Mikey Gets Cut by Occam's Razor
At the visit, the patient notes that her throat is still sore, and that her tongue is still mildly swollen. Physical exam is notable for mild glossitis and swelling of the right submandibular gland. There is no pharygneal erythema or swelling.
Breakdown of her medical history reveals that she has developed allergies to sulfa drugs and several anti-hypertensive medications, including generic lisinopril, which elicits cough from the patient. She is allergic to walnuts, and one of her brothers is allergic to Brazil nuts.
I do a Medline search looking at side effects of lisinopril, and it returns several articles associating angioedema with long-term use of ACE inhibitors. Proud of my evidence-based knowledge, I present my case to my preceptor, who listens with indifference or boredom, I can't tell which.
What caused the acute angioedema? Was it:
a) Zestril
b) the generic acetaminophen
c) some other medication out of her husband's pillbox
d) The Mystery Pastry
My preceptor decided that the most likely culprit was the Mystery Pastry. The patient has been taking Zestril for 5 years without incident. An anaphylactic reaction to the inert components of the acetaminophen pill is highly unlikely. We refer her to an allergist to screen for food allergies, and restart her Zestril because her blood pressure is elevated. There were no medications in her husband's pillbox that were associated with any of her allergies.
And just in case, we also write a prescription for an Epipen.
Moral of the story: The sexiest explanation (Zestril-induced angioedema) isn't necessarily the correct one. Occam's Razor - the simplest explanation is the most likely.
Right now I'm listening to: This Beautiful Life, Big Bad Voodoo Daddy