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The purpose of this study was to compare a dualfreeze protocol with a triple-freeze protocol for pulmonary cryoablation in a porcine lung model.Five dual-(10-5-10-5) and five triple-freeze (5-5-5-5-10-5) cryoablations were performed on an exposed operation field in normal porcine lung.Changes in the temperature of the cryoprobes and the diameter of the iceballs were measured during the ablation and pathologic changes in the cryozones (zones of tissue destruction)were reviewed 7 days after the procedure.