Every ECG electrode starts with a substrate, and for the vast majority of disposable electrodes used in hospitals, cardiac monitoring, and ambulatory diagnostics, that substrate is a thin, flexible foam. It rarely gets attention in product marketing, yet it is the layer that determines whether an electrode stays put through a stress test, feels comfortable on fragile skin for multi-day Holter monitoring, and holds its shape when a nurse peels it off packaging under time pressure.
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