PNH Morbidity and Mortality
Chronic hemolysis is central to the morbidities and mortality of PNH1-6
Hemolysis is chronic in PNH, and is central to its characteristic signs and symptoms, illustrated in the diagram below.1,2,5,6,8-10
click to enlarge
Thrombosis
- Is the leading cause of death in PNH, occurring in approximately 40% of patients2
- An estimated 50% of all PNH deaths may be attributed to thrombosis2
- Thrombosis has been reported to increase the risk of death 10-fold in patients with PNH11
Anemia
- Presents in a majority of PNH patients and is caused by chronic hemolysis and/or bone marrow failure1,8
- Patients may become transfusion-dependent to maintain adequate levels of hemoglobin4,10
Smooth muscle dystonias1,9
- Include dysphagia, abdominal pain, erectile dysfunction in men and pulmonary and systemic hypertension
- Are hypothesized to be related to nitric oxide depletion during chronic hemolysis
Impaired quality of life
- Quality of life is frequently impaired in patients with PNH, given the range of signs, symptoms and co-morbidities that often exist in these patients
- Symptoms can include disabling fatigue, difficulty performing daily activities, pain and dyspnea
Next: Presentation of PNH
References:
1. Parker C, Omine M, Richards S, et al. Diagnosis and management of paroxysmal nocturnal hemoglobinuria. Blood. 2005;106:3699-3709
2. Hillmen P, Lewis SM, Bessler M, Luzzatto L, Dacie JV. Natural history of paroxysmal nocturnal hemoglobinuria. N Engl J Med. 1995;333:1253-1258.
3. Johnson RJ, Hillmen P. Paroxysmal nocturnal hemoglobinuria: nature's gene therapy? J Clin Pathol Mol Pathol. 2992;55:145-152.
4. Brodsky RA. Paroxysmal nocturnal hemoglobinuria. In: Hoffman R, Benz EJ, Shattil SJ, et al. eds. Hematology. 4th ed. Philadelphia, PA: Elsevier Churchill Livingstone. 2005:419-427.
5. Luzzatto L, Gianfaldoni G. Recent advances in biological and clinical aspects of paroxysmal nocturnal hemoglobinuria. Int J Hematol. 2006;84:104-112.
6. Rosse WF, Hillmen P, Schrieber AD. Immune-mediated hemolytic anemia. Hematology. (Am Soc Hematol Educ Program) January 2004:48-62.
7. Hill A, Hillmen SJ, Elebute D, et al. Sustained response and long-term safety of eculizumab in paroxysmal nocturnal hemoglobinuria. Blood. 2005;106:2559-2565.
8. Besa EC. Paroxysmal nocturnal hemoglobinuria. eMedicine. August 2006;1-11. Available at: http://www.emedicine.com/med/topic2696.htm Accessed: 5/17/2007.
9. Rother RP, Bell L, Hillmen P, Gladwin MT. The clinical sequelae of intravascular hemolysis and extracellular plasma hemoglobin. JAMA. 2005;293:1653-1662.
10. Hillmen P, Young NS, Schubert J, et al. The complement inhibitor eculizumab in paroxysmal nocturnal hemoglobinuria. N Engl J Med. 2006;355:1233-1243.
11. Socié G, Mary J-Y, De Gramont A, et al. Paroxysmal nocturnal hemoglobinuria: long-term follow-up and prognostic factors. Lancet. 1996;348:573-577.