Summary of respiratory events
| Paper | Regimen | Apnoea | Desaturation | Other |
| Sarici (2001)51 | P 2.5%, C 0.5% (2 d) | 1 | ||
| Degirmencioglu (2014)50 | P 2.5%, T 0.5% (3 d) | 1 | ||
| Wood (2009)49 | P 1%, C 0.2% (1–2 d) | 1 | Shallow breathing (1) | |
| Wood (2009)49 | P 1%, C 0.2% (1–2 d) | 1 | ||
| CARM (2002)35 | P 1%, C 0.5% (1 d) | 1 | 1 | |
| Siu (2011)30 | P 2.5%, C 1% (2 d) | 1 | ||
| Kim (2015)53 | P 2.5%, T 0.5% (2 d) | 1 | Mild wheezing (1) | |
| Kim (2015)53 | P 2.5%, T 0.5% (2 d) | Bronchospasm (1) Mild wheezing (1) | ||
| Ozgun (2014)29 | P 1.25%, C 0.5% (2 d) | Tachyapnoea (1) |
C, cyclopentolate;P, phenylephrine;T, tropicamide;d, standard drops.