What about those of generous size (abscess cavities and patients)? I worry that without an elliptical incision or some packing they will recur (but that might just be from having to take all the failed microstab I+D's the ER doc has done). Sometimes if it is really huge I will make counterincisions and leave a penrose for a week instead of making a gaping hole and when I remove that I never have them pack and the cavity heals just fine. Perhaps I should rethink my strategy. Teach me your butt pus secrets.
I think a 3cm (0r more if necessary) radial incision is adequate for most run-of-the-mill perianal and perirectal abscesses.
For large ones, which are typically horseshoe abscesses, I do use drains and counter-incisions liberally, so I think you're approach doesn't require rethinking. I do a "modified Hanley" with a seton instead of fistulotomy.
Another approach, which I never use but is an option, is to sew a malecot drain into the abscess cavity. I typically only do this if there is a transsphincteric fistula with cephalad extension sinus tract.
What would you say is your threshold for "is Ok for the ER doc to try and see me in clinic" vs "must be approached by a surgeon on the first shot?"
I have the liberty of surgical residents, so I don't have to make this decision very often. If the ER doc can't get it drained, our residents will get it done.
I do think it's acceptable in certain cases to see in the office the following day, but I would be cautious, as anorectal sepsis can come on quickly, and I don't trust the ER doc to be able to discriminate. Still, in private practice you can certainly do this, especially if you have a robust clinic with coverage every day.
I forgot to mention earlier that I will give antibiotics after drainage if there is cellulitis, if the patient is immunocompromised, or if there were severe systemic sx (e.g. rigors). In general, most patients won't need abx after drainage, and it certainly will not impact whether or not they get a fistula.