RESUMEN
In the last few years, gamma hydroxybutyric acid (GHB) has been used increasingly as a party drug; this has led to a marked increase in the number of requests for professional help with the treatment of GHB addiction. Pharmaceutical GHB (sodium oxybate, the sodium-salt of GHB), registered for cataplexia in narcolepsy patients, is used off-label to treat the withdrawal symptoms associated with GHB addiction. Pharmaceutical GHB has a high sodium load. In this report we present the cases of two patients who developed symptomatic hypernatremia following treatment with pharmaceutical GHB and who thereafter needed intensive care for the severe withdrawal symptoms that they experienced.
Asunto(s)
Hipernatremia/inducido químicamente , Oxibato de Sodio/efectos adversos , Síndrome de Abstinencia a Sustancias/tratamiento farmacológico , Adulto , Femenino , Humanos , Masculino , Oxibato de Sodio/uso terapéuticoRESUMEN
Focal segmental glomerulosclerosis (FSGS) is one of the most common patterns of glomerular injury. FSGS can be caused by mutations in genes encoding proteins that play key roles in the function of the podocyte and glomerular basement membrane. In this case report we present a family with FSGS initially suspected to be Alport syndrome. Genetic analysis according to the Dutch guidelines of FSGS revealed a mutation in INF2.
Asunto(s)
ADN/análisis , Glomeruloesclerosis Focal y Segmentaria/genética , Proteínas de Microfilamentos/genética , Mutación , Nefritis Hereditaria/diagnóstico , Proteínas Nucleares/genética , Adolescente , Adulto , Niño , Análisis Mutacional de ADN , Diagnóstico Diferencial , Femenino , Forminas , Pruebas Genéticas , Glomeruloesclerosis Focal y Segmentaria/diagnóstico , Glomeruloesclerosis Focal y Segmentaria/metabolismo , Humanos , Masculino , Proteínas de Microfilamentos/metabolismo , Proteínas Nucleares/metabolismo , LinajeRESUMEN
Anaerobic Propionibacterium acnes and Staphylococcus saccharolyticus are frequently isolated during platelet screening with anaerobic culture methods. Although neither P. acnes nor S. saccharolyticus proliferates during platelet storage, both species survive well in this environment. This study was aimed at determining whether strains of P. acnes and/or S. saccharolyticus form surface-attached bacterial cell aggregates, known as biofilms, under platelet storage conditions. We report that these organisms are able to adhere to the inner surface of platelet containers in tight interaction with activated platelets.
Asunto(s)
Biopelículas , Plaquetas/microbiología , Propionibacterium acnes/fisiología , Staphylococcus/fisiología , Adhesión Bacteriana , Seguridad de la Sangre , HumanosRESUMEN
BACKGROUND: Bacterial contamination of platelet concentrates (PCs) still remains a significant problem in transfusion with potential important clinical consequences, including death. The International Society of Blood Transfusion Working Party on Transfusion-Transmitted Infectious Diseases, Subgroup on Bacteria, organised an international study on Transfusion-Relevant Bacteria References to be used as a tool for development, validation and comparison of both bacterial screening and pathogen reduction methods. MATERIAL AND METHODS: Four Bacteria References (Staphylococcus epidermidis PEI-B-06, Streptococcus pyogenes PEI-B-20, Klebsiella pneumoniae PEI-B-08 and Escherichia coli PEI-B-19) were selected regarding their ability to proliferate to high counts in PCs and distributed anonymised to 14 laboratories in 10 countries for identification, enumeration and bacterial proliferation in PCs after low spiking (0·3 and 0·03 CFU/ml), to simulate contamination occurring during blood donation. RESULTS: Bacteria References were correctly identified in 98% of all 52 identifications. S. pyogenes and E. coli grew in PCs in 11 out of 12 laboratories, and K. pneumoniae and S. epidermidis replicated in all participating laboratories. The results of bacterial counts were very consistent between laboratories: the 95% confidence intervals were for S. epidermidis: 1·19-1·32 × 10(7) CFU/ml, S. pyogenes: 0·58-0·69 × 10(7) CFU/ml, K. pneumoniae: 18·71-20·26 × 10(7) CFU/ml and E. coli: 1·78-2·10 × 10(7) CFU/ml. CONCLUSION: The study was undertaken as a proof of principle with the aim to demonstrate (i) the quality, stability and suitability of the bacterial strains for low-titre spiking of blood components, (ii) the property of donor-independent proliferation in PCs, and (iii) their suitability for worldwide shipping of deep frozen, blinded pathogenic bacteria. These aims were successfully fulfilled. The WHO Expert Committee Biological Standardisation has approved the adoption of these four bacteria strains as the first Repository for Transfusion-Relevant Bacteria Reference Strains and, additionally, endorsed as a project the addition of six further bacteria strain preparations suitable for control of platelet contamination as the next step of enlargement of the repository.
Asunto(s)
Plaquetas/microbiología , Transfusión Sanguínea , Infecciones Bacterianas/prevención & control , Técnicas de Tipificación Bacteriana/métodos , Técnicas Bacteriológicas , Bancos de Muestras Biológicas , Transfusión de Componentes Sanguíneos/métodos , Plaquetas/citología , Escherichia coli/metabolismo , Humanos , Cooperación Internacional , Klebsiella pneumoniae/metabolismo , Garantía de la Calidad de Atención de Salud/métodos , Reproducibilidad de los Resultados , Staphylococcus epidermidis/metabolismo , Streptococcus pyogenes/metabolismoRESUMEN
Immunotactoid glomerulopathy (ITG ) is a rare cause of nephrotic syndrome, occurring in approximately 0.1% of native kidney biopsies. We describe a 43-year-old woman who presented with a nephrotic syndrome. Renal biopsy revealed a membranous pattern of glomerular injury. In electron microscopy the subepithelial deposits were comprised of 40 nm wide tubular structures, confirming ITG . During follow-up the patient developed a remission of proteinuria with only supportive treatment.
Asunto(s)
Glomerulonefritis/patología , Glomérulos Renales/ultraestructura , Microscopía Electrónica , Síndrome Nefrótico/patología , Adulto , Diagnóstico Diferencial , Femenino , Glomerulonefritis/complicaciones , Glomerulonefritis/terapia , Glomerulonefritis Membranosa/diagnóstico , Humanos , Nefrosis Lipoidea/diagnóstico , Síndrome Nefrótico/etiología , Síndrome Nefrótico/terapia , Remisión EspontáneaRESUMEN
A real-time PCR assay based on the 16S rRNA gene was optimized for the detection of a broad range of bacteria in plasma and platelet concentrates (PC). A lambda phage internal control was constructed and implemented in the assay, which made it suitable for diagnostic use. Spiking studies in plasma and PCs were performed to determine the analytical sensitivity of the assay. Thirty three colony forming units (CFU)/ml of E. coli and 72 CFU/ml of Staphylococcus epidermidis could be detected in plasma, and 97 CFU/ml of S. epidermidis in PCs. The assay detected all bacteria relevant for bacterial contamination of PCs. The short turn around time of the assay made it suitable for testing PCs for bacterial contamination prior to transfusion.
Asunto(s)
Bacterias/aislamiento & purificación , Plaquetas/microbiología , Plasma/microbiología , Reacción en Cadena de la Polimerasa/métodos , Reacción en Cadena de la Polimerasa/normas , Bacterias/genética , Bacteriófago lambda/genética , Transfusión Sanguínea/normas , ADN Bacteriano/genética , ADN Ribosómico/genética , Humanos , ARN Ribosómico 16S/genética , Estándares de Referencia , Sensibilidad y EspecificidadRESUMEN
BACKGROUND AND OBJECTIVES: Parvovirus B19 (B19V) DNA screening has been introduced to comply with European regulations for certain plasma products. Current commercial and some in-house B19V DNA assays fail to detect or under-quantify the recently identified genotypes 2 and 3. In this report, we describe 2-year experience with B19V DNA screening using the commercial assay from Roche (detecting only genotype 1) combined with an in-house assay (detecting genotypes 1, 2 and 3). This dual testing approach enables the identification of molecular variants of B19V. MATERIALS AND METHODS: Between 2005 and 2007, approximately 2.6 million plasma donations were screened for B19V DNA loads exceeding 10(6) IU/ml using the Roche and the in-house real-time polymerase chain reaction assay. RESULTS: A total of 232 plasma units were identified with B19V DNA loads above 10(6) IU/ml. Concordant results were observed for the majority of B19V positive samples; however, three of these showed discrepant results between the two assay systems. One was a B19V genotype 2 strain not detected by the Roche assay; another was a B19V genotype 1 strain with a mismatch in the 3'-end of the reverse primer and therefore under-quantified by the Roche assay; and the third one was also a B19V genotype 1 strain that gave an unusual amplification plot in the in-house assay due to a mismatch in the probe-binding site. CONCLUSIONS: New, high viral load, B19V genotypes 2 and 3 infections are rare in blood donors tested by Sanquin. One case was found while testing 2.6 million donations. The prevalence of B19V genotype 1 variants not detected by commercial or in-house assays might be in the same range or even higher than the prevalence of B19V genotype 2 viruses, which remain undetected.
Asunto(s)
Infecciones por Parvoviridae/genética , Parvovirus B19 Humano/genética , Reacción en Cadena de la Polimerasa/métodos , Donantes de Sangre , Genotipo , Humanos , Tamizaje Masivo , Datos de Secuencia Molecular , Países Bajos , Técnicas de Amplificación de Ácido Nucleico/métodos , Parvovirus B19 Humano/clasificación , Filogenia , Carga ViralRESUMEN
Human embryonic fibroblasts with a large deletion (11p11.11p15.1) in the short arm of one chromosome 11 (del-11 cells) appeared to be susceptible to transformation by early human papillomavirus type 16 (HPV-16) DNA, whereas diploid human embryonic fibroblasts were not. This difference in susceptibility might be explained by the absence of a tumor suppressor gene located within the deleted part on the short arm of chromosome 11. The presence of abundant viral early-gene transcripts in transformed cells suggests that transformation was induced by an elevated level of an HPV-16 early-gene product(s). The low transcriptional activity of HPV-16 in diploid cells may indicate that cellular genes affect viral transcription. Interruption of the HPV-16 E2 early open reading frame is probably required for high-level HPV-16 early-gene expression driven from the homologous enhancer-promoter region.