Figure 4.

Response of the diastolic (upper), systolic (middle), and developed (lower) tensile force of the unloading (left) and auxotonic (right) type (1) during inflation of the balloon in the aortic root, the addition of (2) 15 μg/min dobutamine (Dobu), (3) 200 μg thiopental, and (4) 1.5 (0.7) l of saline given intravenously within 15 minutes, and (5) fast withdrawal of the first 2 l of blood from the left atrium. Notice the significant changes in the averaged systolic auxotonic signal during inotropic interventions and the almost missing changes in the systolic auxotonic signal on withdrawal of volume. The differences in both signals are most significant in developed force. *p < 0.05; **p < 0.01.