Retiring Rep. John Dingell (D-Mich.), the longest-serving member of the House, will undergo a minor heart procedure Thursday to address atrial fibrillation -- a.k.a. an irregular heartbeat -- according to his office.

Here's the office's statement:

"Today, Congressman John D. Dingell will undergo a minimally invasive procedure at Henry Ford Hospital in Detroit. He recently developed atrial fibrillation, and the procedure will seek to find the source of the abnormal heart rhythm and correct it. He is expected to stay in the hospital overnight and be released Friday."

Atrial fibrillation is the most common type of irregular heartbeat. It increases the risk of stroke and can cause heart failure.

Dingell, 87, has already announced he won't seek reelection this year. His wife, Debbie Dingell, is the favorite to succeed him.