Normal ECG Waveform Diagram | Medical Reference & Educational Resource #1206570 (License: Personal Use)

This black-and-white line illustration depicts a standard lead II electrocardiogram showing two regular cardiac cycles. Each cycle includes a small upward P wave (atrial depolarization), a sharp tall QRS complex (ventricular depolarization), and a rounded T wave (ventricular repolarization), all on a flat baseline. The consistent rhythm and morphology indicate normal sinus rhythm without arrhythmia or ischemic changes.

Used in medical textbooks, online health portals, clinical training modules, and patient-facing educational content to explain how the heart’s electrical activity appears on an ECG. Matches user intent for learning, teaching, or verifying normal cardiac physiology.