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Biomedical subjects

L J Morrison

Publications and source records attributed to L J Morrison.

27 records · Page 2Linked to original sources
PubMed1982

Tumor-directed immunity in human neuroblastoma.

Tumor-directed immunity was assessed in 29 patients with neuroblastoma (NB). Cell-mediated and humoral immunity were assessed in vitro using the one-stage direct capillary leukocyte migration inhibition test and the indirect, membrane immunofluorescence test, respectively. Leukocytes from 83% of NB patients, 40% of normal children, and 24% of adults were inhibited by NB-derived materials. NB patients' leukocytes reacted as frequently with materials from allogeneic neuroblastomas as with autologous extracts. Sera from 50% of NB patients, 8% of child controls, and 18% of adult controls reacted with allogeneic tissue cultured neuroblastoma cells. Leukocytes from NB patients, control children, and control adults were inhibited at a similar low frequency by extracts of human melanomas and cancers of cervix, colon, and breast. Sera from NB patients and controls reacted infrequently with cultured melanoma cells.

Antibody Formation↗
PubMed1981

Tumor-directed immunity in neuroblastoma patients and their related and unrelated contacts.

Tumor-directed cell-mediated and humoral immunity were assessed in vitro in neuroblastoma (NB) patients, and also in their relatives and genetically unrelated contacts, using the one-stage, direct, capillary leukocyte migration inhibition (LMI) test and the indirect, membrane, immunofluorescence test (IFT), respectively. Leukocytes from 83% and sera from 50% of NB patients examined were selectively reactive with NB cells, and materials derived from them. Genetically unrelated contacts as well as relatives of NB patients showed NB-directed immunity, the frequency of which increased with increasing closeness of contact with these patients. These findings suggest that the environment of NB patients may contain some tumor-derived material which induces detectable sensitization in those sharing that environment. Such tumor-derived material would appear to have a high degree of infectivity, low degree of oncogenicity, and probably also a low general pathogenicity.

Antibody Formation↗
PubMed1980

In vitro reaction of cancer patients and others to Bacillus Calmette-Gueérin.

We examined the in vitro reaction of leukocytes from 71 cancer patients and 121 control donors (disease-free individuals or patients with non-malignant non-debilitating conditions) against Bacillus Calmette-Guérin using a one-stage capillary leukocyte migration assay. The proportion of reactive cancer patients and control donors increased with increasing BCG concentration, but the proportion of patients who reacted was less than that of control donors at all concentrations of BCG. As cancer stage advanced and the volume of clinically detectable tumor increased, the proportion of reactive patients decreased. There was a small age-related decline in reactivity in the control population. The results of simultaneous in vitro tests and Mantoux reactions were concurrent in a majority of normal individuals so tested.

Adolescent↗
PubMed1979

Indirect leukocyte migration assay in patients with malignant melanoma.

Leukocytes from 72 melanoma patients and 75 control donors were examined in a two-stage (indirect) leukocyte migration assay, using formalin-fixed melanoma cells (FMC) and control, normal or non-melanoma tumour cells (FCC) as the source of antigen. Inhibitory supernatants were produced significantly more often by cultures of melanoma leukocytes and FMC than by melanoma leukocytes and FCC or control leukocytes and FMC or FCC. Reactive leukocytes were most frequently derived from stage II patients (65%), followed by stage I patients with tumour present (58%), stage III patients (29%) and stage I patients without detectable tumour (20%). The likelihood that a melanoma patient's leukocytes would react increased progressively with the number of different FMC preparations tested. A similar, though less steep increase in reactivity was seen with control donor leukocytes and different FMC preparations. No significant increase in reaction frequency was seen with melanoma or control leukocytes exposed to increasing numbers of different FCC preparations. Significant discrimination between melanoma patients' and control donors' leukocytes was achieved with FMC from both primary and metastatic tumours. Concordance of positivity or negativity was seen in 60% of concurrent one-stage and two-stage leukocyte migration assays.

Adult↗
PubMedDate not supplied

Mortality and prehospital thrombolysis for acute myocardial infarction: A meta-analysis.

CONTEXT: Early administration of thrombolysis for acute myocardial infarction (AMI) may improve survival if safely and appropriately delivered. No systematic reviews that have comprehensively examined this topic exist in the literature. OBJECTIVE: To perform a meta-analysis of randomized controlled trials of prehospital vs in-hospital thrombolysis for AMI measuring in-hospital mortality. DATA SOURCES: The Cochrane search strategy was used to search MEDLINE, EMBASE, and the Science Citation Index (1982-1999); Dissertation Abstracts (1987-1999); and Current Contents (1994-1999) for the terms thrombolysis, thrombolysis therapy, prehospital, and acute myocardial infarction. In addition, text and journal article bibliographies were hand searched, the National Institutes of Health Web site was reviewed, and primary authors and thrombolytic drug manufacturers were contacted for unpublished studies. STUDY SELECTION: Randomized controlled trials of prehospital vs in-hospital thrombolysis for AMI measuring all-cause hospital mortality were included. Two authors independently reviewed 175 citations by title, abstract, or complete article. After exclusion of 30 duplicate citations, 145 studies remained, of which 6 studies and 3 follow-up studies met the inclusion criteria. DATA EXTRACTION: Independent data abstraction by 2 reviewers blinded to the journal, title, and author was confirmed by consensus. Trial quality was independently assessed by 2 other coauthors, blinded to the author, title, journal, introduction, and discussion. DATA SYNTHESIS: The results of the 6 randomized trials (n=6434) were pooled and indicated significantly decreased all-cause hospital mortality among patients treated with prehospital thrombolysis compared with in-hospital thrombolysis (odds ratio, 0.83; 95% confidence interval, 0.70-0.98). Results were similar regardless of trial quality or training and experience of the provider. Estimated (SE) time to thrombolysis was 104 (7) minutes for the prehospital group and 162 (16) minutes for the in-hospital thrombolysis group (P=.007). CONCLUSIONS: Our meta-analysis suggests that prehospital thrombolysis for AMI significantly decreases the time to thrombolysis and all-cause hospital mortality. JAMA. 2000;283:2686-2692.

Emergency Medical Services↗
PubMedDate not supplied

The battering syndrome: a poor record of detection in the emergency department.

A review of recent studies shows that physicians have a poor record in detection of cases of domestic violence, with only one battered woman in twenty-five diagnosed on physical examination. Emergency physicians who are more aware of the distinguishing features of the battering syndrome and provide appropriate crisis intervention may help victims to seek early legal and social aid, thereby preventing development of a chronic situation or a personal tragedy.

Adult↗
PubMedDate not supplied

Conversion rates for prehospital paroxysmal supraventricular tachycardia (PSVT) with the addition of adenosine: a before-and-after trial.

OBJECTIVE: To determine whether the prehospital administration of adenosine to adults with stable and unstable paroxysmal supraventricular tachycardia (PSVT) influences conversion rate (CR) to sinus rhythm, scene time, use of synchronized electrical cardioversion (SEC), and accuracy of rhythm strip interpretation by paramedics. METHODS: This before-and-after study compared a retrospective control group (CG) prior to the introduction of adenosine with a prospective treatment group (TG) following the addition of adenosine to the PSVT treatment protocol in a large urban advanced life support emergency medical services system. The population represented patients > or = 18 years of age with PSVT diagnosed by the paramedic (defined as spontaneous onset of a regular narrow-complex tachycardia between 140 and 250 beats/minute). RESULTS: The CG comprised 74 calls and the TG 137 calls. The overall CR was higher in the TG (59% vs 32%, p < 0.001). The SEC and spontaneous conversion rates remained unchanged. The proportion of untreated patients with PSVT decreased from 26% CG to 12% TG (p < 0.01). Scene times were longer in the TG (26 vs 19 minutes, p < 0.001). Agreement between paramedic and physician rhythm strip interpretations was fair to moderate (CG kappa 0.43 [95% CI: 0.14, 0.72]; TG kappa 0.37 [95% CI: 0.13, 0.61]). CONCLUSIONS: The introduction of adenosine was associated with a significant increase in the prehospital CR of stable and unstable PSVT, while the SEC and spontaneous conversion rates were similar in each group; however, scene times were longer in the TG and paramedic accuracy in rhythm strip interpretation remained fair to moderate.

Adenosine↗