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Measurement of Atrial Fibrillation Cycle Length. A circular mapping catheter and the ablation catheter are placed in the right and left atrial appendages respectively. Using automated software with manual correction where necessary the AFCL is measured synchronosly using unambiguous recordings. The mean AFCL is determined from 30 seconds of continuous recording and in this example the cycle length of the right atrium is 151ms and in the left is 161ms.
