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    So, we attached 3 ECG leads to an individual in order to look at their heart traces. We then attached a microphone (of sorts) to their chest in order to detect heart sounds. We have been asked whether the relationship between the ECG and heart sounds, and the blood volume signal detected by the plethysmograph would change, depending whether it was applied to the finger or ear? This is a stupidly worded question, I know.

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