CC BY-NC-ND 4.0 · Arquivos Brasileiros de Neurocirurgia: Brazilian Neurosurgery 2017; 36(02): 096-100
DOI: 10.1055/s-0037-1603512
Review Article | Artigo de Revisão
Thieme Revinter Publicações Ltda Rio de Janeiro, Brazil

Chronic Subdural Hematoma Spontaneous Resolution

Resolução espontânea de hematoma subdural crônico
Nícollas Nunes Rabelo
1   Department of Neurosurgery, Hospital Santa Casa, Ribeirão Preto, SP, Brazil
,
Vitor Hugo Honorato Pereira
1   Department of Neurosurgery, Hospital Santa Casa, Ribeirão Preto, SP, Brazil
,
George Santos dos Passos
1   Department of Neurosurgery, Hospital Santa Casa, Ribeirão Preto, SP, Brazil
,
Luciano José Silveira Filho
1   Department of Neurosurgery, Hospital Santa Casa, Ribeirão Preto, SP, Brazil
,
André Luiz Cicilini
2   Medical Student, Universidade de Ribeirão Preto - Unaerp, Ribeirão Preto, SP, Brazil
,
Neiffer Nunes Rabelo
3   Medical Student, Faculdade Atenas, Paracatu, MG, Brazil
,
Luiz Antônio Araujo Dias Junior
1   Department of Neurosurgery, Hospital Santa Casa, Ribeirão Preto, SP, Brazil
,
Carlos Umberto Pereira
4   Department of Neurosurgery, Fundação Beneficiente Hospital de Cirurgia, Aracaju, Sergipe, Brazil
,
Luiz Antônio Araujo Dias
5   Neurosurgeon and Professor, Department of Neurosurgery, Hospital Santa Casa, Ribeirão Preto, SP, Brazil
› Institutsangaben
Weitere Informationen

Publikationsverlauf

05. Februar 2017

27. März 2017

Publikationsdatum:
22. Mai 2017 (online)

Abstract

Introduction Chronic subdural hematoma (CSH) is a hemorrhagic brain injury that persists for more than 21 days after its initial formation. The incidence is predominantly among the elderly population (> 65 years), and varies from 58 to 74/100,000 inhabitants. Spontaneous resolution is considered variable; in the literature series, it is < 1–20% of cases.

Objectives To expose the CSH pathophysiological mechanisms of spontaneous resolution and some treatments that lead to hematoma volume reduction.

Methods Literature review between 1971 to 2016, using the PubMed, Medline, Embase, Scielo, LILACS and Cochrane databases using key-words, with inclusion and exclusion criteria.

Discussion Spontaneous resolution of the CSH pathophysiology is controversial; however, it can be attributed to four basic mechanisms: 1) outer capsule membrane maturation; 2) decreased fibrinolysis; 3) bidirectional flow of blood vessels; and 4) platelet plug. Some drugs, such as mannitol, corticosteroids, tranexamic acid and atorvastatin, contribute to CSH resolution, since they change the capsule membrane permeability, and inhibit the fibrinolytic and inflammatory systems.

Conclusion Spontaneous resolution is unpredictable; in some cases, it has a large temporal evolution (of up to 6 years). It occurs in small or laminar collections, asymptomatic or with transient neurological symptoms, and the pathophysiology is still controversial to this day. Therefore, surgical treatment should remain the first option, even though the conservative management is adopted for some patients. Rigorous outpatient and radiological follow-up are recommended.

Resumo

Introdução O hematoma subdural crônico (HSDC) é uma lesão cerebral hemorrágica que persiste por mais de 21 dias após o começo de sua formação. A sua incidência é predominantemente na população idosa (> 65 anos), e varia de 58–74 /100.000 habitantes, e sua resolução espontânea é considerada rara e variável nas séries da literatura em < 1–20% dos casos.

Objetivos Expor os mecanismos fisiopatológicos que favorecem a resolução espontânea do HSDC e alguns tratamentos que favorecem a redução do volume do hematoma.

Métodos Revisão bibliográfica entre 1971 e 2016, utilizando as bases de dados PubMed, Medline, Embase, Scielo, LILACS e Cochrane, por meio de palavras-chave, com critérios de inclusão e exclusão.

Discussão A fisiopatologia da resolução espontânea dos HSDCs é controversa, porém pode ser atribuída a quatro mecanismos: 1) maturação da membrana externa da cápsula; 2) diminuição da fibrinólise; 3) fluxo bidireccional de vasos sanguíneos; e 4) tampão plaquetário. Alguns medicamentos, tais como manitol, corticoesteroides, ácido tranexâmico e atorvastatina, também podem favorecer a resolução dos HSDCs, uma vez que alteram a permeabilidade da membrana da cápsula e inibem os sistemas fibrinolítico e inflamatório.

Conclusão A resolução espontânea é imprevisível; em alguns casos, tem ampla evolução temporal em até 6 anos. Ocorre em coleções pequenas ou laminares, assintomáticas ou com sintomas neurológicos transitórios, e sua fisiopatologia ainda hoje é controversa. Portanto, o tratamento cirúrgico deve continuar sendo a primeira opção, embora se adote uma conduta conservadora para alguns pacientes. O seguimento ambulatorial e radiológico rigoroso é recomendado.

 
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