOTTOM RIGHT - "Bundle Branch Blocks" panel in orange: RBBB: RSR' in V1 ("M" pattern), wide S in I/V6 LBBB: broad notched R in I/V6, QS in V1 Both: QRS ≥0.12s The infographic uses clean medical icons, white text labels, and a professional clinical design with small ECG trace illustrations decorating each section. Footer: "Source: Medical Physiology & Fuster's The Heart"