MHB4 Comparison of Standard Gamble, Time Trade-Off, and Visual Analog Scale Scores for Hypothetical Stroke Health States Using a Computer-Based Program

The most frequently used techniques for conducting utility assessments are the Standard Gamble (SG), the Time Trade-Off (TTO), and the Visual Analog Scale (VAS).
OBJECTIVES: The objectives of this study were to compare scores obtained on the SG, TTO, and VAS for hypothetical stroke health states; to determine the effect of age and gender on utility scores; to identify any ceiling or floor effects, and to determine the presence of interviewer effects.
METHODS: Forty-nine PharmD students from the College of Pharmacy at the University of Iowa were selected as the sample, and utility assessments were conducted by two interviewers, for hypothetical stroke scenarios adapted from the Glasgow Outcomes Sale. The health states evaluated were Good Recovery, Moderate Disability, Severe Disability, and a Vegetative State. Two rounds of interviews were separated by a period of 4 months. Regresion analysis was used to identify the factors influencing utility scores.
RESULTS: Mean SG scores for the four health states were 82.2, 62.7, 26.3, and 3.3, respectively. TTO scores for the four health states were 79.9, 57.3, 24.6, and 2.9, respectively. However, VAS scores were found to be higher than both TTO and SG scores. Neither age nor gender were found to be statistically significant determinants of reported utility scores. Interviewer effects were found for one out of 12 assessments in round 1, while none were observed in round 2. Floor effects were observed for all three techniques for the vegetative state.
CONCLUSION: Further research using larger, more representative samples from the general population is required to establish the validity of computer-based programs for utility assessments.     

Adhesion of platelets to surface-bound fibrinogen under flow

After platelet activation, fibrinogen mediates platelet-platelet interactions leading to platelet aggregation. In addition, fibrinogen can also function as a cell adhesion molecule, providing a substratum for adhesion of platelets and endothelial cells. In this report, we studied the adhesion of platelets to surface-immobilized fibrinogen under flow in different shear rates. Heparinized whole blood containing mepacrine-labeled platelets was perfused for two minutes at various wall shear rates from 250 to 2,000 s-1 in a parallel plate flow chamber. The number of adherent fluorescent platelets was quantitated every 15 seconds with an epifluorescent videomicroscope and digital image processing system. When compared with platelet adhesion and aggregation seen on glass surfaces coated with type I bovine collagen, a significant increase in platelet adhesion was observed on immobilized fibrinogen up to wall shear rates of 800 s-1. The adherent platelets formed a single layer on fibrinogen-coated surfaces. Under identical conditions, no significant adhesion was observed on fibronectin- or vitronectin-coated surfaces. Although platelet adhesion to collagen was substantially inhibited by the platelet inhibitors prostaglandin E1 and theophylline, these inhibitors had no effect on platelet adhesion to fibrinogen. Platelets adhered to recombinant homodimeric wild-type (gamma 400-411) fibrinogen, but not to the recombinant homodimeric gamma' variant of fibrinogen. Platelet adhesion to recombinant fibrinogen with RGD to RGE mutations at positions alpha 95-97 and alpha 572-574 was similar to that with plasma-derived fibrinogen. These results show that platelets adhere to fibrinogen-coated surfaces under moderate wall shear rates, that the interaction is mediated by the fibrinogen 400-411 sequence at the carboxy-terminus of the gamma chain, and that the interaction is independent of platelet activation and the RGD sequences in the alpha chain.     

The development of cellular immunity to Epstein-Barr virus after allogeneic bone marrow transplantation

Epstein-Barr virus-induced lymphoproliferative disease (EBV-LPD) is a potentially lethal complication during the first 6 months after allogeneic bone marrow transplantation (BMT). To determine whether deficiencies of EBV-specific cellular immunity contribute to EBV-LPD susceptibility and distinguish patients at risk, we performed limiting dilution analysis to quantify anti-EBV cytotoxic T-lymphocyte precursor (CTLp) frequencies in 26 recipients of unmodified or T-cell-depleted (TCD) grafts from EBV-seropositive donors. At 3 months post-BMT (n = 26), only five patients had EBV CTLp frequencies in the range of seropositive normal controls, irrespective of the type of transplant administered. By 6 months post-BMT, 9 of 13 patients tested had EBV CTLp frequencies within the normal range. The time period in which these patients had deficient cellular immunity to EBV corresponds to the period in which we have observed EBV-LPD in most prior patients. One patient with a low EBV CTLp frequency at 4 months post-BMT developed an EBV-LPD. Within 2 weeks of receiving an infusion of donor peripheral blood mononuclear cells (PBMC) providing less than 1,200 EBV- specific cytotoxic T-cell precursors, populations of EBV-specific CTL in the circulation were restored to levels detected in normal seropositive adults. Concurrently, the patient achieved a regression of the EBV-LPD, which has been sustained without further therapy. These studies indicate that recipients of both unmodified and TCD marrow grafts have profound deficiencies of EBV-specific T cell-mediated immunity early posttransplant, and that the period of risk for EBV-LPD closely corresponds to this interval of severe deficiency. Treatment of one patient with EBV-LPD with marrow donor-derived PBMC induced a rapid expansion of EBV-specific cytotoxic T-cell populations that occurred contemporaneously with the clinical regression of disease.     

Plasmodium vivax: a cause of malnutrition in young children

We studied the aetiology of malnutrition in a cohort of 1511 children < 10 years old in Espiritu Santo, Vanuatu. Malnutrition was categorized using standard anthropometric criteria as: underweight [weight-for-age (WA) Z score < -2], wasting [weight-for-height (WH) Z < -2], or stunting [height-for-age (HA) Z < -2]. On multiple logistic regression analysis, the only factors significantly associated with wasting were age < 5 years [OR (95% CI) 1.8 (1.2-2.9), p = 0.01] and having suffered one or more episodes of clinical P. vivax malaria in the 6 months preceding nutritional assessment [OR 2.4 (1.3-4.4), p = 0.006]. The incidence of P. vivax infection was significantly higher during the 6 months preceding assessment in underweight vs. non-underweight children [incidence rate ratio (IRR) 2.6 (1.5-4.4), p < or = 0.0001). These groups had similar incidences of clinical P. falciparum infection during the same period [IRR 1.1 (0.57-2.1) p = 0.8] and of either species during the 6 months following assessment [IRR P. vivax 1.3 (0.9- 2.0) p = 0.2; IRR P. falciparum 1.3 (0.9-1.9) p = 0.2]. In these children, P. vivax malaria was a major predictor of acute malnutrition; P. falciparum was not. Wasting neither predisposed to nor protected against malaria of either species. Although P. vivax malaria is generally regarded as benign, it may produce considerable global mortality through malnutrition.      

对产前母体苯巴比妥给药以预防针对新生儿和胎儿溶血病的婴儿换血

胎儿和新生儿溶血病(HDFN)可导致严重的围产期疾病,包括高胆红素血症及其引起的核黄疸。血红素分子解离为胆红素并产生免疫介导的溶血。它与白蛋白结合后转运到肝细胞,再由尿苷二磷酸葡萄糖醛酸转移酶(UGT)酶家族作用而葡萄糖醛酸化。对于人类,这种代谢途径中主要的酶是胆红素-     

Multiple symptoms in patients with chronic obstructive pulmonary disease in Norway

This paper examines the prevalence of multiple symptoms and the relationships between future expectations and multiple symptoms in a cross‐sectional study of 100 patients with chronic obstructive pulmonary disease. A questionnaire was used to examine the patients’ symptoms of breathlessness, anxiety, depression, sleeplessness, fatigue, and pain, and their outlook for the future. All patients reported breathlessness, 64% anxiety, 69% depression, 28% sleeplessness, 72% fatigue, and 45% pain. Those with anxiety reported significant depression (P < 0.001), and those with fatigue reported significant depression (P = 0.004). Patients who reported pain also reported significant sleeplessness (P = 0.022). A negative outlook for the future was reported by 42% of patients who also reported significantly more anxiety, depression, sleeplessness, fatigue, and pain (P ≤ 0.049). Multiple symptoms are common in chronic obstructive pulmonary disease, and patients with a pessimistic view of the future reported more symptoms. Those with multiple symptoms and a negative outlook toward the future may benefit from interventions to help them achieve a more positive outlook for the future, which may relieve symptom burden.