Nancy Guthrie, pacemaker
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One part of the investigation into the disappearance of "Today" show host Savannah Guthrie's mother focuses on the missing woman's implanted medical device.
Nancy Guthrie’s 2 a.m. pacemaker spike on the day she vanished could mean that the elderly woman was involved in a heart rate-surging struggle with her possible captors, a lead cardiologist speculated Thursday.