When Pete is taking Mirandas blood pressure he holds the bell of the stethoscope against her arm with his thumb. This is incorrect for the same reason you don't use your thumb to check someone's pulse. The thumb actually contains a heartbeat too. If you use it to try to listen, as with the stethoscope when taking a blood pressure, or check someones pulse your likely to pick up the sound/beat of your own pulse. If you use your thumb to check your own blood pressure or pulse you will get an incorrect reading, because you'll be hearing/feeling your own heartbeat twice.

Film

Gothika (2003)

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