A B737-700 CAPT; DURING A MEDICAL EMER DURING A FLT FROM ANC TO ORD; SUSPECTED THAT THE CABIN CREW WERE UTILIZING THE WRONG OXYGEN BOTTLE AND HIS BEST ATTEMPTS AT MAKING SURE THE FLT ATTENDANTS COMPLIED WENT UNHEEDED.

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JUST PAST COHILL ON NCA11; 'A' FLT ATTENDANT CALLED AND ADVISED THAT A PAX WAS 'UNRESPONSIVE AND NOT BREATHING.' MEDLINK COMS WERE ESTABLISHED; BUT ONLY WITH FLT ATTENDANT #2 RELAYING FOR US. I ASKED THE FLT ATTENDANTS TO CONFIRM THAT THEY WERE USING THERAPEUTIC OXYGEN; AS IT WAS DISCUSSED IN MY RECURRENT TRAINING THAT PROPER OXYGEN USE HAD BEEN A PROB. EACH TIME THAT THIS CAME UP IN OUR CONVERSATION; I ASKED FOR VERIFICATION; AS I BECAME UNEASY ABOUT WHICH BOTTLE THEY WERE IN FACT USING; BASED UPON SOME OF THE VERBIAGE THAT THEY USED. 2 NURSES WERE ON BOARD AND THEY ASSISTED THE FLT ATTENDANTS IN STABILIZING THE PAX; WHOSE CONDITION RAPIDLY IMPROVED. FLT ATTENDANT #2 RELAYED TO US THAT; BASED UPON THE INFO THAT WE PROVIDED ABOUT THE PAX'S CONDITION; THE MEDLINK DOCTOR ADVISED CONTINUING TO ORD; KEEPING THE PAX ON OXYGEN. THE 'A' FLT ATTENDANT CALLED AND ASKED TO BE LET INTO THE FLT DECK. HE CAME IN HOLDING AN ALMOST DEPLETED DECOMPRESSION/FIRST AID BOTTLE AND ADVISED US THAT THEY HAD USED THE WRONG BOTTLE. WE REQUESTED AND DSNDED TO FL250. THE THERAPEUTIC BOTTLE WAS IN USE WITH THE PAX; SO THAT COULD NOT BE SUBSTITUTED FOR THE DECOMPRESSION/FIRST AID BOTTLE. THE TIME THAT WE WERE ABOVE FL250 WITHOUT THE REQUIRED BOTTLE WAS KEPT TO A MINIMUM; BECAUSE WE DSNDED PROMPTLY. THERE SEEMS TO BE A LOT OF CONFUSION WITH THE FLT ATTENDANTS ABOUT THE PROPER BOTTLE TO USE.