In science class I learnt about Asphyxia which means 'a condition arising when the body is deprived of oxygen, causing unconsciousness or death; suffocation.'
I wanted to construct a sentence like
The confines of the deep dark chamber was asphyxiatic which drove him into oblivion.
However on searching the net I found no such word as 'asphxyatic', although there is a word called asphyxiation. So is the sentence I constructed incorrect(because it is a medical term) and no such word exists?