Posted in Flagyl on November 13, 2015


A 41 year ancient diabetic male presents to your ER steady October 31st with a painful perianal sunken space adjoining the basement.

You walk into the room to determine judicially a clearly uncomfortable man laying bowed on the exam table. He says that he began having dolor 3 days ago and was prescribed “penicillin or something” ~ the agency of his primary doctor, but it hasn’t been helping. He came in today for he felt feverish. He had similar pain in this area years ago and at that time had “something” drained. No sanguinary stools, hematuria or abdominal pain by this episode.

Exam: VS: T: 99.5 HR: 98 BP: 123/87 RR 18 Sat 96% Physical exam reveals each indurated, red and tender indurated mass 4cm from the anal rim. It is draining scant greenish fulvous pus. No surrounding erythema or glow. Digital rectal exam reveals bogginess and “chandelier sign” want of strength internally.

DDx: Perirectal abscess, perianal boil, fistula, hemorrhoid, fissure.

You perform a shallow soft tissue US using the vascular scrutinize and see evidence of deep tracts. CT later confirms fistula making up with tracking into the perirectal distance.

Butt Pus Pearls:

Perianal abscesses are the greatest part common and are visible along the tissues contiguous to the anus.

Perirectal abscesses conjoin the deeper tissues and are higher risk for complications. 

About 50% of anorectal abscesses power of choosing form fistulas over time.

Etiology: 80% cast from infection of the cryptoglandular mass of the perianal region. Less common, but still prevalent causes are Crohn’s (20%), HIV, beamy brightness proctitis, malignancies and TB.

If you be possible to see the abscess externally, you can drain it.

Do a digital rectal exam. Inability to allow the exam or bogginess or induration on exam = advanced imaging such as CT pelvis with IV contrast to mastership out deep tissue abscess/process.

How To Best I & D:

Pinpoint clyster of anesthetic followed by using an 18G finder needle/11 blade scalpel to let draining to begin. After drainage has started, it command be more comfortable for them/easier in spite of you to further anesthetize with a battle-~ block and enlarge the incision.

Use an elliptical or cruciate incision > 1cm to obviate closing an recurrence.

Although the at the head thought is to be as hostile from the sphincter as possible, the closer you incise to the sphincter the more completely (as long as you don’t maltreat the sphincter!). Remember, 50% of these testament go on to become fistulas. The closer the cut to the anus, the shorter the fistula disquisition.


Like other simple abscesses in uncomplicated patients, they don’t distress antibiotics. Consider antibiotics if the invalid has cellulitis, diabetes, immunocompromised or systemic symptoms.

If antibiotics are going to be used, cover gram negatives and anaerobes with Cipro/Flagyl.

Case continued… A small elliptical incision was made after clyster with lidocaine with epinephrine and the sphere was deloculated. Patient was sent home through a course of ciprofloxacin and metronidazole given his recital of DM2 and systemic symptoms. He leave follow up in the next 2 days despite a wound check and evaluation ~ means of the colorectal surgery service. Questions:

1. The good in the highest degree type of incision to drain a perianal imposthume is: a. Single straight b. Elliptical or cruciform incision > 1cm in length c. Single tight with packing material d. Needle yearning e. By crossing the streams 2. True or False: Digital rectal exam is not helpful in differentiating types of anorectal infections. 3. Uncomplicated perianal abscesses end not require antibiotics. Antibiotics should subsist considered in which of the following patients with perianal abscess? a. cellulitis b. diabetes c. immunocompromised d. systemic symptoms e. entirely of the above 4. True or False: 50% of anorectal boil go on to become fistulas too time. 5. The most common motive of anorectal abscesses is: a. Crohn’s b. Infection of the cryptoglandular series c. HIV d. TB e. Proton packs 6. Bonus Question: Which of the following ghosts does NOT appears in the Ghostbusters movies? a. Slimer b. The Scoleri Brothers c. Nearly Headless Nick d. Gozer e. Stay Puft Marshmallow Man

From Emergency Medicine Reviews and Perspectives , September 2015 Podcast “Anorectal Infections”, through Paul Jhun MD and Kyle Cologne MD

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