FcR gamma-chain is essential for both surface expression and function of human Fc gamma RI (CD64) in vivo

Most Ig receptors exist as hetero-oligomeric complexes with separate ligand binding (alpha) and signal transducing (beta, gamma, or zeta) subunits. For Fc gamma RIIIa and Fc epsilon RI, association with the FcR gamma-chain is essential for surface expression. However, the human high affinity IgG receptor, hFc gamma RI, was found to be surface- expressed by itself in transient transfection models. We have now analyzed the integrity of hFc gamma RI expression in more detail in stable transfectants. In vitro we noted that, in the absence of FcR gamma-chain, surface expression of hFc gamma RI rapidly declined to background levels, in both IIA1.6 B cells and NIH3T3 fibroblasts. The effect of FcR gamma-chain on hFc gamma RI surface expression in vivo was evaluated by using two newly generated transgenic mouse lines, selectively expressing hFc gamma RI on myeloid cells. These transgenic mice were crossed with FcR gamma-chain-deficient mice. Analysis of blood monocytes and peritoneal macrophages showed that surface expression of hFc gamma RI was reduced by approximately 80%. The remaining approximately 20% of receptors were still capable of binding IgG-opsonized RBC, suggesting FcR gamma-chain not to be critical for hFc gamma RI ligand-binding capacity. Importantly, however, hFc gamma RI signaling capacity was lost in FcR gamma-chain-deficient cells. No phagocytosis could be observed using either ligand sensitized (EA- IgG2a) or CD64-targeted erythrocytes (using a bispecific antibody) in both hFc gamma RI transgenic lines. This documents the FcR gamma-chain to be indispensable for both surface membrane expression and function of human Fc gamma RI in vivo.     

Thallium scintigraphy during dobutamine infusion: nonexercise-dependent screening test for coronary disease

Exercise thallium scintigraphy has proven to be a sensitive method for detecting coronary artery disease (CAD). However, early redistribution of thallium and inadequate exercise can reduce its sensitivity. In this study, dobutamine was infused in incremental doses (5, 10, 15, and 20 micrograms/kg/min) in 24 patients being evaluated for chest pain. Thallium scintigraphy was completed during the maximum dose of dobutamine tolerated and repeated 4 hours later. Significant CAD was present in 16 patients; the remaining eight had normal coronaries. Exercise ECG was obtained in 23 patients. During dobutamine thallium scintigraphy, reversible perfusion defects occurred in 15 of 16 CAD and in one of eight non-CAD patients, resulting in a sensitivity of 94% and a specificity of 87%. Exercise ECG had a sensitivity of 60% and a specificity of 63%. We conclude that: (1) dobutamine thallium scintigraphy appears to be a sensitive method for detecting significant CAD and provided a more sensitive screening test than exercise ECG; (2) dobutamine thallium scintigraphy is especially useful in patients who cannot exercise; and (3) because imaging occurs during dobutamine infusion, the problem of early redistribution may be mitigated.     

Investigating the relationship between formal and informal care: An application using panel data for people living together

There is limited evidence on the relationship between formal and informal care using panel data in a U.K. setting and focused specifically on people living together (co‐residents). Using all 18 waves of the British Household Panel Survey (1991–2009), we analyse the effect of informal care given by co‐residents on the use of formal home care and health care services more generally. To account for endogeneity, we estimate models using random effects instrumental variable regression using the number of daughters as a source of exogenous variation. We find that a 10% increase in the monthly provision of informal care hours decreases the probability of using home help (formal home care) by 1.02 percentage points (p < .05), equivalent to a 15.62% relative reduction. This effect was larger for home help provided by the state (β = ?.117) compared with non‐state home help (β = ?.044). These results provide evidence that significant increases in the supply of informal care would reduce the demand for home‐help provision.     

Preparedness for caregiving: A phenomenological study of the experiences of rural Australian family palliative carers

The care of people with life‐limiting illnesses is increasingly moving away from an acute setting into the community. Thus, the caregiver role is growing in significance and complexity. The importance of preparing and supporting family caregivers is well established; however, less is known about the impact of rurality on preparedness and how preparedness shapes the caregiving continuum including bereavement. The aim of this study, conducted in 2017, was to explore how bereaved rural family palliative carers described their preparedness for caregiving. Interpretative phenomenological analysis was employed following semi‐structured interviews with four women and six men (N = 10, aged 55–87 years). Participants were recruited voluntarily through past engagement with a Regional Specialist Palliative Care Consultancy Service in Australia. The experiences of caregivers illustrated a lack of preparedness for the role and were characterised by four major themes: Into the unknown, Into the battle, Into the void and Into the good. The unknown was associated with a lack of knowledge and skills, fear, prognostic communication, exclusion, emotional distress and grief experience. Battles were experienced in a number of ways: intrapsychically (existing within the mind), through role conflict and identity; interpersonally with the patient, clinician and family; and systematically (against health, financial and legal systems). The void was felt during isolation in caregiving, in relinquishing the role, in bereavement and in feeling abandoned by service providers. Positive experiences, such as being valued, included and connected to supports, and the fostering of closer relationships and deeper meaning, occurred less frequently but temporarily buffered against negative aspects. Implications from this study for policy and practice centre on the frequent, purposeful and genuine engagement of caregivers. Services and clinicians are encouraged to enhance communication practices, promote meaningful inclusion, address access issues and enhance support at role relinquishment.     

Video Self-Modeling for Individuals with Disabilities: A Best-Evidence,Single Case Meta-Analysis

Video-based modeling capitalizes on technology to increase the efficiency of modeling interventions for individuals with disabilities. Video self-modeling is a specific form of video-based modeling that utilizes the learner as the model to provide an opportunity for the learner to view him or herself as competent. This meta-analysis investigated the efficacy of video-self modeling using articles that met quality criteria with a focus on potential moderators of effect including participant characteristics, targeted outcomes, and implementation components. Results indicated strong effects for preschool and elementary aged participants with autism spectrum disorders, particularly when social-communicative and behavioral outcomes were addressed. In regards to implementation variables, significantly larger effect sizes were obtained when positive self-review was implemented as compared to feed forward. Additionally, video self-modeling implemented alone yielded stronger effects than video self-modeling implemented with programmed reinforcement or as part of a package. Gaps in the evidence are identified including limited evidence for the use of video self-modeling with older participants and participants with disabilities other than autism. Implications and suggestions for future research are discussed.     

Hepatitis C virus among blood donors: follow-up study

BACKGROUND: The exact significance of antibodies to hepatitis C virus (HCV) in blood donors remains unknown. Confirmatory tests of anti-HCV- reactive serum and HCV RNA by polymerase chain reaction (PCR) are used to refute a large proportion of false-positive results. STUDY DESIGN AND METHODS: Ninety-two blood donors who were anti-HCV reactive in a first-generation enzyme-linked immunosorbent assay (ELISA) were reevaluated 10 months later with a second-generation ELISA (ELISA-2) as well as with second-generation recombinant immunoblot assay (RIBA-2) and by PCR. RESULTS: Twenty-five (43.9%) of the 57 ELISA-2-positive donors were confirmed as positive by RIBA-2; of these, 84 percent were HCV RNA positive in PCR. Of the 57 who were still anti-HCV positive, 46 were followed up and tested again in the same manner 2 years after the first screening. At that time, the pattern was little changed: 94 percent of RIBA-2- and PCR-positive donors remained positive. Of RIBA-2- and PCR-positive blood donors, 62 percent had abnormal alanine aminotransferase levels in at least one of the three evaluations. Among the anti-HCV-positive donors confirmed by RIBA-2, 60 percent, versus 12.6 percent in the control group, had a significantly (p < 0.001) more frequent risk factor for HCV infection, due to parenteral exposure to blood. CONCLUSION: These data confirm a good correlation between RIBA-2 reactivity and the detection of HCV RNA in a population of anti-HCV- positive blood donors.     

Hippocampal synaptic transmission and LTP in vivo are intact following bilateral vestibular deafferentation in the rat

Numerous studies in animals and humans have shown that damage to the vestibular system in the inner ear results in spatial memory deficits, presumably because areas of the brain such as the hippocampus require vestibular input to accurately represent the spatial environment. Consistent with this hypothesis, studies in animals have demonstrated that complete bilateral vestibular deafferentation (BVD) causes a disruption of place cell firing as well as theta activity. The aim of this study was to investigate whether BVD in rats affects baseline field potentials (field excitatory postsynaptic potentials and population spikes) and long‐term potentiation (LTP) in CA1 and the dentate gyrus (DG) of awake freely moving rats up to 43 days post‐BVD and of anesthetized rats at 7 months post‐BVD. Compared to sham controls, BVD had no significant effect on either baseline field potentials or LTP in either condition. These results suggest that although BVD interferes with the encoding, consolidation, and/or retrieval of spatial memories and the function of place cells, these changes are not related to detectable in vivo decrements in basal synaptic transmission or LTP, at least in the investigated pathways. © 2009 Wiley‐Liss, Inc.     

Single-port-access (SPATM) cholecystectomy: a multi-institutional report of the first 297 cases

Background

An important aspect of a new surgical technique is whether it can be performed by other surgeons in other institutions. The authors report the first 297 cases in a multi-institutional and multinational review of laparoscopic cholecystectomy performed via a single portal of entry.

Methods

Data were collected retrospectively for the initial patients undergoing single-port cholecystectomy by 13 surgeons who performed these procedures in their institutions after training by the authors. The review included operative time, blood loss, incision length, length of hospital stay (LOS), necessary additional trocars, and other parameters important to cholecystectomy. A database of all the single-port-access (SPA) surgeries performed by the surgeons included demographic and procedural details, LOS, complications, and initial follow-up data.

Results

To date, 297 single-port cholecystectomies have been performed for a variety of diagnoses, primarily cholelithiasis. The average operative time was 71 min, and the average LOS was 1–2 days. The average blood loss was minimal. The use of additional port sites outside the umbilicus occurred in 34 of the cases. Of the 35 intraoperative cholangiograms performed, 34 were successful. No significant complications occurred except for seromas and minor postoperative wound infections. These results are comparable with those for standard multiport cholecystectomy. In addition, no access site hernias (ASH) occurred.

Conclusions

The findings demonstrate that SPA surgery is an alternative to multiport laparoscopy with fewer scars and better cosmesis. One factor affecting the rate for adoption of SPA surgery among other surgeons is the reproducibility of this new procedure. Although this study had insufficient data to determine fully the benefits of SPA surgery, the feasibility of this procedure with safe, acceptable results was demonstrated in this initial large series across multinational institutions.