Diagnóstico de infección por VIH por el hallazgo incidental de alteraciones ultraestructurales en una biopsia renal: Report of one case / Ultrastructural alterations in renal biopsy leading to the diagnosis of HIV infection

HIV infection has different clinical presentations. We report a 21-year-old male with longstanding isolated microscopic hematuria attributed to thin glomerular basement membrane disease, who after 15 years of follow-up presented with significant proteinuria. A kidney biopsy was performed, revealing the presence of tubulo-reticular inclusions in the glomerular endothelial cells. This finding led to suspect an HIV infection, which was verified. Antiretroviral therapy, angiotensin-converting enzyme and angiotensin II receptor blockers were prescribed. At 6 years of diagnosis the patient is asymptomatic and has normal kidney function. Microscopic hematuria and low level proteinuria persists.

Urine alpha1-microglobulin is a better marker for early tubular dysfunction than beta2-microglobulin among tenofovir-exposed human immunodeficiency virus-infected men who have sex with men

Objectives: Men who have sex with men are at risk of tenofovir nephrotoxicity due to its wide use in both treatment and prophylaxis for human immunodeficiency virus infection, but little is known about the urinary biomarkers of early renal dysfunction in this population. This study aims to identify useful biomarkers of early renal dysfunction among human immunodeficiency virus-infected men who have sex with men exposed to tenofovir.Methods: In a cross-sectional study urinary alpha1-microglobulin, beta2-microglobulin, N-acetyl-B-n-glucosaminidase and albumin were measured and expressed as the ratio-to-creatinine in 239 human immunodeficiency virus-infected men who have sex with men who were treatment naïve or receiving antiretroviral therapy with tenofovir-containing or non-tenofovir-containing regimens. Additionally, 56 patients in the non-antiretroviral therapy group started a tenofovir-containing regimen and were assessed after 3 and 6 months on antiretroviral therapy.Results: Both the frequency of alpha1-microglobulin proteinuria (alpha1-microglobulin-creatinine ratio >25.8 mg/g) and the median urinary alpha1-microglobulin-creatinine ratio were higher in the tenofovir disoproxil fumarate group than the other two groups (all p< 0.05). A higher frequency of beta2-microglobulin proteinuria (beta2-microglobulin-creatinine ratio >0.68 mg/g) was also observed in the tenofovir group (28.9%) compared to the non-tenofovir group (13.6%, p= 0.024). There were no significant differences between groups for N-acetyl-β-n-glucosaminidase and albumin. In the longitudinal study, the median urinary alphat-microglobulin-creatinine ratio after 3 and 6 months on tenofovir-containing therapy (16.8 and 17.3 mg/g) was higher than baseline (12.3 mg/g, p= 0.023 and 0.011, respectively), while no statistically important changes were observed in urinary beta2-microglobulin-creatinine ratio or in the other biomarkers after 3 and 6 months on antiretroviral therapy (all p> 0.05).Conclusion: Urinary alphat-microglobulin seems to be a more sensitive and stable indicator of tubular dysfunction than urinary beta2-microglobulin for assessing tenofovir-related nephrotoxicity and can be significantly altered after tenofovir exposure.

Fatores de risco associados a alterações renais em pacientes infectados por HIV-1 / Risk factors related to renal disorders in HIV-1 infected patients

INTRODUÇÃO: A doença renal é uma das principais comorbidades envolvendo pacientes infectados com o HIV, em razão da melhora da sobrevida proporcionada pela terapêutica antirretroviral. O objetivo deste estudo foi detectar fatores de risco, possivelmente correlacionados com função renal alterada, em pacientes infectados pelo HIV. MÉTODOS: Estudo transversal foi realizado em 254 pacientes infectados pelo HIV, atendidos em ambulatório na Santa Casa de Vitória. Eles foram entrevistados e submetidos a coletas de amostras de sangue para contagem de células CD4, quantificação de carga viral do HIV-1, dosagens de glicose, lipídeos e creatinina. A proteinúria foi avaliada em amostra de primeira urina da manhã. A filtração glomerular foi estimada com as fórmulas de modified diet in renal disease (MDRD) simplificada e Cockcroft-Gault. RESULTADOS: Cento e três (40,6 por cento) pacientes tinham alguma anormalidade no exame de urina, sendo proteinúria o achado mais comum (46; 18,1 por cento pacientes). Vinte e cinco (9,8 por cento) pacientes tinham filtração glomerular estimada inferior a 60ml/min/1.73m² de acordo com MDRD. A análise de regressão logística multivariada mostrou que baixa filtração glomerular foi positivamente correlacionada com raça negra [OR 9,6 (IC95 por cento 1,28-23,80)], hipertensão arterial sistêmica [OR 3,3 (IC95 por cento 1,28-23,81)], idade acima de 51 anos [OR 3,3 (IC95 por cento1,11-9,90)], proteinúria [OR 5,2 {IC95 por cento 1,67-16,25}]; hematúria [OR 3,2 (1,12-9,29)] e negativamente com pacientes em uso de zidovudina [OR 0,2 (0,04-0,78)]. CONCLUSÕES: Os fatores de risco tradicionais para doença renal como raça negra, hipertensão arterial e idade avançada foram correlacionados com menor filtração glomerular estimada em nossos pacientes.

INTRODUCTION: Renal disease has emerged as one of the primary comorbid conditions affecting HIV-infected patients, mainly because antiretroviral therapy has improved survival. This study aimed to detect risk factors possibly associated with altered renal function in HIV-infected patients. METHODS: A cross-sectional study was conducted involving 254 HIV-infected patients attending an outpatient clinic at Santa Casa de Vitoria< They were interviewed and blood samples were collected for CD4 cell counts, HIV-1 viral load, glucose, lipids and creatinine measurements. Urine protein was evaluated in the first voiding urine sample. Glomerular filtration was estimated by simplified modified diet in renal disease (MDRD) and Cockcroft-Gault formulas. RESULTS: One hundred and three (40.6 percent) patients presented some urinary abnormality, and proteinuria was the most common finding (46; 18.1 percent patients). Twenty-five (9.8 percent) patients showed estimated glomerular filtration below 60ml/min/1.73m² by MDRD. Multivariate logistic regression showed that low glomerular filtration was positively correlated with black race [OR 9.6 (IC95 percent 1.28-23.80)], arterial hypertension [OR 3.3 (IC95 percent 1.28-23.81)], age over fifty-one years-old [OR 3.3 (IC95 percent1.11-9.90)], proteinuria [OR 5.2 {IC95 percent 1.67-16.25}]; hematuria [OR 3.2 (1.12-9.29)] and negatively correlated with patients using zidovudine [OR 0.2 (0.04-0.78)]. CONCLUSIONS: Traditional risk factors for renal disease, such as black race, arterial hypertension and advancing age were correlated with low estimated glomerular filtration in the present patient sample.

Compromiso renal e infección por VIH/SIDA en pacientes atendidos en un hospital pediátrico chileno / Renal compromise in HIV/AIDS in patients attended at a Chilean children hospital

The aim of this study was to determine the frequency of renal abnormalities in HIV positive children hospitalized in one pediatric hospital in Chile. Method: a cross sectional study was performed during April 2007. Results: A total of 18 patients were evaluated, ten male and eight female ranging in age from 4 to 19 years. The average age at the time of HIV diagnosis and nephrologic evaluations were 2,69 and 10,7 years respectively. All patients had acquired HIV infection by vertical transmission. Uriñe samples of two children had microalbuminuria; two had monosymptomatic hematuria, and ten had ¿squamous? cells. Hypercalciuria was detected in one patient, renal lithiasis in another and two patients had abnormal renal ultrasonography. All 19 patients had normal blood pressures. Overall 7 patients (39 percent) had a renal abnormality. Conclusions: The relatively high incidence of renal abnormalities in our series support the need for a nation-wide screening program to assess the incidence of renal impairment in pediatric HIV positive patients.

El objetivo de este estudio fue evaluar la función renal de pacientes infectados con virus de inmuno-deficiencia humana (VIH) que se controlan en un hospital pediátrico chileno. Método: estudio de corte transversal. Resultados: Se evaluaron 18 pacientes, 10 varones y 8 mujeres; edad: entre 4 y 19 años, la edad promedio al diagnóstico de la infección por VIH y al momento de la evaluación fue 2,69 y 10,7 años, respectivamente. Todos nuestros pacientes adquirieron la infección vía vertical. Dos presentaron microalbuminuria y dos hematuria monosintomática. En 10 (55 por ciento) se encontraron células descamativas, en uno hiper-calciuria y en otro litiasis renal. Todos tuvieron presión arterial normal. La ecotomograña renal fue anormal en dos. Se han descrito varias anormalidades renales en pacientes con infección por VIH; en nuestro estudio, 7 pacientes (39 por ciento) tuvieron alteraciones en los exámenes de laboratorio. Conclusión: La alta frecuencia de afectación renal encontrada en pacientes pediátricos con infección por VIH hace necesario plantear un tamizaje nacional para determinar la incidencia de nefropatía asociada en nuestros pacientes.

Prevalence of persistent proteinuria in stable HIV/AIDS patients and its association with HIV nephropathy

Human immunodeficiency virus (HIV)-related glomerular disease is a cause of end-stage renal disease, though there is no recent data from Brazil concerning this syndrome. Persistent proteinuria (PPt) is the main marker for glomerular disease, especially levels above 1.5 g. We examined the prevalence of and associated risk factors for PPt, along with the prevalence of HIV-associated nephropathy (HIVAN) among AIDS patients. We interviewed 411 patients who were attended at the HIV/AIDS section of the Clinical Hospital of the Federal University of Pernambuco (Brazil) from January through June 2004. PPt was defined as a positive urine dipstick exam on at least two occasions. The analyzed risk factors were: black race, a low CD4 lymphocyte count (<200 cells/mm³), an HIV RNA level of >100,000 copis/mL and patients on highly-active antiretroviral therapy (HAART). The patients were classified according to urineary protein/creatinine ratio (Up/Uc) < 1.0, 1.0-3.0 and > 3.0. Patients with Up/Uc >3.0 were submitted to renal biopsy. Among the 411 HIV/AIDS patients, the mean age was 37 years, 70 percent were male, 37.5 percent were black, the mean CD4 count was 363 cells/mm³ (± 95), the mean RNA HIV count was 44,475 copies/mL (± 40,369), and 92 percent were on HAART. The prevalence of PPt was 5.6 percent (95 percent CI = 3.6 to 8.3 percent), and it was significantly associated with a low CD4 lymphocyte count (p<0.048). HIVAN was found in just one patient, and two patients improved after HAART.

Response of HIV-associated proteinuria to antiretroviral therapy in HIV-1-infected children

HIV-associated nephropathy has been found in children with HIV-1 infection as a late manifestation of this disease; it is associated with nephrotic syndrome with focal segmental glomerulosclerosis and/or mesangial hyperplasia with microcystic tubular dilatation. This is quite rare in children and no cases have been reported from India. Several mechanisms have been hypothesized for the HIV-induced renal damage. We report on two HIV-infected children with HIV-associated proteinuria and dramatic response to antiretroviral therapy.

Glomerulopatía colapsante: Una nueva entidad asociada a síndrome nefrótico e insuficiencia renal terminal / Collapsing glomerulopathy: a new entity associated to nephrotic syndrome and chronic renal failure

La glomerulopatía colapsante (GC) es una forma agresiva de daño glomerular definida por los datos histológicos de colapso de los capilares glomerulares, lesión de las células epiteliales viscerales y daño tubulointersticial característico. Los pacientes con glomerulopatía colapsante presentan datos clínicos que consisten en síndrome nefrótico grave, generalmente con proteinuria mayor de 10 g/24 horas, y progresión rápida a insuficiencia renal terminal o a la muerte por complicaciones del síndrome nefrótico, a pesar de cualquier forma de tratamiento. La GC, afecta a personas de cualquier sexo con ligera predominancia en el sexo masculino y en personas jóvenes. Se puede presentar como recidiva o de novo en el injerto renal. En algunos países predomina en la raza negra como sucede con las enfermedades renales en general. La GC comparte algunos datos clínicos e histológicos con la esclerosis focal y segmentaria recidivante y la nefropatía asociada al VIH, por lo que ha habido cierta controversia cerca de que se trate de una variante de estas enfermedades. Existe, sin embargo, evidencia clinicopatológica suficiente para separarla como una entidad diferente, aunque es posible que la esclerosis focal y segmentaria recidivante, la nefropatía asociada al SIDA y la glomerulopatía colapsante compartan un mecanismo fisiopatogénico común

Compromiso renal en el síndorme de inmunodeficiencia adquirida (SIDA)

Se estudió la función renal en 65 pacientes con SIDA, los factores de riesgo fueron homosexualidad (83 por ciento), transfusión (6.1 por ciento), drogadicción intravenosa (1.5 por ciento) desconocido (9.2 por ciento). En 12 pacientes se practicó biopsia renal percutánea realizándose microscopía de luz (ML) e inmunofluorescencia (IF); se revisó la ML de los cortes de riñon de siete autopsias. La depuración de creatinina osciló entre 48 y 100 ml/min. El 50 por ciento de los pacientes presentó proteinuria inferior a 800 mg en 24 horas, ningún paciente presentó síndrome nefrótico. Los hallazgos en el sedimento urinario fueron hematuria, cilindruria, leucocituria y bacteriuria. la biopsia renal fue normal en 50 por ciento de los casos; se encontró proliferación mesangial en 33 por ciento, esclerosis gomerular en 8 por ciento y nefritis tubulointersticial en 8 por ciento. La IF mostró IgG en el 75 por ciento de las biopsias, fibrinógeno en el 8 por ciento; fue negativa para IgA, IgM y C3. Las autopsias mostrarón proliferación mesangial en 42 por ciento de los casos, nefritis tubulointersticial en 28 por ciento, infección por citomegalovirus en 28 por ciento, por criptococo en 28 por ciento y melanoma metastásico en 14 por ciento de los especímenes