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Biomedical subjects

N J Smith

Publications and source records attributed to N J Smith.

At least 91 records · Page 5Linked to original sources
PubMed1981

Causes of death among anesthesiologists: 1930-1946.

The causes of death among anesthesiologists from 1930 through 1946 were determined and compared to the causes of death for contemporaneous physicians as well as anesthesiologists in later eras. Names of US white male anesthesiologists listed in the annual Directories of Anesthetists compiled by the International Anesthesia Research Society were searched for in the death files of the American Medical Association. Among those listed in the Directories 274 deaths were located. Causes were ascertained for 269 deaths and 259 causes were verified from death certificates. The leading causes of death of anesthesiologists and other physicians of the same era were cardiovascular-renal diseases and malignant neoplasms. The death rate from all causes was lower among anesthesiologists than among contemporaneous white men and other physicians. Death rates among anesthesiologists from 1930-1946 were similar to those among anesthesiologists in 1947-1956, but greater than those for 1957-1971. Among deaths from malignant neoplasms, those of the digestive organs were the most frequent and those of the respiratory tract the least. Anesthesiologists practicing in the earlier part of this century had lower death rates and they were less likely to die of malignant neoplasms than contemporaneous white men. The death rates for these anesthesiologists were similar to those for anesthesiologists during 1947-1956, but greater than rates observed for anesthesiologists during 1957-1971. This suggests that exposure to the fluorinated anesthetic agents introduced in the mid-1950s may not be an important health hazard.

Adult↗
PubMed1979

Susceptibility and synergy studies of methicillin-resistant Staphylococcus epidermidis.

Methicillin-resistant Staphylococcus epidermidis is an important cause of cerebrospinal fluid shunt infections and prosthetic valve endocarditis. Agar dilution minimum inhibitory concentrations were determined for 100 strains of methicillin-resistant S. epidermidis which were isolated from clinical specimens. Vancomycin inhibited all 100 strains at </=3.12 mug/ml, whereas clindamycin inhibited only 46 strains at </=12.5 mug/ml. Methicillin-resistant S. epidermidis strains were resistant to achievable levels of erythromycin, with 90 strains having a minimum inhibitory concentration of >/=3.12 mug/ml. Of the five cephalosporins and one cephamycin tested, cefamandole was the most active in vitro, inhibiting 97 strains at </=25 mug/ml. Antibiotic synergism was examined by a quantitative bacterial time-kill method. Synergism (>/=10(2) kill by the combination over the most effective single antibiotic at 24 h) was demonstrated with vancomycin (1.56 mug/ml) plus cefamandole (6.25 mug/ml) in 14 of 14 strains, vancomycin plus cephalothin (6.25 mug/ml) in 14 of 14 strains, vancomycin plus rifampin (0.008 to 0.012 mug/ml) in 6 of 12 strains, rifampin plus cefamandole in 9 of 12 strains, and rifampin plus cephalothin in 10 of 12 strains. The emergence of populations of bacteria resistant to 0.2 mug of rifampin per ml developed in three of five methicillin-resistant S. epidermidis strains tested. The addition of either vancomycin, cephalothin, or cefamandole to the rifampin prevented the emergence of resistance in these three strains. Clinical trials of synergistic antibiotic combination therapy for serious methicillin-resistant S. epidermidis infections are indicated.

Anti-Bacterial Agents↗
PubMed1979

Erythrocyte protoporphyrin/heme ratio in the assessment of iron status.

The protoporphyrinemia of iron deficiency is well recognized. Clinically, information on the protoporphyrin/heme molar ratio in whole blood offers certain advantages over protoporphyrin measurement alone. A procedure for determining this ratio is reported. Protoporphyrin is extracted, solubilized, and measured fluorometrically. Heme (as hemin chloride) is precipitated with the blood proteins, the precipitate is dissolved in an alkaline/pyridine solvent, and the resulting bispyridine ferriprotoporphyrin is measured spectrophotometrically. The molar ratio of these two metabolites correlates well with values for plasma ferritin, plasma iron, transferrin saturation, hemoglobin, and hematocrit. In some cases the ratio increases detectably while the other variables, especially hematocrit and hemoglobin, remain normal. Evidently it is a more sensitive index to iron status. For healthy men and women, the mean ratio is 16.0 (SD, 5.3). The mean + 3 SD, or a ratio of 32, is distinctly abnormal, as shown by a confirmatory test. We validated the test by surveying routine blood specimens obtained from several population groups.

Anemia, Hypochromic↗
PubMed1978

Familial myoclonic epilepsy with ataxia and neuropathy with additional features of Friedreich's ataxia and peroneal muscular atrophy.

A family is described in which a mother and three of her five children showed myoclonic epilepsy. The mother and one son were also ataxic; one other son had additional features of Friedreich's ataxia, and a daughter had peroneal muscular atrophy as well as myoclonic epilepsy and ataxia. Although some of these disorders have been associated in previously reported families, the occurrence of all three disorders in members of one family seems to be unique. It is concluded that this family shows the manifestations of one, probably dominant, gene. The differences in age of onset and manifestations may be explained by the action of one or more subsidiary genes.

Adult↗
PubMed1978

Measuring attitudes toward the physically disabled: testing the 'Attitude Towards Disabled Persons' scale (A.T.D.P. Form O) on social work and non-social work students.

The aim of the study was to test the U.S.A. Validated 'Attitude Towards Disabled Persons' Inventory (A.T.D.P. Form O) on a British student population to establish norms. The objectives were to test specific hypotheses related to the sex of the respondent, contact with physically disabled people and whether social work students had different attitude scores than non social work students. In addition, a comparison was made between the British and U.S.A. 'norms'. The student population of four specific British Universities comprised the sampling frame. The sample was a non probability accidental sample of social work and non social work students. Standardised A.T.D.P. Form Os were administered in group situations. Each form was accompanied by a letter explaining the study, together with a short questionnaire eliciting the sex of respondent and type and extent of any contact with disabled people. The findings demonstrated that there are probably differences between U.S.A. and British norms but that there are general similarities between the two countries. In both countries females, scored higher than males, which by interpretation indicates possibly a more favourable attitude. Contact with the disabled is also a contributing factor in higher scores. Social work students also tended to score more highly than non social work students. The implications of these findings are discussed with regard to the possible development of professional attitudes for those who work with the disabled. It is postulated that 'idealisation' may be reflected in attitudes of students who intend to work with the disabled which, after general and professional life experience gives way to less favourable attitudes. Closeness of contact of respondents to disabled people is a factor which needs further exploration in connection with changing attitude scores.

Adult↗