How long after catheter ablation can I go up and down stairs?

Could ya before? When discharged, unless your instructions say to avoid stairs, then slow steady pace should not interfere with the access site or its clot/scab. Ideally it will have been at least 3 days, if you are on / back on a blood thinner, may want to give it a week to let the repair process get well underway. Any specific q's should be directed to your electrophysiologist.