Figure 2: Muscle twitch response (mN) in an in-vitro contracture test with 0.1, 0.2, 0.4, 0.6, and 1.0 mM dibucaine in skeletal muscle specimens of malignant hyperthermia- susceptible (MHS; n=8) and normal (MHN; n=8) swine. The value “0” refers to the last twitch before the application of 0.1 mM dibucaine. Dots and squares, respectively, indicate means; error bars illustrate standard deviation. Intergroup difference: *P < 0.05.