Doppler ultrasound detectors search for errant microbubbles.If they do appear, the specialist who controls the machine, called the perfusionist, can adjust the flow of blood through the gas exchanger.

• 以都卜勒超音波侦测器寻找游荡的微小泡泡，一发现微泡的踪迹，操作机器的专家（称为体外循环技师）就可以对于通过气体交换装置的血流量做些调整。