Los Angeles Chargers head coach Jim Harbaugh said on Monday that he will wear a heart monitor for the next two weeks after leaving his team’s game on Sunday with an “atrial flutter.”

The cardiologist confirmed the condition is an “atrial flutter,” Harbaugh said. An atrial flutter is a heart rhythm disorder that can cause the organ’s upper chambers to beat too quickly. Harbaugh said Sunday night after the game that he believed the situation was an atrial flutter “episode.