Figure 3: Changes in morphology of T wave recorded in CV5RL precordial lead, after treatment of dogs with cisapride. To be compared with normal T wave monophasic. (A) Mild notching 1 h after treatment with 1.5 mg/kg: (grade 2); (B) Marked notching with flattening of the T wave 1 h after treatment with 6 mg/kg (grade 4); (C) Severe notching of the T wave, 3 h after treatment with 6 mg/kg (grade 5).