Figure 83-7 Action density during separation from cardiopulmonary bypass (CPB) without and with complications. The graph on the left is the density diagram of an uncomplicated case (Case B) with a "flat" action density diagram during (between the two vertical lines) and after separation from CPB. In contrast, Case C, shown in the graph on the right, had a complicated weaning from CPB: A very high action density is followed by an elevated density with further peaks after separation.