A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease

Abstract Background and purpose Sickle cell disease (SCD) is a collection of rare inherited blood disorders affecting approximately 100,000 people in the U.S. and 20–25 million people globally. Individuals with SCD experience recurrent episodes of severe and unpredictable pain that are caused by vas...

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Autores principales:	Ahmar U. Zaidi, Alexander K. Glaros, Soyon Lee, Taiji Wang, Rhea Bhojwani, Eric Morris, Breanne Donohue, Jincy Paulose, Şerban R. Iorga, Dave Nellesen
Formato:	article
Lenguaje:	EN
Publicado:	BMC 2021
Materias:	Vaso-occlusive crisis Pain crisis Sickle cell disease Real-world Incidence Prevalence Medicine R
Acceso en línea:	https://doaj.org/article/86a5495ff746458d910da729d8cdcc5e
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spelling	oai:doaj.org-article:86a5495ff746458d910da729d8cdcc5e2021-11-08T10:56:59ZA systematic literature review of frequency of vaso-occlusive crises in sickle cell disease10.1186/s13023-021-02096-61750-1172https://doaj.org/article/86a5495ff746458d910da729d8cdcc5e2021-11-01T00:00:00Zhttps://doi.org/10.1186/s13023-021-02096-6https://doaj.org/toc/1750-1172Abstract Background and purpose Sickle cell disease (SCD) is a collection of rare inherited blood disorders affecting approximately 100,000 people in the U.S. and 20–25 million people globally. Individuals with SCD experience recurrent episodes of severe and unpredictable pain that are caused by vaso-occlusive crises (VOCs), a hallmark of the disease. VOCs are the primary cause of hospitalization in SCD, result in missed workdays and school days, and decrease quality of life (QoL). Although VOCs cause significant burden in the lives of individuals with SCD, there is no synthesis on the frequency of VOCs in the real world. This systematic literature review sought to identify literature describing the frequency of VOCs experienced by individuals with SCD in real-world settings. Methods MEDLINE and 6 congresses were searched (date range: January 1, 2000 to June 30, 2020). Studies were reviewed independently by two researchers. Studies assessing frequency or prevalence of VOCs or VOC-related outcomes were included. Results Of 1438 studies identified in the search, 52 met pre-specified inclusion and exclusion criteria. Reported frequency of VOCs varied widely ranging from a mean or median of 0 VOCs/year to 18.2 VOCs/year. The proportion of patients experiencing ≥ 3 VOCs/year ranged from 4 to 67% and the proportion of patients experiencing ≥ 5 VOCs/year ranged from 18 to 59%. Measures of VOC severity were limited, with 13 studies considering frequency of complicated VOCs and only 1 study reporting duration of VOC episodes. Conclusions This is the first study to systematically assess published evidence pertaining to VOCs in real-world settings. Reported VOC frequency in real-world settings varied widely, with a majority of studies only considering VOCs managed in an inpatient or outpatient setting. Studies that considered VOCs managed at home reported a higher frequency of VOCs, suggesting that many studies may underestimate the frequency of VOCs. This systematic literature review (SLR) highlights the need for consistent reporting of (1) self-reported VOCs, including those managed at home, (2) definitions of VOCs, (3) complicated VOCs, and (4) duration of VOC episodes in literature.Ahmar U. ZaidiAlexander K. GlarosSoyon LeeTaiji WangRhea BhojwaniEric MorrisBreanne DonohueJincy PauloseŞerban R. IorgaDave NellesenBMCarticleVaso-occlusive crisisPain crisisSickle cell diseaseReal-worldIncidencePrevalenceMedicineRENOrphanet Journal of Rare Diseases, Vol 16, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Vaso-occlusive crisis Pain crisis Sickle cell disease Real-world Incidence Prevalence Medicine R
spellingShingle	Vaso-occlusive crisis Pain crisis Sickle cell disease Real-world Incidence Prevalence Medicine R Ahmar U. Zaidi Alexander K. Glaros Soyon Lee Taiji Wang Rhea Bhojwani Eric Morris Breanne Donohue Jincy Paulose Şerban R. Iorga Dave Nellesen A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
description	Abstract Background and purpose Sickle cell disease (SCD) is a collection of rare inherited blood disorders affecting approximately 100,000 people in the U.S. and 20–25 million people globally. Individuals with SCD experience recurrent episodes of severe and unpredictable pain that are caused by vaso-occlusive crises (VOCs), a hallmark of the disease. VOCs are the primary cause of hospitalization in SCD, result in missed workdays and school days, and decrease quality of life (QoL). Although VOCs cause significant burden in the lives of individuals with SCD, there is no synthesis on the frequency of VOCs in the real world. This systematic literature review sought to identify literature describing the frequency of VOCs experienced by individuals with SCD in real-world settings. Methods MEDLINE and 6 congresses were searched (date range: January 1, 2000 to June 30, 2020). Studies were reviewed independently by two researchers. Studies assessing frequency or prevalence of VOCs or VOC-related outcomes were included. Results Of 1438 studies identified in the search, 52 met pre-specified inclusion and exclusion criteria. Reported frequency of VOCs varied widely ranging from a mean or median of 0 VOCs/year to 18.2 VOCs/year. The proportion of patients experiencing ≥ 3 VOCs/year ranged from 4 to 67% and the proportion of patients experiencing ≥ 5 VOCs/year ranged from 18 to 59%. Measures of VOC severity were limited, with 13 studies considering frequency of complicated VOCs and only 1 study reporting duration of VOC episodes. Conclusions This is the first study to systematically assess published evidence pertaining to VOCs in real-world settings. Reported VOC frequency in real-world settings varied widely, with a majority of studies only considering VOCs managed in an inpatient or outpatient setting. Studies that considered VOCs managed at home reported a higher frequency of VOCs, suggesting that many studies may underestimate the frequency of VOCs. This systematic literature review (SLR) highlights the need for consistent reporting of (1) self-reported VOCs, including those managed at home, (2) definitions of VOCs, (3) complicated VOCs, and (4) duration of VOC episodes in literature.
format	article
author	Ahmar U. Zaidi Alexander K. Glaros Soyon Lee Taiji Wang Rhea Bhojwani Eric Morris Breanne Donohue Jincy Paulose Şerban R. Iorga Dave Nellesen
author_facet	Ahmar U. Zaidi Alexander K. Glaros Soyon Lee Taiji Wang Rhea Bhojwani Eric Morris Breanne Donohue Jincy Paulose Şerban R. Iorga Dave Nellesen
author_sort	Ahmar U. Zaidi
title	A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
title_short	A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
title_full	A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
title_fullStr	A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
title_full_unstemmed	A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
title_sort	systematic literature review of frequency of vaso-occlusive crises in sickle cell disease
publisher	BMC
publishDate	2021
url	https://doaj.org/article/86a5495ff746458d910da729d8cdcc5e
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A systematic literature review of frequency of vaso-occlusive crises in sickle cell disease

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