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Figure 4 Temperature and individual (4-mm electrode) lesion types. The figure shows the distribution of the average maximum temperatures for type 0–5 individual lesions. Eleven linear lesions were created in eight dogs using a catheter with a thermistor on each individual electrode. Seven linear lesions were created with the 70°C power protocol, and four were generated with the 70% local electrogram recording reduction protocol. Type 3 lesions, which were created with an average temperature of 71 ± 7°C, exhibited no charring or impedance rises. Contiguous and transmural lesions were not formed at lower temperatures (types 0–2). Desiccation (type 4) and charring (type 5) occurred at higher temperatures.
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