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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Arq. Neuro-Psiquiatr. vol.51 no.2 São Paulo June 1993

http://dx.doi.org/10.1590/S0004-282X1993000200001 

Dengue: muscle biopsy findings in 15 patients

 

Dengue: achados de biópsia muscular em 15 pacientes

 

 

S.M.F. MalheirosI; A.S.B. OliveiraI; B. SchmidtII; J.G. Camargo LimaI; A.A. GabbaiI

IDepartment of Neurology, Escola Paulista de Medicina, São Paulo
IIDepartment of Pathology, Escola Paulista de Medicina, São Paulo

 

 


SUMMARY

Dengue is known to produce a syndrome involving muscles, tendons and joints. The hallmark of this syndrome is severe myalgia but includes fever, cutaneous rash, and headache. The neuromuscular aspects of this infection are outlined only in isolated reports, and the muscle histopathological features during myalgia have not been described. In order to ascertain the actual neuromuscular involvement in dengue and better comprehend the histological nature of myalgia, we performed a clinical and neurological evaluation, a serum CPK level and a muscle biopsy (with histochemistry) in 15 patients (4 males), median age 23 years (range 14-47) with classic dengue fever, serologically confirmed, during the bra-zilian dengue epidemics from September 1986 to March 1987. All patients had a history of fever, headache and severe myalgia. Upon examination 4 had a cutaneous rash, 3 had fever, and 3 a small hepatomegaly. The neurological examination was unremarkable in all and included a manual muscle test. CPK was mildly elevated in only 3 patients. Muscle biopsy revealed a light to moderate perivascular mononuclear infiltrate in 12 patients and lipid accumulation in 11. Mild mitochondrial proliferation was seen in 3, few central nuclei in 3, rare foci of myonecrosis in 3, and 2 patients had type grouping. Dengue in our patients, produced myalgia but no detectable muscle weakness or other neuromuscular involvement. The main histopathological correlation with myalgia seems to be a perivascular mononuclear infiltrate and lipid accumulation.

Key words: dengue, muscle, myalgia.


RESUMO

A síndrome clínica produzida pelo vírus da dengue, inclui febre, exantema, cefaléia e especialmente mialgia. Entretanto, as possiveis alterações morfológicas do músculo esquelético, eventualmente relacionadas com a mialgia, ainda não haviam sido estudadas em seres humanos com dengue. Nosso objetivo foi estudar o substrato, anatomopatológico da mialgia nesses pacientes. Foram avaliados 15 pacientes com diagnóstico de dengue, forma clássica, com idades variando de 14 a 47 anos (mediana de 23 anos), sendo 4 do sexo masculino e 11 do sexo feminino, através de exame clínico e neurológico, exames laboratoriais e biópsia muscular com histoquímica, durante a epidemia de dengue em Alagoas, em 1987. Todos os pacientes apresentavam história de cefaléia, febre e mialgia intensa, sem fraqueza muscular. Ao exame clínico observou-se exantema em 4 pacientes, febre em 3 e discreta hepatomegalia em 3. O exame neurológico foi normal em todos e a enzima CK sérica estava pouco elevada em 3 pacientes. A biópsia muscular revelou discreto infiltrado inflamatório mononuclear perivascular em 12 pacientes, acúmulo lipídico em 11, predominância de fibras do tipo I em 6, raros focos de necrose em 3, proliferação mitocondrial em 3, centralização nuclear em 3 e "type grouping" em 2. As alterações mais frequentemente observadas na biópsia muscular, infiltrado inflamatório perivascular e acúmulo lipídico, podem estar relacionadas com a mialgia.

Palavras-chave: dengue, músculo, mialgia.


 

 

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

 

 

Aknowledgements — We are grateful to Dr. Fernando Lira Neto for referring the patients to us and for his assistance during our stay in Maceió, to Instituto Adolfo Lutz (São Paulo, SP, Brasil) for performing the IgM antibody detections by Mac ELISA and the virus isolation, and to Instituto Evandro Chagas (Belém, PA, Brasil) for performing the hemagglutination inhibition tests.

 

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Aceite: 08-novembro-1992.

 

 

Dr. Acary S.B. Oliveira — Department of Neurology, Escola Paulista de Medicina — Rua Botucatu 720 — 04023-900 São Paulo SP — Brasil.

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