Los Angeles Chargers head coach Jim Harbaugh left the sidelines in the middle of the team’s game on Sunday due to what he said afterward was an “atrial flutter,” in which his heartbeat went out of rhythm.

Los Angeles Chargers head coach Jim Harbaugh briefly left Sunday afternoon’s game against the Denver Broncos because of a flare up with atrial flutter, a type of heart arrhythmia that makes the heart beat irregularly fast.

Los Angeles Chargers head coach Jim Harbaugh explained what plagued him during Sunday's game against the Denver Broncos and caused him to abruptly leave the game.