Multi-center Complex Atrial Tachycardia High-Resolution Mapping Registry (MATH)

An arbitrary sample size of 100 should be enough for this registry study which may cover the focal, macro-reentry, micro-reentry and other types of atrial tachycardia. Assuming that the one-year recurrence rate post complex atrial tachycardia ablation is 30%, the 95% confidence interval of 100 samples shall be 21.2-40.0% (binomial distribution exact method).

As per the current actual situation in China, it is predicted that 70-80 cases may be included for the atrial tachycardia post atrial fibrillation ablation, while 20-30 cases may be included for post cardiac surgery.

Inclusion Criteria:

1. Subject with atrial tachycardia (including atrial flutter) post atrial fibrillation ablation or cardiac surgery, which occurred at least 90 days prior to enrollment;
2. Subject is suitable for Rhythmia system and Orion catheter according to relevant clinical guidelines and products instruction for use, per investigator's discretion
3. Subject is age 18 or above;
4. Subject or his/ her legal representive understands and is willing to provide the Informed Consent Form (ICF) and participate in this trail.

Exclusion Criteria:

1. Subject with atrial fibrillation only;
2. Subject is enrolled in any other concurrent study that might interfere with this study;
3. Women of childbearing potential who are or might be pregnant at the time of this study