Hepatitis A virus infections associated with clotting factor concentrate in the United States

BACKGROUND: Two cases of hepatitis A among persons exposed to the same lot of solvent/detergent-treated antihemophilic factor VIII concentrate were reported to a surveillance system. An investigation was conducted to find additional cases and determine the source of infection. STUDY DESIGN AND METHODS: A seroprevalence study was conducted among persons with exposure to the suspect lot for serologic evidence of recent infection with hepatitis A virus (HAV). RESULTS: Six cases of recent HAV infection were discovered: four of the patients had been infused with material from the suspect lot of factor VIII, and two had received infusions of factor IX concentrate made from plasma pools common to the suspect factor VIII lot. HAV was identified in one of the plasma pools, in the factor VIII product, and in serum or stool from two factor VIII recipients and one factor IX recipient. The genetics sequence of the virus in the plasma pool, the factor VIII lot, and the factor VIII recipients were identical, while that of the virus in the factor IX recipient differed by a single base. CONCLUSION: These data document the transmission of HAV by a factor VIII concentrate and implicate factor IX products manufactured from a common source-plasma pool.     

Prodromal Herpes Zoster Mimicking Odontalgia - A Diagnostic Challenge

Herpes zoster (shingles) is caused by reactivation of the latent varicella zoster virus which is present due to an earlier varicella infection (chicken-pox). Herpes Zoster is a less common and endemic disease than varicella, although factors causing reactivation are still not well known, but it occurs in older and/or immunocompromised individuals. Involvement of C3, T5, L1, L2 and first division of trigeminal nerve are the most frequently encountered whereas the involvement of second and third division of trigeminal nerve is rarely seen. During the prodromal stage, the only presenting symptom may be odontalgia, which may prove to be a diagnostic challenge for the dentist, since many diseases can cause orofacial pain, and the diagnosis must be properly established before final treatment. Here we present a case of herpes zoster involving the second division of trigeminal nerve masquerading as odontalgia. The difficulties in diagnosis and management are discussed.     

The emerging role of Rab GTPases in the pathogenesis of Parkinson's disease

The identification of pathogenic mutations in Ras analog in brain 39B (RAB39B) and Ras analog in brain 32 (RAB32) that cause Parkinson's disease (PD) has highlighted the emerging role of protein trafficking in disease pathogenesis. Ras analog in brain (Rab) Guanosine triphosphatase (GTPase) function as master regulators of membrane trafficking, including vesicle formation, movement along cytoskeletal networks, and membrane fusion. Recent studies have linked Rab GTPases with α‐synuclein, Leucine‐rich repeat kinase 2, and Vacuolar protein sorting 35, 3 key proteins in PD pathogenesis. In this review, we discuss the various RAB GTPases associated with PD, current progress in the research, and potential future directions. Investigations into the function of RAB GTPases will likely provide significant insight into the etiology of PD and identify novel therapeutic targets for a currently incurable disease. © 2018 International Parkinson and Movement Disorder Society     

雷酚内酯的结构修正

雷公藤别名黄藤,系卫矛科植物雷公藤(Tripterygium wilfordii Hook.f.)。其根有舒筋活血,祛风湿,消肿止痛的功效,多用于类风湿关节炎的治疗。根皮中含有生物碱、甙、萜以及其它成分,其中多种二萜内酯成分有抗肿瘤活性和免疫     

A real-time autoregressive spectrum analyzer for Doppler ultrasound signals

A system based on a digital signal processor and a microcomputer has been programmed to estimate the maximum entropy autoregressive (AR) power spectrum of ultrasonic Doppler shift signals and display the results in the form of a sonogram in real-time on a computer screen. The system, which is based on a TMS 320C25 digital signal processor chip, calculates spectra with 128 frequency components from 64 samples of the Doppler signal. The samples are collected at a programmable rate of up to 40.96 kHz, and the computation of each spectrum takes typically 3.2 ms. The feasibility of on-line AR spectral estimation makes this type of analysis an attractive alternative to the more conventional fast Fourier transform approach to the analysis of Doppler ultrasound signals.     

Sedation for Endoscopy

Abstract  In order to examine the investigators' clinical suspicion that Vietnamese patients were more sensitive to the sedative effects of midazolam than were Caucasians, the pharmacokinetics of a single, weight-adjusted intravenous dose of midazolam (0.05 mg/kg) were compared in a group of healthy Caucasian and Vietnamese male volunteers. The Vietnamese group ( n =8) had a significantly lower height, lean body mass and mean weight (59.8±5.5 vs 72.1±8.1 kg, respectively) compared with the Caucasian group ( n =8). No significant differences were found between the Vietnamese and Caucasian groups with regard to distribution half-life of midazolam (8.38±13.1 vs 1.49±0.63 min, respectively), elimination half-life (2.49±1.80 vs 1.48±0.66 h, respectively), clearance (4.93±1.31 vs 5.90±2.12 mL/min per kg, respectively), steady state volume of distribution (0.863±0.497 vs 0.530±0.132 L/kg, respectively) or percentage of unbound drug in plasma (4.89±0.74 vs 4.11±1.08, respectively). This suggests that dosage of midazolam in Vietnamese should be based on total body-weight. Two Vietnamese subjects who were brothers had marked elevation of distribution half-life and initial volume of distribution and lesser elevations in elimination half-life and volume of distribution at steady state. This suggests that the known subgroup of subjects who demonstrate dyshomogeneity in midazolam volume of distribution may be genetically determined.