Figure 9. Summarized data for the effects of propofol (100 micro Meter) and ketamine (100 micro Meter) on time to peak (Tp) and time to recovery (Tr) for myocyte shortening and intracellular calcium ([Ca2+]i) in response to increasing extracellular calcium ([Ca2+] sub o) concentration. Changes in timing were measured in milliseconds and were normalized to changes in peak amplitude of myocyte shortening and peak [Ca2+]i. Values represent means +/- SEM. *Significant change from control (P < 0.05); n = 21 cells per 6 hearts for control group; n = 20 cells per 5 hearts for other groups.