Fig. 1. Halothane-induced, dose-dependent increase of [Ca2+]iin cultured skeletal muscle cells from six malignant hyperthermia–susceptible (MHS) individuals (n = 42; solid dots and line) and four control individuals (n = 32; open dots and dotted line). Discrimination between MHS and control is 100% beyond 0.5 mm halothane (P < 0.05). (Inset ) [Ca2+]iresponse at clinically used halothane concentrations (< 1.0 mm).