B737-700 CREW DEPARTED WITHOUT A PROPER DEFERRAL FROM THE DISPATCHER AT BOS.

Narrative

THE ACFT ARRIVED ABOUT 25 MINS LATE WITH A MEDICAL EMER ON BOARD. WHEN WE BOARDED THE ACFT; WE DISCOVERED THAT 1 THERAPEUTIC OXYGEN BOTTLE; 1 MEDICAL OXYGEN BOTTLE; AND THE MEDICAL KIT HAD BEEN USED. THESE DISCREPANCIES WERE ENTERED IN THE MAINT LOG AND MAINT CTL CONTACTED. WE WERE ABLE TO GET MEL'S FOR THE THERAPEUTIC OXYGEN AND THE MEDICAL KIT AND ABLE TO DEFER THE MEDICAL OXYGEN. FLT CREW MEL PROCS WERE FOLLOWED AND THE LOGBOOK PAPERWORK COMPLETED. BY THIS TIME; BOARDING WAS ALMOST COMPLETED AND WE GOT CLRNC AND COMPLETED THE BEFORE START CHKLIST WITH THE IDEA THAT WE WOULD CONTACT SEA DISPATCH BEFORE PUSHBACK TO AMEND OUR RELEASE TO REFLECT THE ADDED MEL'S. WELL; AS IS PROBABLY OBVIOUS; WE GOT BUSY AND FORGOT TO CONTACT DISPATCH; WHO APPARENTLY WAS ALSO DISTR WITH THE BAD WX UP AND DOWN THE EAST COAST. BOTTOM LINE IS; WE TOOK OFF WITHOUT AMENDING OUR RELEASE. JUST TOO MUCH GOING ON IN A COMPRESSED AMOUNT OF TIME. SUPPLEMENTAL INFO FROM ACN 584960: I THOUGHT DISPATCH HAD AMENDED OUR RELEASE TO SHOW THE MEL'S. I STARTED TO COPY THE MEL INFO ONTO THE PAPERWORK; BUT GOT DISTR BY BOARDING AND TRYING TO GET OUT ON TIME. I THOUGHT I'D HAD AN AMENDED RELEASE WHEN THE CAPT WAS TALKING TO MAINT CTL; AND I COPIED MOST OF THE INFO AT THAT TIME.