Table 1: Studies comparing dilatation methods for efficiency.
| Study | Intervention | Success |
| Frattini, et al. [18] | One-step vs. Alken | No statistically significant difference |
| Amjadi, et al. [19] | One-step vs. Alken | No statistically significant difference |
| Falahatkar, et al. [20] | One-step vs. Alken | No statistically significant difference |
| Aminsharif, et al. [21] | One-step vs. Alken | No statistically significant difference |
| Ozok, et al. [10] | Alken vs. Amplatz | No statistically significant difference |
| Hijazi, et al. [9] | Alken vs. Amplatz | Amplatz more successful (statistically significant) |
| Nalbant, et al. [3] | Amplatz vs. Alken vs. Balloon | No statistically significant difference |