Red blood cell transfusion-transmitted acute hepatitis E in an immunocompetent subject in Europe: a case report.

BACKGROUND: Acute hepatitis E in industrialized countries is usually related to intake or manipulation of undercooked or raw meat. Cases of transfusion-transmitted hepatitis E have rarely been documented in immunosuppressed patients, mainly after receiving frozen plasma. STUDY DESIGN AND METHODS: A 61-year-old man was admitted to hospital for jaundice. His personal history included disseminated bacillus Calmette-Guerin infection treated with antituberculous drugs. He had received red blood cell (RBC) transfusion 2 months previously, during admission for mycotic aneurysm surgery. Since liver function tests worsened despite stopping antituberculous drugs, other causes of acute hepatitis were explored. RESULTS: Acute hepatitis E was diagnosed by the presence of both immunoglobulin M and hepatitis E virus (HEV) RNA. Traceback procedure for the 8 RBC units was carried out, and one of the eight archive plasma samples tested positive for HEV RNA, with an estimated viral load of 75,000 IU/mL. Phylogenetic analysis revealed the same HEV strain Genotype 3 in one of the transfused RBC products and in the patient's serum sample. CONCLUSION: Transfusion of RBCs with detectable HEV RNA is a risk factor for acute hepatitis E in immunocompetent patients in Europe.

Fucoidan interferes with Porphyromonas gingivalis-induced aneurysm enlargement by decreasing neutrophil activation.

PURPOSE: Neutrophils have been shown to be involved in all stages of human and experimental abdominal aortic aneurysm (AAA) development. The initial processes of neutrophil rolling and trapping in the intraluminal thrombus (ILT) are mediated mainly by P-selectin expressed by activated platelets. In the present study, we propose to evaluate the beneficial effect of fucoidan, a competitive binding agent of P-selectin, on aneurysmal growth in a rat model of aortic aneurysm with neutrophil enrichment of the ILT induced by repeated episodes of weak bacteremia. METHODS: Sixty Lewis rats with experimental AAAs, developed from decellularized aortic xenografts, were divided into four groups. Two groups were used as controls: group fucoidan control (FC) was treated with 200 mg of fucoidan (F) delivered by 2 mL, 4-week osmotic pumps placed intraperitoneally before closing the abdomen, and group C received saline instead of fucoidan. Two more groups were injected weekly with Porphyromonas gingivalis (P. gingivalis [Pg]): group F+Pg received 200 mg of intraperitoneal fucoidan and group Pg received saline. AAAs were harvested after 4 weeks and peripheral blood was sampled at that time. Cell-free DNA (cf-DNA) and myeloperoxydase (MPO) antigen concentrations were determined in plasma and in AAA-conditioned media. Histology and P-selectin immunostaining were performed on AAA tissue samples. RESULTS: Comparing rats injected with Pg, those receiving fucoidan presented reduced aneurysmal diameter. Histologic analysis of AAAs showed that fucoidan reduced the ILT thickness in Pg-injected rats, with fewer trapped neutrophils, and with signs of a healing process, as observed in control group C. Immunohistological analysis revealed a substantial decrease in P-selectin immunostaining at the luminal surface of aneurysms in fucoidan-treated rats compared to the other groups, suggesting an interaction between fucoidan and P-selectin. A significant decrease in MPO concentrations in both plasma and conditioned medium was induced by fucoidan treatment in Pg-injected rats, reflecting a pacification of the ILT biological activity. This effect was associated with a reduction in neutrophil activation and apoptosis, reflected by a significant decrease in cf-DNA concentration in both plasma and conditioned medium of fucoidan-treated rats. CONCLUSIONS: Our results suggest that fucoidan has a beneficial effect on experimental aneurysmal degeneration by decreasing neutrophil activation in the ILT enhanced by weak pathogen contamination. This effect seems to be related to its interaction with P-selectin, which may decrease the trapping of neutrophils into the ILT. Fucoidan could represent a therapeutic option in AAAs to decrease the neutrophil activation involved in the degenerative process of aneurysmal expansion and rupture.

Rotura de aneurisma poplíteo micótico tras sepsis por neumonía / Ruptured mycotic popliteal artery aneurysm after sepsis due to pneumonia

No disponible

Failure of treatment with teicoplanin at 6 milligrams/kilogram/day in patients with Staphylococcus aureus intravascular infection. The Infectious Diseases Consortium of Oregon.

Patients with blood cultures positive for gram-positive cocci were enrolled in a prospective randomized double-blind comparative trial of vancomycin at 15 mg/kg every 12 h versus teicoplanin at 6 mg/kg every 12 h for three doses and then 6 mg/kg every 24 h. A total of 54 patients were randomized, and 40 were evaluable. Of the 40, 9 had infection of indwelling vascular catheters. Four infections were due to Staphylococcus aureus, and five were due to Staphylococcus epidermidis. In concert with catheter removal, all patients were treated successfully, regardless of which drug they were taking. Of 31 patients without an indwelling catheter, 19 were infected with S. aureus, and 12 of the 19 had either endocarditis or mycotic aneurysm. Six of eight patients given teicoplanin failed treatment, as opposed to one of four patients given vancomycin (P = 0.14). Of greater concern, four of four patients with left-sided endocarditis or mycotic aneurysm failed to recover when given teicoplanin, as opposed to one of three patients given vancomycin (P = 0.07). Although not quite statistically significant, the unexpectedly high number of treatment failures with teicoplanin resulted in a decision to discontinue patient enrollment. It is suggested that future trials explore the efficacy of larger doses of teicoplanin.