Sickle-cell disease epidemiology and demographics: Difference between revisions

Jump to navigation Jump to search
No edit summary
No edit summary
Line 4: Line 4:


==Overview==
==Overview==
Certain races and geographic territories are more commonly affected by sickle cell disease.
Certain races and geographic territories are more commonly affected by sickle cell disease. These geographic areas include Africa, India, and Middle East.


==Epidemiology and Demographics==
==Epidemiology and Demographics==

Revision as of 04:59, 5 September 2016

Sickle-cell disease Microchapters

Home

Patient Information

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Sickle-cell disease from other Diseases

Epidemiology & Demographics

Risk Factors

Screening

Natural History, Complications & Prognosis

Diagnosis

History & Symptoms

Physical Examination

Laboratory Findings

X Ray

CT

MRI

Echocardiography or Ultrasound

Other Imaging Findings

Other Diagnostic Studies

Treatment

Medical Therapy

Surgery

Primary Prevention

Secondary Prevention

Future or Investigational Therapies

Case Studies

Case #1

Sickle-cell disease epidemiology and demographics On the Web

Most recent articles

Most cited articles

Review articles

CME Programs

Powerpoint slides

Images

American Roentgen Ray Society Images of Sickle-cell disease epidemiology and demographics

All Images
X-rays
Echo & Ultrasound
CT Images
MRI

Ongoing Trials at Clinical Trials.gov

National Guidelines Clearinghouse

NICE Guidance

FDA on Sickle-cell disease epidemiology and demographics

CDC on Sickle-cell disease epidemiology and demographics

Sickle-cell disease epidemiology and demographics in the news

Blogs onSickle-cell disease epidemiology and demographics

Directions to Hospitals Treating Sickle-cell disease

Risk calculators and risk factors for Sickle-cell disease epidemiology and demographics

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Shyam Patel [2]

Overview

Certain races and geographic territories are more commonly affected by sickle cell disease. These geographic areas include Africa, India, and Middle East.

Epidemiology and Demographics

Sickle cell disease is known to have a high prevalence in Africa (specifically the sub-Saharan region), India, and the Middle East. Different regions of the world display different frequencies of genotypes of the various sickle cell subtypes. Sickle cell disease largely affects people of African descent. The incidence of sickle cell disease is 312,000 per year worldwide. Among these, 76% (236,000 people) are born in sub-Saharan Africa.[1] The current prevalence of sickle cell disease is 20 million, and nearly 50% of affected people are in Africa. India comprises 5-10 million people with sickle cell disease. Regarding allele frequencies, the S (glutamic acid to valine) and C (glutamic acid to lysine) alleles are highest in Africa.[2] In a study of three cohorts in Nigeria and Sudan, the frequency of HbSS was 88-96%. The frequency of HbSC was 4-12%.[1] It affects 1 in 400 African Americans, and a total of 89,000 Americans.[3]

People from India also have higher frequencies of sickle cell alleles compared to others. Compared to people from Africa, those from India have a lower frequency of the HbSS genotype (30-70%) and a higher frequency of sickle cell-beta-thalassemia (HbSB) genotype.[1] The heterozygote prevalence (HbAS) in India of sickle disease varies from 1-40%. Certain tribal populations in India have high prevalences of sickle cell trait and/or disease. For example, Madhya Pradesh has the highest prevalence, with more tan 960000 heterozygotes and nearly 68000 homozogotes. [4]

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4510747/bin/IJMR-141-509-g001.jpg Frequency of sickle cell trait in various provinces of India.[4]

The frequency of sickle cell alleles are highest in regions of the country where malaria is endemic.[1] The reason for this is that, from an evolutionary standpoint, the presence of sickle cell alleles and abnormal hemoglobin confers a protective advantage against malaria. The causative agents of malaria, Plasmodium, is less likely to infect diseased red blood cells.[1] This concept is known as the heterozygote advantage.

Besides Africa and India, other geographic regions are affected by particular sickle cell phenotypes. The HbSC phenotype. for example, is prevalent in geographic areas such as Burkina Faso.[1] HbS-beta-thalassemia is commonly found in Greece.[1] The nomenclature of certain sickle cell hemoglobinopathies and haplotypes is based on the region in which the prevalence is high. For example, hemoglobin Senegal has been found in Senegal. Others include hemoglobin Benin and hemoglobin Bantu.[2]

The prevalence of sickle cell disease in the United States is relatively low: approximately 100,000 people are affected.[1] However, sickle cell disease poses a significant challenge to the American health care system. There is a high frequency of emergency department visits by patients with sickle cell disease. Over a two-year period, there were more than 97,000 visits amongst 8 states.[3] Among these visits, 52,107 warranted hospitalization.

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Saraf SL, Molokie RE, Nouraie M, Sable CA, Luchtman-Jones L, Ensing GJ; et al. (2014). "Differences in the clinical and genotypic presentation of sickle cell disease around the world". Paediatr Respir Rev. 15 (1): 4–12. doi:10.1016/j.prrv.2013.11.003. PMC 3944316. PMID 24361300.
  2. 2.0 2.1 Makani J, Ofori-Acquah SF, Nnodu O, Wonkam A, Ohene-Frempong K (2013). "Sickle cell disease: new opportunities and challenges in Africa". ScientificWorldJournal. 2013: 193252. doi:10.1155/2013/193252. PMC 3988892. PMID 25143960.
  3. 3.0 3.1 Brandow AM, Liem R (2011). ""Sickle Cell Disease in the Emergency Department: Atypical Complications and Management"". Clin Pediatr Emerg Med. 12 (3): 202–212. doi:10.1016/j.cpem.2011.07.003. PMC 3172721. PMID 21927581.
  4. 4.0 4.1 Colah RB, Mukherjee MB, Martin S, Ghosh K (2015). "Sickle cell disease in tribal populations in India". Indian J Med Res. 141 (5): 509–15. PMC 4510747. PMID 26139766.

Template:WH Template:WS