versión impresa ISSN 0037-8682
Rev. Soc. Bras. Med. Trop. vol.43 no.1 Uberaba enero/feb. 2010
Avaliação das alterações histológicas hepáticas e infecções oportunistas em pacientes brasileiros infectados pelo HIV
Graziella Hanna PereiraI; Diva Carvalho Collarile YamaguttiII; João Silva de MendonçaIII
IDepartment of Infectious Diseases and Infection Control, Hospital Brigadeiro, São Paulo, SP, Brazil
IIDepartment of Pathology, Hospital Servidor Público Estadual, São Paulo, SP, Brazil
IIIDepartment of Infectious Diseases and Infection Control, Hospital Servidor Público Estadual, São Paulo, SP, Brazil
INTRODUCTION: to evaluated the type histopathological hepatic lesions and opportunistic agents in Brazilian HIV-infected patients.
METHODS: we examined 52 percutaneous liver biopsies of 50 HIV-infected patients who had at least two of the following conditions: fever of unknown origin, unexplained severe emaciation, hepatomegaly or abnormal liver chemistry. The specimens were cultured for mycobacteria and fungi and stained by standard procedures.
RESULTS: reactive patterns, granulomatous hepatitis and chronic active hepatitis were verified in 28 (54%), 11 (21%) and 8 (15%) of the patients respectively. Opportunistic infections were diagnosed in 18 (36%) patients: mycobacteria in 12 (24%), Cryptococcus neoformans in 5 (10%) patients and mycobacteria and yeast was isolated from the same liver fragment in one patient.
CONCLUSIONS: mycobacteriosis was the most common opportunistic infection and liver tissue culture is an important method to detect opportunistic agents, even in the absence of histological lesions.
Key-words: Liver biopsy. Mycobacteriosis. AIDS. Liver histology.
INTRODUÇÃO: avaliar os tipos de lesões histopatológicas e infecções oportunistas de Brasileiros infectados pelo HIV.
MÉTODOS: Foram analisadas 52 biópsias hepáticas percutâneas de 50 pacientes que apresentavam pelo menos duas das alterações: febre de origem indeterminada, emagrecimento inexplicado, hepatomegalia ou anormalidades na bioquímica hepática. O fragmento de tecido hepático foi submetido a histopatologia por métodos habituais e cultura para micobacteria e fungo.
RESULTADOS: padrão reacional, hepatite granulomatosa e hepatite crônica ativa foram encontrados em 28 (54%), 11 (21%) e 8 (15%) dos pacientes respectivamente. Infecções oportunistas foram diagnosticadas em 18 (36%) dos pacientes: micobacteria em 12 (24%), Cryptococcus neoformans em 5 (10%) pacientes e micobacteria e fungo foram isolados no mesmo fragmento em um paciente.
CONCLUSÕES: micobacteriose foi a infecção oportunista mais comum e a cultura de tecido hepático foi um importante método para detecção de infecções, mesmo na ausência de lesões histológicas.
Palavras-chaves: Biópsia hepática. Micobacteriose. SIDA. Histologia hepática.
Research involving AIDS patients has determined a high prevalence of underlying hepatic abnormalities. The spectrum and prevalence of different diseases among patients with AIDS varies between countries1.
Hepatic manifestations can be a harbinger of disseminated opportunistic infections in AIDS patients2. Liver biopsy is a useful technique for the diagnosis of fever of unknown origin (FUO) in HIV-infected patients. Early biopsy should be considered in patients with hepatosplenomegaly and above-normal alkaline phosphatase levels3. Many liver and pancreatic lesions caused by opportunistic agents have been diagnosed based on autopsy results4.
Studies in underdeveloped countries suggest that hepatic tuberculosis is the most common liver disease in AIDS patients1, followed by Mycobacterium avium complex infection, cytomegalovirus, toxoplasmosis, fungal infections, malignant tumors5 and concomitant pathologies2.
Few studies of liver complications in Brazilian patients have been conducted, some involving case reports of hepatic pathology secondary to opportunistic diseases in HIV-infected patients, associated with tuberculosis6, histoplasmosis7, and Salmonella-Schistosoma mansoni8. Histopathological exams of liver biopsies were not performed in these Brazilian AIDS studies.
We examined hepatic histopathological findings and the diagnosis of opportunistic agents in Brazilian HIV patients who were not yet on antiretroviral drug therapy. This situation is possible in countries without resources and in patients who have not been diagnosed or placed on HIV therapy.
The State Public Servants' Hospital (Hospital Servidor Público Estadual) is a public, tertiary care, teaching hospital that belongs to the Brazilian National Healthcare System (SUS). We analyzed 50 cases in which 52 percutaneous liver biopsy (PLB) had been performed. In two patients, the procedure was repeated due to clinical indications. Patients that presented at least two clinical or laboratory alterations including: prolonged fever, accentuated weight loss, hepatomegaly and liver function test abnormalities were selected for PLB. The following data was recorded for these patients: age, sex, alcohol abuse, use of medicines, as well as clinical symptoms, including fever, weight loss, hepatomegaly, signs of hepatic deficiency and abnormal laboratory parameters. Liver function test abnormalities were defined as above normal levels of serum transaminases, alanine aminotransferase (ALT) and aspartate aminotransferase (AST), alkaline phosphatase (Aph) and glutamic-transferase (Gt). The normal values considered were: ALT 5-35U/l, AST 8-40U/l, Aph 30-40U/l and Gt up to 30U/l.
All percutaneous liver biopsies were performed with a Menghini needle, using standard techniques.
Unfixed tissue was cultivated for Mycobacterium and fungi. Formalin-fixed tissue sections were stained with hematoxylin and eosin, Masson's trichrome, Prussian blue, Gomori-methenamine silver, periodic acid-Schiff and Ziehl-Neelsen stains. Histology was analyzed by a single pathologist (DCCY). The Chi square and Fisher exact tests were used to compare categorical variables (α = 0.05).
Among the 50 patients, 48 were male; median age was 35 years of age (range 16-60 years-old). Nine (18%) patients had alcohol abuse problems and 30% were illicit drug users.
Thirty (60%) patients presented opportunist infections, five (10%) had Kaposi's sarcoma, two (4%) had Hodgkin's lymphoma and one (2%) had idiopathic thrombocytopenic purpura. The clinical characteristics, laboratorial and histological findings of the patients are described in Table 1.
Liver biopsy showed histological alterations in 98% of the patients; the only patient who apparently had a normal liver (2%) was infected with mycobacteria. Two patients were submitted to two biopsies each, once after the initial diagnosis of acute hepatitis and the other 10 months later, after the disease had evolved to chronic active hepatitis in one patient and two months later in a patient with nonspecific reactive hepatitis that had evolved to acute cholestatic hepatitis.
Nonspecific reactive hepatitis (RH) involved hyperplasia and hypertrophy of the Kupffer cells (100%), hepatocelular degeneration (76%), inflammatory infiltration in the portal and periportal area (70%) and lobular (42%), sinusoidal dilatation (60%) and focal steatosis (56%) were observed in the liver biopsies. Granulomatous hepatitis (GH) presented lobular and portal granulomas, rarely formed by Langhans' cells, with minimal central necrosis. Mycobacteria were verified in three patients and yeast in five patients with RH. Among the 11 patients with GH, nine presented opportunistic infections (eight mycobacteria and one yeast, Figure 1). In one patient, extensive portal inflammation with Hodgkin's lymphoma was verified, associated with granulomas, with no infectious agents.
Mycobacteria were observed in 13 liver biopsies and yeast in six (five Cryptococcus neoformans and one unidentified yeast). One patient presented Cryptococcus and Mycobacteria in the same liver fragment. Liver biopsy permitted the diagnosis of opportunistic infections in nine (18%) patients, these included eight with mycobacteriosis and one with Cryptococcus infection.
The clinical alterations were not significantly correlated with the presence of opportunistic infections. Alkaline phosphatase was significantly altered in liver granuloma tissue. Levels of other liver enzymes, such as AST, ALT and Gt, were not correlated with histological findings. There was a significant relation between GH and opportunistic infections, specifically those caused by Mycobacteria. There was no correlation between histological findings and fungus infection (Table 2).
Among the 13 patients with a diagnosis of Mycobacteria, Ziehl-Neelsen staining was positive in six out of 12 (50%) patients, cultures were positive in all nine patients tested; Mycobacterium tuberculosis was identified in four of these. Due to a lack of hepatic tissue, histopathology was not performed for one patient and no cultures were made from samples of four patients. Among the patients diagnosed with fungi, two out of six were determined by staining and four out of five by specific culture.
Hepatic histological abnormalities were observed in all the patients; this frequency was higher than reported in other studies. Lanjewar et al1 reported 58% patients with significant pathological lesions; the most common pathological processes involving the liver appeared to be secondary to infections1. These findings could be explained by the phase of illness in these patients, with opportunistic disease occurring in 76%, along with drug abuse and frequent use of medicines.
Opportunistic infections were diagnosed in 36% of the patients, half of these by liver biopsy. Altered alkaline phosphatase levels were related to granulomatous hepatitis and mycobacteria infection. Garcia-Ordonez et al3 studied 58 HIV-infected patients who underwent PLB for evaluation of FUO in Spain. The diagnosis was established in 51 (87.9%) patients; tuberculosis (50%) and leishmaniasis (20.7%) were the most common. PLB was diagnostic in 25 (43.1%) cases, helpful in 13 (22.4%), and normal or nonspecific in the remaining 20 (34.5%); they concluded that PLB is a useful technique for the diagnosis of FUO in HIV-infected persons and that early PLB should be considered in patients with hepatosplenomegaly and increased alkaline phosphatase levels3. Other studies have reported similar conclusions2,9.
Echejoh et al10 evaluated postmortem hepatic histopathological findings in HIV patients in Nigeria; most (65%) patients had clinical tuberculosis. Granulomatous hepatitis, chronic hepatitis, nonspecific reactive hepatitis and steatosis were the most common hepatic histopathological lesions, occurring in 34, 20, 15 and 12% of patients, respectively. Seven percent had normal histological features10.
In our study, the histopathological findings were often nonspecific. A correlation was determined between granulomatous hepatitis and opportunistic hepatic infections, with prevalence of Mycobacterium tuberculosis, and Cryptococcus neoformans among the fungi. Culture for mycobacteriosis and of the deep mycoses was an important approach for the detection of opportunists, even when Ziehl-Neelsen and PAS staining of the liver was negative.
In conclusion, Mycobacteriosis was the most prevalent hepatic infection in Brazilian patients and culture of liver fragments is important for the diagnosis of opportunistic infection.
We would like to thank Maria de Fátima Beu for preparing the cultures of the hepatic fragments.
CONFLICT OF INTEREST
The authors declare that there is no conflict of interest.
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Dra. Graziella Hanna Pereira
Av. Jandira 79/231 Bloco A2, Moema
04080-000 São Paulo, SP.
Tel: 55 11 9915-8008/55 11 3170-6112
Received in 05/08/2009
Accepted in 09/12/2009