PLT RPT; B737-400; LOSS OF CABIN PRESSURE; PAX OXYGEN MASKS DROPPED; PAX COULDN'T BREATH. PAX MEDICAL DOCTOR INTERVENTION. EMER CLRNC. DIVERT TO CLT.

Narrative

SHORTLY AFTER LEVELING OFF AT FL370; WE EXPERIENCED A LOSS OF ACFT PRESSURIZATION. I MAINTAINED CTL OF THE ACFT. WE BOTH DONNED OUR OXYGEN MASKS; ESTABLISHED COMS AND COMPLETED OUR QRH (CHKLIST) TASKS. WE IMMEDIATELY ASKED ATC FOR A DSCNT AND STARTED DOWN. AT FIRST IT LOOKED LIKE WE WOULD BE ABLE TO CTL THE CABIN ALT. IT THEN BECAME APPARENT THAT WE COULD NOT CTL THE CABIN; AND WE INCREASED OUR DSCNT. WITH LOSS OF PRESSURIZATION CTL; I DECIDED TO DIVERT TO CLT. AFTER WE ADVISED THE FLT ATTENDANTS THAT THEY COULD COME OFF OF OXYGEN AND ATTEND TO THE PAX; THE LEAD ATTENDANT CAME TO THE COCKPIT TO ADVISE US THAT THEY HAD A PAX WITH A HISTORY OF HEART TROUBLE THAT WAS HAVING DIFFICULT BREATHING. THEY HAD ADMINISTERED OXYGEN AND THERE WAS A DOCTOR ATTENDING TO HIM. I ADVISED HER THAT WE WERE GOING DIRECT TO CLT. THE DOCTOR ASKED FOR THE EMER MEDICAL KIT IN ORDER TO TAKE THE PAX'S BLOOD PRESSURE AND RPTED THAT IT WAS OK AND HE WAS STABLE. WE CALLED AHEAD TO HAVE EMT'S STANDING BY IN CLT. CLT APCH WAS NOTIFIED THAT WE HAD A MEDICAL EMER AND WE WERE VECTORED FOR THE ILS RWY 36L APCH. THE LNDG WAS UNEVENTFUL.