| Study | Treatment 1 | Treatment 2 | RR | 95% CI lower limit | 95% CI upper limit |
| Costello 2014 | Milrinone | Placebo | 0.4861 | 0.0950 | 2.4869 |
| Pellicer 2013 | Levosimendan | Milrinone | 0.8261 | 0.0180 | 37.8461 |
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