ECG of normal sinus RYTHHMS -- On an ECG, a normal sinus rhythm is characterized by a heart rate between 60-100 bpm, a regular rhythm, a P wave preceding each QRS complex, and a normal PR interval. •Rhythm: The heart beats regularly, with consistent intervals between each beat. •Heart Rate: The heart rate falls within the normal range of 60 to 100 beats per minute (bpm). •P Wave: A P wave should be present before each QRS complex. The P wave should be upright in leads I and II, and inverted in l

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Differentiating Sinus Tachycardia vs. Atrial Tachycardia: A Quick Guide ⚡️❤️ 🔹 Sinus Tachycardia · Normal P waves (upright in I, II, aVF) · Gradual onset/offset · Rate usually 100–180 bpm · Always 1:1 AV conduction · 🧠 Physiologic response → Treat the underlying cause 🔹 Atrial Tachycardia · Abnormal P-wave morphology (± inverted/notched) · Abrupt onset/offset (may warm-up/cool-down) · Rate typically 130–250 bpm · ❗AV block possible (key clue!) · ⚡ Intrinsic arrhythmia → Treat the rhythm (vaga