ON ARR PAX NOT BREATHING; DECLARED A MEDICAL EMER.

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FLYING AS CAPT ON XXXX AT APPROX XA42L. WHILE ON A VISUAL TO RWY 17L AT DFW (3000 FT MSL FROM THE W). WE WERE INFORMED OF A PAX MEDICAL EMER. POSSIBLE HEART ATTACK; AND THAT MEDICAL ASSISTANCE WOULD BE REQUIRED. WHILE THE FO COORDINATED WITH THE FA AND THE REGULAR CABIN ATTENDANT WHO WAS DH. I INFORMED DFW TWR (126.55) OF THE EMER; AND WAS IMMEDIATELY CLRED FOR LNDG ON RWY 17R; AND CLRED TO TAXI TO THE GATE. WE TOUCHED DOWN AT XA45L AND ARRIVED AT THE GATE AT XA49L. A PARAMEDIC WAS WAITING AT THE GATE AND 2 MORE ARRIVED SHORTLY THEREAFTER. LATER I LEARNED THAT THE PAX HAD BEEN IN FACT CHOKED ON SOMETHING AND WAS NOT BREATHING. THE IMMEDIATE RESPONSE BY THE CABIN CREW. WITH THE ASSISTANCE OF DEADHEADING CREW -- NON REVENUE PAX UNDOUBTEDLY SAVED MS X'S LIFE. THE IMMEDIATE RESPONSE BY DFW TWR CTLRS -- RAMP CTLRS -- AND PARAMEDICS WAS INVALUABLE AND IS GREATLY APPRECIATED. I WILL FOLLOW THIS '0F25' WITH A LETTER TO THE FLT OFFICE WITH A LIST OF PERSONNEL ONBOARD THE FLT. THIS WAS AN EXAMPLE OF TEAM WORK AT ITS BEST! THANKS TO EVERYONE INVOLVED.