I don't think a medical event accounts for the loss of altitude, and also potentially overriding the door lock control.
"..... and activated the button that commands the loss of altitude," the prosecutor, Brice Robin, said.
He said it appeared that the intention of the co-pilot, identified as Andreas Lubitz, had been "to destroy the aircraft." He said that the voice recorder showed that the co-pilot had been breathing until before the moment of impact, suggesting that he was conscious and deliberate in killing 144 passengers and five other crew members in the French Alps on Tuesday.
The inquiry had shown that the crash was intentional, Mr. Robin said, and he was considering changing his investigation from involuntary manslaughter to voluntary manslaughter."
Prosecutor: Co-pilot, alone at helm of Germanwings, began descent manually, 'intentionally'