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Alternative Names Return to topPNH
Definition Return to top
Paroxysmal nocturnal hemoglobinuria is a rare disease in which red blood cells break down earlier than normal.
Causes Return to top
Persons with this disease have blood cells that are missing a gene called PIG-A. This gene allows a substance called glycosyl-phosphatidylinositol (GPI) to help certain proteins stick to cells.
Without PIG-A, important proteins cannot connect to the cell surface and protect the cell from destructive substances in the blood. As a result, blood cells break down too early. The cells leak hemoglobin into the blood, which can pass into the urine. This can happen at any time, but is more likely to occur during the night or early morning.
The disease can affect people of any age. It may lead to aplastic anemia , myelodysplastic syndrome, or acute myelogenous leukemia.
Risk factors, except for prior aplastic anemia, are not known.
Symptoms Return to top
Exams and Tests Return to top
Red and white blood cell counts and platelet counts may be low.
Red or brown urine signals the breakdown of red blood cells and that hemoglobin is being released into the body's circulation and eventually into the urine.
Tests that may be done to diagnose this condition may include:
Treatment Return to top
Steroids or other drugs that suppress the immune system may help slow the break down of red blood cells. Blood transfusions may be needed. Supplemental iron and folic acid are provided. Blood thinners may also be needed to prevent clot formation.
Soliris (eculizumab) is a drug used to treat PNH. It blocks the breakdown of red blood cells.
Bone marrow transplantation can cure this disease.
All patients with PNH should receive vaccinations against certain types of bacteria to prevent infection. Ask your doctor which ones are right for you.
Outlook (Prognosis) Return to top
The outcome varies. Most people survive greater than 10 years after their diagnosis. Death can result from complications such as blood clot formation (thrombosis) or bleeding.
In rare cases, the abnormal cells may decrease over time.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call your health care provider if you find blood in your urine, if symptoms worsen or do not improve with treatment or if new symptoms develop.
Prevention Return to top
There is no known way to prevent this disorder.
References Return to top
US Food and Drug Administration. FDA Approves First-of-its-Kind Drug to Treat Rare Blood Disorder. Rockville, MD: National Press Office; March 16, 2007. Release P07-47.
Schwartz RS. Autoimmune and intravascular hemolytic anemias. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 164.Update Date: 11/10/2008 Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.