Background: Despite improvement in hepatitis B infection prevention through national vaccination programs, implementation of compulsory and thorough blood donor screening, and reduction of transfusion numbers due to erythropoietin administration, hepatitis B remains a major concern in hemodialysis (HD) centers (1). Compared to a response rate of over 90% in the normal population, only 50 to 60% of those with endstage renal disease (ESRD) achieve protective antibody levels following immunization against hepatitis B (2, 3). Various strategies have been developed to overcome the low seroconversion rate in ESRD patients, including co-administering zinc, gamma-interferon, thymopentin, interleukin-2, and levamisole as immunostimulants or adjuvants (3, 4), changing the injection mode (intradermal versus intramuscular), or doubling the vaccine dose (5). Objectives: Previous studies demonstrated that renal failure patients benefit from HBV vaccination; however, not all studies have demonstrated this. Therefore, we compared the rates of seroconversion (hepatitis B surface antibody [HBsAb] titer > 10 IU/mL) in patients at various stages of chronic kidney disease (CKD) (estimated glomerular filtration rate [eGFR] < 60 mL/min/1.73 m2) who received HBV vaccination. Patients and Methods: A total of 167 patients in 3 different stages of CKD were vaccinated against HBV. Each patient received the vaccine according to a standardized vaccination schedule consisting of 40 μg of the recombinant vaccine "Engerix" at 0, 1, and 6 months. Eight to 12 weeks after the last dose of vaccination, anti-HBsAb levels were measured. Results: Mean age and eGFR were 57.4 ± 16.5 years and 26.7 ± 14.7 mL/min/1.73 m2, respectively. The overall seroconversion rate was 78%. Although a significant correlation between HBsAb titer and eGFR (r = 0.265, P = 0.001) was observed, in the multivariate analysis using age, CKD stage, diabetes mellitus, and gender as independent variables, the degree of renal function did not significantly contribute to seroconversion. In contrast, higher age (> 60 years) showed a significant negative correlation to seroconversion (odds ratio = 0.22; P = 0.004). Conclousions: CKD patients of advanced age should be vaccinated against HBV. Although higher eGFR was not associated with improved seroconversion, the persistence of seroconversion was not evaluated; future studies should be conducted to develop recommendations for earlier or later vaccination.

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Subcutaneous injection of diluted formalin (0.25 microliter of 0.5%) caused a biphasic pain response in mice. The first phase of pain was observed during the first 5 min., while the second phase occurred 10-30 min. after formalin administration. With the formalin test, it was found that the antinociception produced by the GABA-A antagonist, picrotoxin, and the GABA-B antagonist, phaclofen, was abolished when employed in combination. The opioid antagonist naloxone and antimuscarinic atropine also decreased the picrotoxin response. However, sulpiride, SCH 23390, phenoxybenzamine and propranolol did not alter the picrotoxin response. Administration of naloxone, sulpiride and propranolol showed a pain response. The data indicate that dopaminergic and adrenergic mechanisms may not be involved in the picrotoxin antinociceptive effect. However, postsynaptic GABA-A and GABA-B may be involved in the drug effect, and involvement of opioid or cholinergic systems can not be excluded.

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BackgroundDespite improvement in hepatitis B infection prevention through national vaccination programs, implementation of compulsory and thorough blood donor screening, and reduction of transfusion numbers due to erythropoietin administration,hepatitis B remains a major concern in hemodialysis (HD) centers [1]. Compared to aresponse rate of over 90% in the normal population, only 50 to 60% of those with endstage renal disease (ESRD) achieve protective antibody levels following immunization against hepatitis B [2][3]. Various strategies have been developed to overcome the low seroconversion rate in ESRD patients, including co-administering zinc, gamma-interferon,thymopentin, interleukin-2, and levamisole as immunostimulants or adjuvants [3][4],changing the injection mode (intradermal versus intramuscular), or doubling the vaccine dose [5].ObjectivesPrevious studies demonstrated that renal failure patients benefit from HBV vaccination; however, not all studies have demonstrated this. Therefore, we compared the rates of seroconversion (hepatitis B surface antibody [HBsAb] titer > 10 IU/mL) in patients at various stages of chronic kidney disease (CKD) (estimated glomerular filtration rate [eGFR] < 60 mL/min/1.73 m2) who received HBV vaccination.Patients and MethodsA total of 167 patients in 3 different stages of CKD were vaccinated against HBV. Each patient received the vaccine according to a standardized vaccination schedule consisting of 40 μg of the recombinant vaccine “Engerix” at 0, 1, and 6 months.Eight to 12 weeks after the last dose of vaccination, anti-HBsAb levels were measured.ResultsMean age and eGFR were 57.4 ± 16.5 years and 26.7 ± 14.7 mL/min/1.73 m2, respectively.The overall seroconversion rate was 78%. Although a significant correlation between HBsAb titer and eGFR (r = 0.265, P = 0.001) was observed, in the multivariate analysis using age, CKD stage, diabetes mellitus, and gender as independent variables,the degree of renal function did not significantly contribute to seroconversion. In contrast,higher age (> 60 years) showed a significant negative correlation to seroconversion (odds ratio = 0.22; P = 0.004).ConclousionsCKD patients of advanced age should be vaccinated against HBV. Although higher eGFR was not associated with improved seroconversion, the persistence of seroconversion was not evaluated; future studies should be conducted to develop recommendations for earlier or later vaccination.

We develop spectral methods for ODEs and operator eigenvalue problems that are based on a least-squares formulation of the problem. The key tool is a method for rectangular generalized eigenvalue problems, which we extend to quasimatrices and objects combining quasimatrices and matrices. The strength of the approach is its flexibility that lies in the quasimatrix formulation allowing the basis functions to be chosen arbitrarily (e.g. those obtained by solving nearby problems), and often giving high accuracy. We also show how our algorithm can easily be modified to solve problems with eigenvalue-dependent boundary conditions, and discuss reformulations as an integral equation, which often improves the accuracy.

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