The event is: the heart-lung machine used for cardiac bypass during open heart surgery was unintentionally shut off when the perfusionist operating the machine bumped the on/off power switch.The perfusionist immediately recognized that the pump was off and reset the switch back to on position.Although there was power to the machine, there was no forward flow of blood through the system.Additionally, the pump was unable to be manually operated to maintain effective forward flow.Circulation had to be maintained by open heart cardiac compressions for approximately twelve minutes until the back-up machine could be connected.
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