Lurker,
Taken from The Aviation Herald of 30 December 2009:
A Swiss Airbus A340-300, registration HB-JMN performing flight LX-93 from Sao Paulo Guarulhos,SP (Brazil) to Zurich (Switzerland), was enroute about 80 minutes into the flight, when a female passenger (25) on board suffered symptoms similiar to a heart attack prompting the flight crew to divert to Recife,PE (Brazil). A doctor on board provided first aid suspecting a pulmonary embolism and was able to stabilize the passenger. The crew advised medical services while on approach, that the woman didn't feel her lower limbs. The airplane landed safely in Recife about 3 hours after departure, the passenger was taken to a local hospital.
The airplane reached Zurich with a delay of 3.5 hours.
What a remarkably similar incident to the one experienced by your colleagues. Imagine, even the departing and divert airports were the same. What a coincidence! And how fortunate Swiss seems to attract a higher calibre of medical professional than BA.
Perhaps you can add some links to reputable media sources to verify your story?
Express,
FYI as you replied to Lurker on this.