SAN FRANCISCO (AP) - San Francisco 49ers coach Jim Harbaugh is undergoing a follow-up evaluation with doctors after having a minor procedure last Thursday for an irregular heartbeat.

The 49ers canceled Harbaugh's scheduled media conference call minutes before it was to begin Tuesday afternoon, a day after San Francisco's 32-7 victory over the Chicago Bears, but gave no indication that there is anything of concern with Harbaugh's health in addition to what he went through last week.

Harbaugh, who turns 49 next month, was candid about the ``cardiovert'' - or shocking of the heart to treat an irregular heartbeat - he had done at Stanford Hospital. He has had the condition for most of his life, he said.

Harbaugh was his typical energetic self on the sideline Monday night with the NFC West-leading Niners (7-2-1).