False. This describes Sinus Bradycardia, not Normal Sinus Rhythm. Sinus Bradycardia has the same features as NSR but with a rate below 60 bpm.

Sinus Tachycardia has the same morphology as Normal Sinus Rhythm (one P wave per QRS, narrow QRS) but the rate exceeds 100 bpm.

SVT is a narrow-complex tachycardia with rates typically 150–250 bpm. P waves are usually buried in the preceding T wave and are not visible.

False. Atrial Fibrillation is irregularly irregular but has NO distinct P waves. The baseline shows chaotic fibrillatory waves instead of organized P waves.

Atrial Flutter is characterized by its distinctive sawtooth pattern (flutter waves) at an atrial rate of 250–350 bpm, often conducted to the ventricles in a regular ratio (e.g., 2:1, 3:1).

Ventricular Tachycardia originates below the bundle of His in the ventricles, producing wide QRS complexes (>0.12 sec) at a rapid rate, typically >150 bpm.

True. Ventricular Fibrillation is a chaotic, disorganized rhythm with no identifiable QRS complexes. It produces no cardiac output and is a shockable rhythm requiring immediate defibrillation.

First-Degree AV Block has a prolonged but consistent PR interval (>0.20 sec). Every P wave is followed by a QRS — no dropped beats occur.

True. A 12-lead ECG is the gold standard prehospital tool for identifying ST-elevation myocardial infarction (STEMI) and guiding early treatment and hospital notification.