First day of hyperbaric treatment

Yesterday was the first day my son received hyperbaric treatment (HBT) for cerebral palsy. My son is a 3 1/2 years old, and has been diagnosed with epilepsy and CP. He is a bright and joyous kid that has yet to walk on his own, and has some difficulty with speech. Some things in his life can be probably be attributed to his very low birth weight and prematurity, and the epilepsy drugs, but CP is probably the biggest medical challenge he faces. And faces it, he does. Every day he attacks life like no one I have ever known. His high spasticity is the main thing we would like to see the HBT help.
The chamber we are using is a Vitaeris 320. It is on loan to us from a local community service group and how we got it was nothing short of a miracle. More on that later. The chamber only gets up to 4 psi, about 1.3 ATA, and uses room air to inflate. There is a SeQual Integra oxygen concentrator putting in a few liters a minute into the chamber, but I do not know how much oxygen that works out to be. I will be testing to see how much is in there eventually.
Well my son got in 45 minutes with his mother after we got it yesterday, and he and I got 50 minutes later. The chamber was not very hard to get our son to accept, but it will be a challenge to get all forty dives in.