Table 2.
Included studies design characteristics
| Author | Publication year | Country | Study design | Data collection | Sampling method | Blind | Follow-up (days) | Jadad score |
|---|---|---|---|---|---|---|---|---|
| Fanning et al.[23] | 1991 | USA | Randomized, placebo-controlled | Prospective | Consecutive | DB | 4 | 4 |
| Colquhoun et al.[24] | 1993 | UK | Randomized, placebo-controlled | Prospective | Consecutive | DB | 4 | 4 |
| Nurozler et al.[26] | 1996 | Turkey | Randomized, placebo-controlled | Prospective | Consecutive | DB | 5 | 3 |
| Treggiari-Venzi et al.[25] | 2000 | Switzerland | Randomized, placebo-controlled | NA | NA | DB | 3 | 5 |
| Hazelrigg et al.[21] | 2004 | USA | Randomized, placebo-controlled | Prospective | NA | DB | 5 | 4 |
| Najafi et al.[11] | 2007 | Iran | Randomized, placebo-controlled | Prospective | Consecutive | DB | Until AF developed and needed therapeutic intervention | 4 |
| Hamid et al.[22] | 2008 | Pakistan | Randomized, placebo-controlled | NA | NA | DB | 1 | 4 |
AF, atrial fibrillation; DB, double-blind; NA, data not available