Figure 3. Effects of propofol on developed tension in papillary muscle isolated from the rat heart. Preparations (n = 4) were bathed in an oxygenated Krebs-Henseleit solution at 37 degrees Celsius and paced electrically at 1 Hz. The anesthetic was added to the bathing solution cumulatively. Vertical bars represent SEM. Values on the ordinate are presented as a percentage of the developed tension recorded immediately before adding propofol (0.64 +/- 0.15 g).