Figure 2 :Raw electrocardiogram (ECG) tracings from two test animals. The thin line shows two ECG complexes recorded before the administration of the aqueous extract of Cleistanthus collinus. The thick lines represent ECG tracings just prior to death after the administration of the aqueous extract of C. collinus. The time interval of both the traces is matched and the first R-wave is superimposed. The upper panel shows no observable change in the ECG pattern before and after C. collinus extract (A). The lower panel taken from a different animal shows PR prolongation and increase in T-wave duration (B).