Page Contents
OVERVIEW
This page is dedicated to organizing various examples of standardized exam questions whose answer is paroxysmal nocturnal hemoglobinuria (PNH). While this may seem a odd practice, it is useful to see multiple examples of how paroxysmal nocturnal hemoglobinuria (PNH) will be characterized on standardized exams (namely the boards and the shelf exams). This page is not meant to be used as a traditional question bank (as all of the answers will be the same), however seeing the classic “test” characterization for a disease is quite valuable.
KEY CHARACTERISTICS OF THIS CONDITION (ON EXAMS)
When it comes to standardized exams, each condition has its own “code” marked by key buzzwords, lab findings, clues, etc. If you are well versed in this code you will be able to more quickly identify the condition that is being discussed, and get the right answer on the exam you are taking. Below is the “code” for paroxysmal nocturnal hemoglobinuria (PNH).
- Classic triad:
- Hemolytic anemia: hemoglobinuria to be more specific
- Pancytopenia
- Thrombosis: at atypical sites
- CD55 deficiency: flow cytometry may show the absence of certain cell surface markers (such as this one).
QUESTION EXAMPLES
Question # 1
Explanation # 1
Question # 2
Explanation # 2
TESTABLE FACTS ABOUT THIS CONDITION (BEYOND ITS IDENTIFICATION)
Many questions on standardized exams go beyond simply recognizing the underlying condition. Often there are specific testable facts regarding some aspect of the disease’s pathophysiology/management/clinical implications that are commonly asked. Some of these are listed below:
- What is it? Complement mediated hemolysis
- Treatment: Eculizumab (complement protein C5)
- Complications: iron deposition in the kidney (hemosiderosis)
Page Updated: 04.09.2017