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Welsh cup electrodes have __________

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Welsh cup electrodes have __________

(a) low contact impedance

(b) negligible contact impedance

(c) high contact impedance

(d) zero contact impedance

I have been asked this question in unit test.

My enquiry is from Electrodes for ECG topic in portion Bioelectric Signal and Electrodes of Biomedical Instrumentation

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The correct answer is (c) high contact impedance

The explanation: Welsh cup electrodes or suction electrodes is a metallic cup shaped electrode which is used for recording ECG from various positions from the chest. It has a high contact impedance as only the rim of the electrode is in contact with the skin. It is commonly used to record the unipolar chest leads.

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