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Biomedical subjects

S Larson

Publications and source records attributed to S Larson.

82 records · Page 5Linked to original sources
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Experts practice what they preach: A descriptive study of best and normative practices in end-of-life discussions.

BACKGROUND: Advance directives (ADs) are widely regarded as the best available mechanism to ensure that patients' wishes about medical treatment at the end of life are respected. However, observational studies suggest that these discussions often fail to meet their stated goals. OBJECTIVES: To explore best practices by describing what physicians who are considered expert in the area of end of-life bioethics or medical communication do when discussing ADs with their patients and to explore the ways in which best practices of the expert group might differ in content or style from normative practice derived from primary care physicians' discussions of ADs with their patients collected as part of an earlier study. DESIGN: Nonexperimental, descriptive study of audiotaped discussions. SETTING: Outpatient primary care practices in the United States. PARTICIPANTS: Eighteen internists who have published articles in the areas of bioethics or communication and 48 of their patients. Fifty-six academic internists and 56 of their established patients in 5 practice sites in 2 locations-Durham, NC, and Pittsburgh, Pa. Eligible patients were at least 65 years old or suffered from serious medical illness and had not previously discussed ADs with their physician. Expert clinicians had discretion regarding patient selection, while the internists chose patients according to a predetermined protocol. MEASUREMENTS: Coders applied the Roter Interaction Analysis System (RIAS) to audiotapes of the medical visits to describe communication dynamics. In addition, the audiotapes were scored on 21 items reflecting physician performance in specific skills related to AD discussions. RESULTS: Experts spent close to twice as much time (14.7 vs 8.1 minutes, P<.001) and were less verbally dominant (P<.05) than other physicians during AD discussions. When length of visit was controlled statistically, the expert physicians gave less information about treatment procedures and biomedical issues (P<.05) and asked fewer related questions (P<. 05) but tended toward more psychosocial and lifestyle discussion and questions. Experts engaged in more partnership building (P<.05) with their patients. Patients of the expert physicians engaged in more psychosocial and lifestyle discussion (P<.001), and more positive talk (P<.05) than patients of community physicians. Expert physicians scored higher on the 21 items reflecting AD-specific skills (P<.001). CONCLUSIONS: Best practices as reflected in the performance of expert physicians reflect differences in measures of communication style and in specific AD-related proficiencies. Physician training in ADs must be broad enough to include both of these domains. Arch Intern Med. 2000;160:3477-3485.

Adult↗
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Combined spinal-epidural anesthesia for Cesarean section in a patient with peripartum dilated cardiomyopathy.

PURPOSE: To report a case of peripartum dilated cardiomyopathy associated with morbid obesity and possible difficult airway presenting for elective Cesarean section, which was successfully managed with combined spinal-epidural anesthesia. CLINICAL FEATURES: A morbidly obese parturient with a potentially difficult airway, suffering from idiopathic peripartum cardiomyopathy (ejection fraction 20%), was scheduled for an elective Cesarean section. A combined spinal epidural anesthesia was performed and 6 mg of bupivacaine were injected into the subarachnoid space. This was supplemented after 60 min with 25 mg of bupivacaine injected epidurally. The patient's hemodynamic status was monitored with direct intra-arterial blood pressure and central venous pressure measurements. The patient's perioperative course was uneventful. CONCLUSION: In patients suffering from peripartum cardiomyopathy, undergoing Cesarean section, combined spinal-epidural anesthesia may be an acceptable anesthetic alternative.

Adult↗
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Imaging TCR-dependent NFAT-mediated T-cell activation with positron emission tomography in vivo.

A noninvasive method for molecular imaging of T-cell activity in vivo would be of considerable value. It would aid in understanding the role of specific genes and signal transduction pathways in the course of normal and pathologic immune responses, and could elucidate temporal dynamics and immune regulation at different stages of disease and following therapy. We developed and assessed a novel method for monitoring the T-cell receptor (TCR)-dependent nuclear factor of activated T cells (NFAT)-mediated activation of T cells by optical fluorescence imaging (OFI) and positron emission tomography (PET). The herpes simplex virus type 1 thymidine kinase/green fluorescent protein [HSV1-tk/GFP (TKGFP)] dual reporter gene was used to monitor NFAT-mediated transcriptional activation in human Jurkat cells. A recombinant retrovirus bearing the NFAT-TKGFP reporter system was constructed in which the TKGFP reporter gene was placed under control of an artificial cis-acting NFAT-specific enhancer. Transduced Jurkat cells were used to establish subcutaneous infiltrates in nude rats. We demonstrated that noninvasive OFI and nuclear imaging of T-cell activation is feasible using the NFAT-TKGFP reporter system. PET imaging with [(124)I]FIAU using the NFAT-TKGFP reporter system is sufficiently sensitive to detect T-cell activation in vivo. PET images were confirmed by independent measurements of T-cell activation (e.g., CD69) and induction of GFP fluorescence. PET imaging of TCR-induced NFAT-dependent transcriptional activity may be useful in the assessment of T cell responses, T-cell-based adoptive therapies, vaccination strategies and immunosuppressive drugs.

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Role of visual attention in cognitive control of oculomotor readiness in students with reading disabilities.

This study investigated eye movement and comprehension therapy in Grade 6 children with reading disabilities (RD). Both order of therapy and type of therapy were examined. Furthermore, the implications of visual attention in ameliorating reading disability are discussed. Thirty-one students with RD were identified using standardized reading comprehension tests. Eye movements were analyzed objectively using an infra-red recording device. Reading scores of participating children were 0.5 to 1 SD below the national mean. Testing took place before the start of therapy (T1) and was repeated after 12 weeks (T2) and 24 weeks (T3) of therapy. One group of students had eye movement therapy first, followed by comprehension therapy; in the other group, the order was reversed. Data were evaluated using a repeated measures MANOVA and post hoc tests. At T1, mean reading grade was 2 years below grade level, and eye movement scores were at about Grade 2 level. Mean growth in reading comprehension for the total sample was 2.6 years (p < .01) at T3; equally significant improvement was measured in eye movements (p < .01). Learning rate in reading comprehension improved from 60% (T1) to 400% (T3). Although within-group differences were statistically significant, between-group differences were not significant for comprehension or eye movements. Order of therapy (comprehension first or eye movements first) was not significant. Improvements in within-group scores for comprehension and eye movements were consistently significant at T2 and T3. Eye movement therapy improved eye movements and also resulted in significant gains in reading comprehension. Comprehension therapy likewise produced improvement both in eye movement efficiency and in reading comprehension. The results support the notion of a cognitive link among visual attention, oculomotor readiness, and reading comprehension.

Attention↗
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[Monoclonal antibodies and uveal melanomas].

The authors, who have succeeded since 1976 in cultivating cells of ocular melanoma in continuous lines report the different stages for producing specific monoclonal antibodies. They particularly insist on the demonstration, through radioimmunoassay, of the specificity of marked monoclonal antibodies, on the immunohistochemical study and on biodistribution. From these data, an immunotherapy protocol has been perfected and starts being applied to human beings.

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