Relation between change in ejection fraction on follow up after aortic valve replacement and contractile reserve at baseline
| ΔEF on F/U | CR+ | CR− |
| Improved | 13 | 3 |
| Worse | 0 | 10 |
| χ2 = 15.2 (p = 0.0001) | ||
CR+, positive contractile reserve; CR−, negative contractile reserve; ΔEF on F/U, change in ejection fraction on follow up.