I had an instructor that asked the class what does an ECG measure? - TopicsExpress

I had an instructor that asked the class what does an ECG measure? Electricity only or does it measure muscle contraction as well? Everyone said electricity only because of the rhythms we are familiar with such as pulseless vtach and PEA. He stated we were wrong and it does measure muscle contraction. Thinking about this I wonder how a cell can depolarize without causing some sort of muscle contraction. Whats your thoughts?

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