The electrocardiograph is an instrument which is used in the examination of people suffering from heart disease. It indicates how serious is their illness and maintains a check on recovery subsequent to a heart attack. In essence, it detects the amount of electricity which paaes through the heart muscle as it pumps blood through the body.
Einthoven's successful invention stemmed from the discovery by two German scientists in the mid -19th century, that a frog's heart creates an electric current.
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