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Arq. Neuro-Psiquiatr. vol.61 no.2A São Paulo June 2003
Mielite transversa aguda de início precoce precedida de vacinação para hepatite B e infecção viral respiratória: relato de caso
Luiz Fernando FonsecaI; Thelma Ribeiro NoceII; Maria Letícia Gambogi TeixeiraII; Antônio Lúcio Teixeira JrIII; Marco Aurélio Lana-PeixotoIV
ICoordenador da Residência em Neurologia Infantil do Centro Geral de Pediatria (CGP), FHEMIG, Belo Horizonte MG, Brasil
IIResidente de Neurologia Infantil do CGP-FHEMIG
IIIResidente de Neurologia do Hospital das Clínicas (HC) da Universidade Federal de Minas Gerais, Belo Horizonte MG, Brasil (UFMG)
IVProfessor Adjunto do Departamento de Neurologia da Faculdade de Medicina da UFMG e Coordenador do Centro de Investigação em Esclerose Múltipla (CIEM-Minas) do HC da UFMG
Acute transverse myelitis is an acute inflammatory process of the spinal cord and it is a rare clinical syndrome in childhood. In this paper, we report a case of 3 years-old boy who developed acute onset tetraparesia following a viral respiratory infecction and hepatitis B vaccination. Magnetic resonance imaging of the spinal cord disclosed signal-intensity abnormalities from C4 to C3. A diagnosis of acute transverse myelitis was made and the patient was treated with IV methylprednisolone and IV immunoglobulin. The child had a fair outcome despite of the very acute course of the disease and the presence of a cervical sensory level which usually harbor a poor prognosis.
Key words: acute transverse myelitis, childhood, hepatitis B vaccination, respiratory infection.
A mielite transversa aguda é processo inflamatório agudo da medula espinhal de ocorrência rara na infância. Neste artigo, reportamos o caso de um menino de 3 anos que desenvolveu tetraparesia aguda precedida de infecção viral respiratória e pós-vacinação para Hepatite B. A imagem pela Ressonância Magnética da medula espinhal revelou anormalidade de aumento de sinal em C4-T3. Após o diagnóstico da mielite transversa aguda, o paciente foi tratado com metilprednisolona e imunoglobulina. Embora a doença tenha se apresentado de forma aguda e acompanhada de nível sensitivo, o que usualmente levaria a um prognóstico sombrio, a criança evoluiu favoravelmente.
Palavras-chave: mielite transversa aguda, infância, vacinação, hepatite B, infecção viral respiratória.
Acute transverse myelitis (ATM) is an acute inflammatory process of the spinal cord that can be classified in three distinct groups according to its etiology: myelitis due to a direct infection of the spinal cord; myelitis in the context of a systemic disease, such as leukemia or a connective tissue disorder; and myelitis with a suspected autoimmune basis1. The last group is the most common form of ATM and may occur as a post- or parainfectious condition2,3. Respiratory and intestinal infections are important potential triggers of ATM, but some postvaccinal cases have also been reported1. Direct infection of the spinal cord is a common cause of ATM in developing countries. In Brazil myelitis due schistosomiasis mansoni is well known although its prevalence in childhood remains to be determined4-6. ATM is a rare clinical condition in childhood and adolescence. In this group it mostly occurs in children over 5 years of age7. Although all functions of spinal cord may be disturbed, different degrees of disability occur. It has been observed that functional recovery depends much on the clinical presentation; an abrupt and severe onset usually pointing to a poorer prognosis1,8.
In this paper, we report a case of very early-onset ATM following a viral respiratory infection and hepatitis B vaccination. We discuss the role of these events as trigger factors in the development of ATM.
A 3-year-old white boy was admitted to the Pediatric Intensive Care Unit for evaluation of an acute-onset flaccid tetraparesia. One day prior to his admission, he complained severe pain in his neck. Few hours later, he was already unable to stand or use his hands. The mental status had not changed and there was no report of headache or blurred vision. Ten days previously he had received the first dose of the hepatitis B vaccine and presented mild upper airway respiratory symptoms such as rhinorrhea and cough but no fever. His previous medical history and family history were unremarkable. The child lived in Belo Horizonte with his parents and a healthy 6-year-old brother. There was no contact of the children with natural water or domestic animals. At admission he presented urinary and intestinal retention and physical examination demonstrated an afebrile, eupneic child with a mean blood pressure of 64 mmHg and a pulse rate of 132 rpm. No cognitive or cranial nerves disturbances were noted. He could not move any limb, the muscle tone was decreased, the deep tendon reflexes throughout absent and a sensory level was noticed at C5.
Laboratory work-up revealed a hematocrit of 28.6%, white blood cell count of 9200 cells/mm3 (66% neutrophils, 32% lymphocytes, 1% monocytes, 1% eosinophils), and normal platelet count. Coagulogram, ionogram, blood urea nitrogen and creatinine concentrations and C-reactive protein were all within normal range. Magnetic resonance imaging (MRI) of the spinal cord disclosed enlargement from C4 to T3 on T1-weighed images (Fig 1). On T2-weighed images, increased signal intensity was noticed over the same spinal segments (Fig 2). Cerebrospinal fluid (CSF) examination was unrevealing (2 WBCs, 100% ly; 8 RBCs; protein level of 25 mg/dl and glucose level of 82 mg/dl).
A diagnosis of ATM was made and the patient was treated with IV methylprednisolone (30mg/Kg/day for five days) and IV immunoglobulin (400 mg/Kg/day for five days). He got better in the next six days with some voluntary movements in the limbs and recovery of the deep reflexes and was then transferred to the ward. Ten days later he presented low-grade fever, tachypnea and abdominal distension but no sign of neurological deterioration. Chest x-rays revealed consolidation in the inferior right hemithorax. The child was given oxacylline and gentamicine as treatment of nosocomial pneumonia but he developed respiratory insufficiency demanding mechanical ventilation. He was readmitted to the Intensive Care Unit and was put on vancomicine and cefepime with full respiratory recovery after 29 days of mechanical ventilatory support and tracheostomy. Follow-up at the Outpatient Clinics six months later showed that the child has mild bronchiectasis and atelectasias ascribed to the long period on mechanical ventilation but presents impressive neurological recovery, being able to walk with intermittent support and fully control his bladder and intestine functions. He has been on respiratory and motor rehabilitation programs.
The differential diagnosis of an acute disease of the spinal cord comprises a wide range of conditions1,7,8. Bacterial abscesses, spinal cord tumors, vascular malformations and haematomas can be usually ruled out by image methods. In the present case, MRI study failed to reveal any space-occupying condition, but the T2 signal abnormalities and spinal enlargement at levels related to clinical signs pointed to the diagnosis of ATM.
Transverse myelitis is a clinical syndrome which can be associated with a number of different conditions. It is, therefore, necessary to identify either a direct infection, a systemic disease or an autoimmune (post-infeccious or post-vaccinal) process9,10. Our patient had no evidence of a systemic disease (like lupus, leukemia), neither a history of contact with a potentially infective agent of the spinal cord (e.g. borreliosis, cat-scratch disease, toxocariasis, schistosomiasis). Similarly he had no clinical evidence of infections caused by viruses such as varicella-zoster virus, herpes simplex virus 1 and 2, Epstein-Barr virus, cytomegalovirus, coxsackievirus, echovirus, HIV which seldomly have been related to ATM.
It is probable that this child had post-infeccious or post-vaccinal ATM as the neurologic symptoms followed a viral respiratory infection and started ten days following hepatitis B immunization. An airway viral infection (adenovirus, respiratory syncytial virus, influenza) suggested by the mild respiratory symptoms presented by the patient also could be the index or trigger event. The mean interval from infection to the onset of neurological symptoms is reported to be between nine days to three weeks3. On the other hand the role played by hepatitis B vaccine in this case cannot be overemphasized. Recent reports have linked hepatitis B immunization to central nervous system demyelinating lesions11,12. It is noteworthy, however, that such cases reported in the literature consisted of acute disseminated encephalomyelitis (ADEM), an acute or subacute demyelinating disease of the neuraxis involving the brain and spinal cord with multifocal neurological deficits13-15. In the present case there was no evidence of brain involvement.
Multiple sclerosis (MS) is also an important differential diagnosis of ATM13-15. MS is an inflammatory demyelinating multifocal disease with a relapsing-remitting or a progressive course very rarely occurring under six years of age14-16. In addition to that MS lesions are usually less extensive and spinal cord enlargement is exceptional. On the contrary, in ATM demyelination spreads to multiple spinal segments and enlargement of the spinal cord is a common finding as in our patient.
Guillain-Barré syndrome could be also considered because of its high incidence and clinical similarities to ATM17,18. As a matter of fact, some clinical features of the present case, such as flaccid tetraparesis and the possible involvement of respiratory muscles, might point to the diagnosis of Guillain-Barré syndrome rather than ATM. However, the albumin-cytologic dissociation in the CSF which remains as one of the most relevant feature of the disease was lacking. Additionally the MRI lesions were in favor of the diagnosis of ATM.
The clinical picture of ATM includes partial or complete paraplegia or quadriplegia, decrease or loss of deep reflexes, sensory impairment and varying degrees of bladder and bowel disturbance. Usually the full-blown disease is reached four weeks after onset, but in most cases the peak occurs in the first week with the level of involvement set at the onset2,3. In a few patients, however, the disease has an ascending course with risk of asphyxia when upper cervical segments (C3-C5) are involved. In the present case, the onset was sudden and the cervical spinal cord immediately involved. Notwithstandingly the child did not develop primary respiratory insufficiency and he has had a good neurological recovery.
Treatment of ATM is still a matter of controversy in the literature1,3. The efficacy of intravenous methylprednisolone in immune-mediated neurological disorders such as optic neuritis and MS, led some authors to use it in children with ATM19,20. Recent studies have confirmed its efficacy shortening motor recovery and significantly increasing the proportion of patients able to walk independently at follow-up when compared to a historical control group19,20. Our patient's fair outcome in spite of the very acute course of the disease and the presence of a cervical sensory level, which usually harbor a poor prognosis, may be well ascribed to the early use of methylprednisolone1,2,8.
In spite of the history of both a viral respiratory infection and hepatitis B immunization preceding the onset of ATM, the actual role played by each one in the development of this disease remains uncertain. It is possible that the concomitant exposition to two different antigens may increase the risk of an abnormal immune-mediated response in genetically susceptible individuals16.
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Received 19 August 2002, received in final form 16 October 2002
Accepted 5 November 2002
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