Paroxysmal Cold Hemoglobinuria
- Author: Corinne Goldberg, MD; Chief Editor: Emmanuel C Besa, MD more...
Background
Paroxysmal cold hemoglobinuria (PCH) has the distinction of being the first, albeit rarest, type of autoimmune hemolytic anemia (AIHA) to be identified. This condition was first described in 1854 as an abrupt onset of systemic symptoms including severe anemia and hemoglobinuria upon exposure to cold temperatures, occurring as a manifestation of massive intravascular hemolysis.
The pathophysiology of paroxysmal cold hemoglobinuria became apparent when Julius Donath and Karl Landsteiner discovered a unique "biphasic hemolysin" in blood that could be demonstrated in the laboratory. This antibody attaches to red blood cells (RBCs) in the cold and induces hemolysis when the RBCs are warmed due to complement activity. Together these investigators devised and published in 1904 what was to be the first immunohematologic test, referred to as the Donath-Landsteiner test.[1, 2, 3, 4] (See Lab Studies.)
In the latter half of the 19th century, the most common cause of paroxysmal cold hemoglobinuria was congenital or adult tertiary-stage syphilis. The ability to treat syphilis through antibiotic use resulted in the near elimination of this secondary cause to the chronic paroxysmal cold hemoglobinuria form. Currently, this condition commonly manifests as an abrupt onset and transitory process related to infections, usually representing a postviral episode. A study of children found that as many as 40% of immune hemolytic anemias were due to the Donath-Landsteiner (D-L) antibody.[5, 6]
Although most cases of paroxysmal cold hemoglobinuria occur as an acute event in children younger than 5 years, recurrent episodes have been reported.[6, 7, 8, 9, 10] Furthermore, because the D-L antibody does not necessarily occur with a specified cold exposure event, nor is it recurrent in nature, an alternative classification of Donath-Landsteiner hemolytic anemia was proposed.[11]
In the adult population, infections and neoplasms have been associated with the development of D-L antibody.[12] Reported neoplasms include solid organ carcinomas as seen with pulmonary small cell carcinoma and hematopoietic disorders such as non-Hodgkin lymphoma (NHL), chronic lymphocytic lymphoma (CLL), primary myelofibrosis with myeloid metaplasia, and in the presence of a monoclonal protein with Bence Jones proteinuria.[6, 11, 13, 14, 15, 16] With an underlying disease that is controllable or self-limited, the process may resolve spontaneously and quickly. Unfortunately, due to the transitory nature of paroxysmal cold hemoglobinuria, lack of awareness may lead to a failure in recognizing and diagnosing this uncommon syndrome.
For excellent patient education resources, visit eMedicine's Blood and Lymphatic System Center. Also, see eMedicine's patient education article Anemia.
Pathophysiology
Although paroxysmal cold hemoglobinuria shares similar antibody thermal activity range as cold hemagglutinin disease (CHD), the more common cold variant of autoimmune hemolytic anemia, the D-L antibody is not classified as a monophasic immunoglobulin M (IgM), but rather a biphasic, usually polyclonal, IgG. The D-L antibody is known to bind to various antigens such as I-, i-, p-, Pr-, on the RBC surface; yet, the glycosphingolipid P antigen is considered its primary target.[6]
This interaction sensitizes the erythrocytes to allow further interaction with the complement system. However, unlike cold hemagglutinin disease in which the IgM-complement interaction results in the cells' removal (via extravascular phagocytosis), paroxysmal cold hemoglobinuria occurs upon completion of complement lysis within the vascular circulation. Intravascular hemolysis occurs preferentially at 37°C, at which temperature the antibody has dissociated yet maintains maximal complement activity, providing the biphasic nature of the disease.
The exact etiology of the D-L antibody is unknown. There is a close relationship observed upon exposure to viral or bacterial agents and the development of paroxysmal cold hemoglobinuria within 2-3 weeks of upper respiratory or gastrointestinal symptoms. Young children are the most susceptible within the general population, developing a single, brief, postviral hemolytic episode.[2, 17]
The stimulus for production of this antibody is likely a form of molecular mimicry in which a microorganism's antigen shares structural similarity to the P antigen on human RBCs, resulting in immunogenic cross-reactivity.[3] Interestingly, the P antigen has been found on lymphocytes and skin fibroblasts; the latter is thought to be the reason for the development of urticaria in persons with paroxysmal cold hemoglobinuria.
Because complement-mediated injury to the RBC is an intravascular process, hemoglobinemia, hemoglobinuria, and, sometimes, renal failure may develop.[10, 18, 19, 20, 21, 22] Even after the acute event remits, the D-L antibody may persist for 1-8 months to several years.[23]
Epidemiology
Frequency
United States
Paroxysmal cold hemoglobinuria is a rare disorder, with a prevalence rate that remains largely unknown within the United States population.
International
Sokol et al estimated the annual incidence of paroxysmal cold hemoglobinuria at 0.4 cases per 100,000 people.[7, 8] Unfortunately, due to the scarcity of subjects, European epidemiologic results have varied widely from as low as 1.6% to as high as 40% of autoimmune hemolytic anemia cases, with the latter value restricted to children.[6, 10, 23]
Mortality/Morbidity
- When paroxysmal cold hemoglobinuria is promptly diagnosed and appropriately treated with supportive care, most patients recover spontaneously within days to a few weeks. Thus, the prognosis for this disorder is excellent.
- Fatality is a rare event, more commonly attributed to severe anemia.
Race
No racial predisposition is recognized for paroxysmal cold hemoglobinuria.
Sex
There is a mild male sex predilection with paroxysmal cold hemoglobinuria; the male-to-female ratio is approximately 2:1 to 5:1.[10, 19]
Age
- Acute paroxysmal cold hemoglobinuria is a disease that affects mostly young children, commonly following an acute viral or upper respiratory illness.
- Chronic paroxysmal cold hemoglobinuria is commonly seen in the elderly. Contributory secondary causes are generally neoplastic in origin, followed by infections.
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