Iowa State coach Fred Hoiberg, who had career-ending, open-heart surgery in 2005, is in the Mayo Clinic for surgery to replace his pacemaker, he confirmed via text to ESPN.com.
A month after finishing up his first season with the Minnesota Timberwolves, Hoiberg learned he had an aortic root aneurysm. During surgery, a rare complication required that doctors insert a pacemaker.
That pacemaker, Hoiberg said via text, started to act up over the weekend.
"My pacemaker wasn't elevating my heart rate at all and felt very off," Hoiberg texted. "Worked out with my wife this morning and my heart rate wouldn't elevate over 65."
Hoiberg, who retired immediately after the 2005 surgery and has taken special care since, immediately contacted his doctor.
"They found my pacemaker was on reserve and was conserving battery," Hoiberg continued in the text message. "Getting it replaced early [Tuesday] morning and all should be well."
USA Today first reported the news. Hoiberg told the newspaper that the procedure was relatively routine -- "Basically, they're just replacing my batteries."
Hoiberg, 41, has led a hoops rejuvenation at his alma mater. The Cyclones reached the Sweet 16 this season and have earned three consecutive NCAA tournament berths since Hoiberg took over in 2010.
Already on the short list for many NBA openings, Hoiberg signed a 10-year contract extension in 2013.