We had departed London and just passed 30 degrees west longitude, slightly less than halfway across the ocean. The flight attendant chime sounded in the cockpit accompanied by the engine instrument and crew alerting system message "cabin call." I put the interphone handset to my ear. "Les, it's Liz. We have a woman in coach that we believe is having a heart attack." Liz was the purser, the lead flight attendant.
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