HKIE Professional Assessment - Biomedical Discipline Practice Questions - HKIE Professional Assessment - Biomedical Discipline (Hong Kong Institution Of Engineers) Exam

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What primary operational objective is served by incorporating a Right Leg Drive (RLD) active feedback circuit into a clinical ECG monitoring system?

To active-drive common-mode displacement currents back into the patient, reducing common-mode noise and maintaining patient ground safety To provide high-voltage isolation (>4 kV) protecting the patient against defibrillator discharge surges To digitize analog biopotential signals directly at the skin surface before differential amplification To compensate for electrode polarization potential by applying a DC offset voltage across Lead II

Correct Answer:

To active-drive common-mode displacement currents back into the patient, reducing common-mode noise and maintaining patient ground safety

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