ECG Lead II — FRCA Primary MCQ

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EasyPhysics & Clinical MeasurementECG Lead IIFRCA Primary

Lead II of the ECG records the potential difference between:

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Correct answer: A — Right arm and left leg

Lead II: right arm (-) to left leg (+). It provides the best P-wave visibility and is commonly used for rhythm monitoring. Lead I: RA to LA. Lead III: LA to LL. Einthoven's law: Lead II = Lead I + Lead III.

Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment