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Figure 4


Fig. 4. The duration of the QRS interval (A), ST interval (B), PR interval (C) and QT interval related to heart rate (RR) of the ECG waveform for sham-operated rattlesnakes (Crotalus durissus; white bars) and snakes with occluded coronary circulation (black bars) after 1 day and 4 days. Values are means ± s.e.m. Control snakes (N=4); snakes with coronary occlusion (N=6). *Significant difference from rest; {dagger}significant difference from sham-operated snakes.