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Biomedical subjects

C O'Brien

Publications and source records attributed to C O'Brien.

At least 271 records · Page 15Linked to original sources
PubMed1977

Use of the intra-aortic balloon support for refractory low cardiac output in myocardial contusion.

A patient with refractory low cardiac output and recurring ventricular arrhythmias resulting from myocardial contusion was treated with intra-aortic balloon counterpulsation. Use of the intra-aortic balloon resulted in an increased cardiac output and control of the ventricular arrhythmias. After 1 year the patient shows no sequelae of myocardial contusion, although he is still paraplegic.

Assisted Circulation↗
PubMed1976

Cell-mediated destruction of human leukemic cells by MHC identical lymphocytes: requirement for a proliferative trigger in vitro.

These experiments have investigated cellular mechanisms involved in the generation of cellular immune responses to human acute leukemic blasts. Because normal human lymphocytes are not able to recognize immunologically, in vitro, lymphocytes from MHC identical siblings, the present studies have examined the in vitro proliferative and cytotoxic responses of normal lymphocytes to MHC identical AML and ALL blasts. In those cases where acute leukemic cells were unable to induce a proliferative response by MHC identical lymphocytes, the generation of effective anti-leukemic cytotoxicity required the addition of unrelated stimulating cells to the sensitization culture. In contrast, leukemic blasts that induced a proliferative response by MHC identical lymphocytes were also able to stimulate anti-leukemic cytotoxicity. This could be augmented by the addition of unrelated stimulating cells to the sensitization culture. The specificity of anti-leukemic cell cytotoxicity was demonstrated in all instances by simultaneous testing of putative killer cells on 51Cr leukemic blasts as well as 51Cr-labeled MHC identical phytohemagglutinin blasts or normal lymphocytes. Simultaneous sensitization to MHC identical leukemic blasts and unrelated stimulating lymphocytes did not invariably generate anti-leukemic cytotoxicity even when allogeneic cytotoxicity was observed; the absence of demonstrable suppressor activity in these nonreactive combinations suggested that some individuals may be specifically immunoincompetent, and thereby unable to generate effective anti-leukemic CML.

Cell Transformation, Neoplastic↗
PubMed1976

A system for rapid analysis of long-term recordings of heart rate and other physiological parameters.

Using miniature cassette tape recorders, measurement of ECG and other physiological measures is possible in industrial or working situations. The development of a semi-automatic high speed processing system for analysis of the tape recorded data is described. This system decodes the signals on the tape, converts ECG to heart rate and presents a listing of the heart rate variation over the recording period, which may be up to 24 hours. A punched paper tape copy of the listing is used for input into a mainframe computer for subsequent analysis. The recorders and processing system have been used extensively for three years on a study of industrial work stress, and have proved reliable, accurate, and of sufficient sensitivity for in-depth analysis. They allow considerable data to be collected, permitting the thorough statistical analysis necessary for the interpretation of complex physiological responses.

Computers↗
PubMed1975

Infants' home environments: a comparison of high-risk families and families from the general population.

Home environments of 30 infants at high-risk for developmental retardation were compared with those of 30 infants from the general population (matched for age, sex, and parity) by means of the Home Observation Measurement of the Environment. Fifteen high-risk infants attended a day-care intervention program; 15 did not. The Home Observation for Measurement of the Environment showed significant differences (ps less than .001) between the high-risk groups and the general population, favoring the general population, on all factors (maternal-warmth, absence of restriction and punishment, organization of the environment, appropriate toys, maternal involvement, and opportunities for variety) but none between the two high-risk groups.

Child Day Care Centers↗
PubMedDate not supplied

Esophageal stricture caused by a Motrin tablet (ibuprofen).

A 37-year-old man experienced acute odynophagia after ingesting a single tablet of Motrin (ibuprofen, 800 mg). Because the pill was swallowed without water, a transient delay in its passage through the esophagus resulted in localized mucosal inflammation and a drug-induced stricture.

Adult↗
PubMedDate not supplied

The phenotypic frequencies of group specific component and alpha-2-HS-glycoprotein in three ethnic groups. The use of these proteins as racial markers in forensic biology.

The phenotypic frequencies of group-specific component (Gc) and alpha-2-HS-glycoprotein (A2HS) were determined in White European, Asian and Afro-Caribbean populations. Typical allele frequencies were observed for Gc, with Gc 1S being the major allele for the first two groups and Gc 1F being the major allele for Afro-Caribbeans. For all groups the dominant A2HS allele was A2HS 1, although Asians had a significantly higher proportion of this allele than the White Europeans. Gc and A2HS either singly or in combination with other blood grouping systems provide good discriminating potential. The A2HS 10 allele was detected with a very low frequency in the White European group (A2HS 10 = 0.0013) and was not detected in the Asian group, while the Afro-Caribbean group had a relatively high frequency of this allele (A2HS 10 = 0.0966). The different distribution of the Gc 1F and A2HS 10 alleles in White Europeans and Asians compared with Afro-Caribbeans, can be used to determine the likelihood of blood coming from an Afro-Caribbean.

Africa, Western↗
PubMedDate not supplied

A naturalistic follow-up study of French-speaking opiate-maintained heroin-addicted patients: effect on biopsychosocial status.

The purpose of this study was to evaluate the impact of opiate maintenance pharmacotherapy (OMP) on the biopsychosocial status of opiate-addicted patients in a cultural environment (France) that is not favorable to OMP and where methadone is not available. Buprenorphine and laudanum (opium tincture), which, to our knowledge, has not been reported previously in the scientific literature for OMP, were used in this study of a group of 18 opioid-dependent subjects. At time of initiation of OMP, mean age was 33 years, sex ratio male: female was 14:4, average duration of drug use was 11.2 years. Six patients received laudanum p.o., 15 g daily; 12 patients received buprenorphine sublingual 2 to 4 mg daily. This group of patients was selected because of persistent relapse and impairment after an average of 5.7 drug-free-oriented treatments over a period of 6.8 years. Initial evaluation and follow-up were made by way of a 150-min semi-structured interview using the Lifetime Retrospective Evaluation Score Table (LREST) and the Addiction Severity Index (ASI). Results showed that body weight and scores for physical and psychological health, socioprofessional status, and family relationships improved significantly after 14 months of OMP. These results show that highly impaired opiate-addicted patients doing poorly in drug-free treatment can respond to OMP even though methadone is not available and the idea of OMP is not favored.

Adult↗