Couple of comments. 24 weeks is "viability," where 50% of all born neonates survive to one year of age.
But it is not until 26-27 weeks where 50% of the survivors survive without "major" chronic physical or mental problems.
So it is a very good bet that at 22 weeks, there will be some major serious, lifelong damage. That is why many neonatal untis now are not as agreessive about employing all possible meassures before viability.
Go read up on the "duke miracle babies." duke medical school pushed survival up at the extreme preemie end, but after a couple of years, when it was clear that the outcomes where not all that happy, they quietly went back to the standard "comfort care" before viability. Nearly all of these "miracle babies" today live in institutions and group homes, with a few being cared for at home. To mu knowledge, not even one of them ever have been able to function even moderately independent.