Table 1. The baseline characteristics of included studies.
| Author | Year | Data Source | Mean Age (year) | Male Gender (%) | No. Of Patients | Ablation Type | No. Of AF | Follow-Up duriation (month) | Primary Outcomes | Quality Score | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cryo | RF | Total | Cryo | RF | Cryo | RF | ||||||||
| Bastani et al.23 | 2013 | Sweden | 65.0 | 85.0 | 78 | 75 | 153 | 8-mm-tip −80 °C | 3.5-mm-irrig-tip 30–40 W,40–42 °C | 43 | 35 | 6 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; 5. Pain perception | 4 |
| Kuniss et al.20 | 2009 | Germany | 65.5 | 80.7 | 90 | 91 | 181 | 8-mm-tip NA | 8-mm-tip 50–80 W,55–60 °C | 23 | 28 | 3 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; 5. Pain perception | 3 |
| Malmborg et al.25 | 2009 | Sweden | 58.7 | 87.5 | 20 | 20 | 40 | 8-mm-tip NA | 8-mm-tip 65 W,60 °C | 11 | 8 | 15.1 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; 5. Pain perception | 3 |
| Thornton et al.27 | 2008 | Netherlands | 56.0 | 88.7 | 32 | 30 | 62 | 8-mm-tip −75 °C | 8-mm-tip 60 W,60 °C | 25 | 22 | 3 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; | 3 |
| Wang fang et al.24 | 2007 | China | 59.6 | 94.4 | 9 | 9 | 18 | 6-mm-tip NA | 4-mm-irrig-tip 30 W,55 °C | 2 | 3 | 22 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; | 3 |
| Collins et al.28 | 2006 | Australia | 64.9 | 71.4 | 13 | 15 | 28 | 8-mm-tip −75 to −80 °C | 8-mm-tip 50–80 W,60 °C | 1 | 4 | 14.7 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; 5. Pain perception | 4 |
| Timmermans et al.11 | 2003 | Netherlands | 55.0 | 78.6 | 7 | 7 | 14 | 6-mm-tip NA | 8-mm-tip 55 W,70 °C | NA | NA | 6 | 1. Acute success; 2. Recurrence; 3. Procedure time; 4. Fluoroscopy time; 5. Pain perception | 3 |
Cryo: cryoablation; RF: radiofrequency ablation; irrig: using irrigated tip; W: watt; AF: atrial fibrillation; NA: not available