AN A320 CREW; DURING PUSHBACK AND ENG START; INSTEAD OF OPERATING THE ENG MODE SELECTOR; OPERATED THE PARKING BRAKE SELECTOR; BRINGING THE ACFT TO A SUDDEN STOP. INJURY TO A FLT ATTENDANT AND DAMAGE TO THE TOWBAR WAS THE RESULT.

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DURING PUSHBACK; WE WERE CLRED TO START ENGS. IN ORDER TO INITIATE ENG START; THE ENG MODE SELECTOR MUST BE TURNED TO THE R. INSTEAD OF TURNING THE MODE SELECTOR TO THE R; I ACCIDENTALLY TURNED THE PARKING BRAKE SWITCH TO THE R; BRINGING THE ACFT TO A SUDDEN STOP. ALTHOUGH THE SWITCHES HAVE DIFFERENT SHAPES; THEY ARE LOCATED IN THE SAME GENERAL AREA OF THE CTL PANEL AND BOTH TURN TO THE R TO ACCURATE. THE SUDDEN STOP BROKE THE TOWBAR AND A FLT ATTENDANT WAS INJURED REQUIRING A TRIP TO THE EMER ROOM. SHE WAS TREATED AND RELEASED. THERE WAS NO DAMAGE TO THE ACFT; AND NO ONE WAS INJURED ON THE GND. THE EVENT HAPPENED DURING THE 11TH HR OF A 12 HR DUTY DAY. THE DAY CONSISTED OF 4 1-HR LEGS WITH A 1 1/2 - 2 HR SIT TIME BTWN EACH LEG. SHOWN TIME WAS XA50 WITH MOUNTAIN TIME WITH RELEASE AT XA00 PACIFIC TIME. I FEEL THAT FATIGUE WAS A FACTOR. I BELIEVE THAT SITTING AROUND WAITING FOR THE NEXT DEP IS JUST AS TIRING AS BEING IN THE AIR THE WHOLE TIME. THE LONGER THE WAIT ON THE GND; THE LONGER IT TAKES TO GET INTO THE FLYING FRAME OF MIND. EVERY TIME WE GOT INTO THE COCKPIT TO FLY ANOTHER LEG WAS LIKE STARTING A WHOLE NEW DAY. I AM BEING MORE CAREFUL ABOUT WHICH SWITCH I AM PUTTING MY HAND ON NOW. ESPECIALLY WHEN IT'S LATE IN THE DAY.