600 / | HD | SURGERY |
300 | DF | DIAGNOSTIC TESTING {38} |
481 | DF | .~ Cardiovascular {6} |
508 | DF | .~.~ Heart {4} |
509 | DF | .~.~.~ Detecting heartbeat electric signal {10} |
522 | .~.~.~.~ Switching means for activating different monitoring systems, signal displays, or signal recorders |