Nancy Guthrie, the missing mother of “Today” show host Savannah Guthrie, has high blood pressure and cardiac issues that require a pacemaker, according to a Pima County (Ariz.) Sheriff’s Office audio dispatch reported by People on Tuesday.Sheriff Chris Nanos had previously said Guthrie, 84, required daily medication for undisclosed problems and not taking it could prove fatal. Investigators are desperately searching for Guthrie, who has not been seen since Saturday night.Savannah Guthrie (center), pictured with her mom Nancy (left) and Jenna Bush Hager. Nancy Guthrie has not been seen since Saturday night.NBC via Getty ImagesAuthorities believe she was kidnapped from her Tucson-area home. Reported evidence includes blood found at the scene, indications of forced entry, and her personal effects being left there. A car belonging to Guthrie, who has limited mobility, also remained at the house.After interviewing Guthrie’s other daughter, Annie Guthrie, with whom Nancy Guthrie had dinner on Saturday night, Nanos estimated the time frame for her possible abduction to be between 9:30 p.m. Saturday and 11:30 a.m. Sunday.Nancy Guthrie set off concern when she didn’t attend church services Sunday morning, and the family called law enforcement a short time later.An exterior view of the house of Nancy Guthrie, where authorities believe she was kidnapped.Jan Sonnenmair via Getty ImagesOfficials are investigating a possible ransom note sent to show business outlet TMZ that had a legitimate Bitcoin address.A sign is posted at the house of Nancy Guthrie.Jan Sonnenmair via Getty ImagesClose