Increasing Incidence and Prevalence of Acquired Hemolytic Anemias in Denmark, 1980–2016
Received 18 February 2020
Accepted for publication 8 April 2020
Published 22 May 2020 Volume 2020:12 Pages 497—508
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Professor Irene Petersen
Dennis Lund Hansen,1,2 Sören Möller,1,3 Kjeld Andersen,1,4 David Gaist,1,5 Henrik Frederiksen1,2
1Department of Clinical Research, University of Southern Denmark, Odense, Denmark; 2Department of Hematology, Odense University Hospital, Odense, Denmark; 3OPEN, Odense University Hospital, Odense, Denmark; 4Department of Psychiatry, Odense, Region of Southern Denmark, Odense, Denmark; 5Neurology Research Unit, Department of Neurology, Odense University Hospital, Odense, Denmark
Correspondence: Dennis Lund Hansen Email email@example.com
Background: Acquired hemolytic disorders—autoimmune hemolytic anemia (AIHA), cold agglutinin disease (CAD), paroxysmal nocturnal hemoglobinuria (PNH), drug-induced hemolysis (DIHA), and acquired hemolysis not otherwise specified (AHNOS)—are considered rare. Despite their potentially major health implications, data regarding their incidence and prevalence are scarce.
Methods: To fill this gap we collected data regarding all patients with acquired hemolytic disorder diagnoses in 1977– 2016 from the Danish National Patient Register. These data were linked with vital and migration status information from the Danish Civil Registration System. From these data combined with annual demographic data for the background population, we calculated age- and sex-specific incidence rates and prevalence proportions of acquired hemolytic disorders for specified time periods.
Results: Our analysis included 5868 patients with acquired hemolytic disorders (2715 with AIHA, 112 CAD, 397 DIHA, 116 PNH, and 2154 AHNOS). The incidence rates per 100 000 person-years in 1980– 1993 and 2008– 2016 were 0.81 and 1.77 for AIHA, 0.31 and 0.12 for DIHA, and 0.04 and 0.08 for PNH, respectively. The 2008– 2016 CAD incidence rate was 0.18/100 000 person-years, CAD diagnosis code was not defined before 1994. All incidence rates increased with age. The prevalence proportion per 100 000 persons in 1980 and 2015 was 2.52 and 17.01 for AIHA, 0.80 and 1.50 for DIHA, and 0.18 and 1.04 for PNH. CAD prevalence in 2015 was 1.04/100 000 persons.
Conclusion: Acquired hemolytic anemia incidence rates and prevalence proportions with the exception of DIHA are markedly increasing.
Keywords: autoimmune hemolytic anemia, cold agglutinin disease, paroxysmal nocturnal hemoglobinuria, drug-induced hemolytic anemia, incidence, prevalence
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