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Biomedical subjects

G Katz

Publications and source records attributed to G Katz.

At least 109 records · Page 6Linked to original sources
PubMed1978

Radiation exposure in patients undergoing endoscopic retrograde cholangiopancreatography and endoscopic papillotomy.

Radiation exposure was studied in 327 patients undergoing endoscopic retrograde cholangiopancreatography, or endoscopic papillotomy taking into account fluoroscopy time and incident area exposure. The mean fluoroscopy time was 238 +/- 152 seconds and the incident area exposure 3,730 +/- 2,790 R X cm2. These results were compared with standard exposures in upper GI series and colon examinations as found in the literature.

Adult↗
PubMed1977

The hazards of combined chemotherapy and radiotherapy in rhabdomyosarcoma of the mediastinum: a case report.

A total tumour irradiation dose of 2900 rad and a dose of 2500 rad to a metastasis, as well as the administration of 330 mg/m2 adriamycin, successfully eradicated all traces of malignant disease after partial surgical excision in a 12-year-old Black boy with a rhabdomyosarcoma of the mediastinum. The treatment, however, damaged the heart and caused the death of the patient.

Cardiomyopathies↗
PubMed1976

Neonatal pyridoxine responsive convulsions due to isoniazid therapy.

A 17-day-old infant on isoniazid therapy 13 mg/kg daily from birth because of maternal tuberculosis was admitted after 4 days of clonic fits. No underlying infective or biochemical cause could be found. The fits ceased within 4 hours of administering intramuscular pyridoxine, suggesting an aetiology of pyridoxine deficiency secondary to isoniazid medication.

Female↗
PubMed1975

Schizophrenic performance on form E of Cattell's 16PF test.

Form E of Cattell's 16PF test was administered to 515 hospitalized schizophrenics. This sample was compared to Cattell's standardization population for both raw scores and sten scores. Comparisons were made between males and females, acute patients and chronic patients, and amongst three categories of schizophrenia (paranoid, undifferentiated, schizo-affectives). The results indicate that the "schizophrenic profile," reported in previous research with Form A, did not obtain expected differentiations among schizophrenic categories. The question of the usefulness of Form E in diagnosing schizophrenia was raised.

Acute Disease↗
PubMed1975

The anticipation of death by violence: a psychological profile.

College students (n = 172) completed Cattell's personality factor questionnaire, Rotter's locus of control scale, Speilberger's trait anxiety measure, and Sabatini and Kastenbaum's self-completed death certificate. Comparison of profiles for subjects anticipating sudden violent death (SVD, n = 59) with those anticipating natural death (ND, n = 113) disclosed that the SVD group was characteristically more anxious and socially isolated. A sex-by-type of death interaction occurred for locus of control, with SVD females being the most external, suggesting that this group was more likely to "give up" in response to stress. The data support Shneidman's concept of subintentioned death in disclosing that several personality factors may be associated with violent death.

Accidents↗
PubMed1970

The range of thermal insulaton in the tissues of the new-born baby.

1. Rectal temperature and skin temperatures were measured in twenty-eight naked babies weighing 1.1-4.5 kg, lying supine in environments of 25-31 degrees C when air speed was 4-7 cm/sec. The ratio of external insulation to internal or tissue insulation for the whole body averaged 2.7 but varied inversely with body weight; the ratio was higher than this on the trunk, and five times lower than this on the hand and foot. The mean ratio rose threefold when environmental temperature was increased to 34-35 degrees C.2. Direct measurements of heat flow from the back of a hand placed in a water jacket maintained at 32 degrees C were made in thirty-three babies. Heat loss averaged 3 kcal/m(2).hr. degrees C at low environmental temperature, but the loss was often rather less than this in the first 24 hr of life. Heat loss from the hand increased three- to fourfold, during exposure to an environment of 35 degrees C.3. When babies more than 48 hr old were exposed to an environment of 34-35 degrees C, heat loss from the hand only increased when rectal temperature reached between 36.6 and 37.3 degrees C; a slightly higher rectal temperature was usually reached before heat loss rose in babies less than 24 hr old.4. Similar methods were used to study specific tissue insulation in three babies with congenital defects of the brain who lacked evidence of temperature control. No changes in insulation were detected in these three babies following changes in environmental temperature.5. It is concluded that the range and pattern of control that can be exerted over the specific thermal insulation of the tissues is essentially the same in babies 2-20 days old as it is in adult life.

Anencephaly↗
PubMed1970

The total thermal insulation of the new-born baby.

1. One hundred and seventeen healthy new-born babies weighing between 0.9 and 4.8 kg at delivery have been studied during the first ten days of life, and sixteen of these babies have been studied serially for 6 weeks after birth. The babies lay supine in a draught-free environment (air speed 4-5 cm/sec) of moderate humidity. The operative temperature was between 26 and 38 degrees C for the babies who were studied naked.2. Total non-evaporative heat loss was calculated from simultaneous measurements of oxygen consumption, evaporative water loss and the concomitant change in mean body temperature.3. Approximately 10% of the total body surface area was in contact with the mattress or floor. Conductive heat loss accounted for only about 5% of all non-evaporative heat loss when the naked baby was lying on a thick foam mattress, but for as much as 25% when the baby was lying in a water-jacketed chamber with a floor of clear plastic approximately 5 mm thick.4. Insulation to heat loss by convection and radiation varied with environmental temperature. Total specific insulation was low in a warm environment when the naked baby vasodilated, and rose by between 16 and 25% to a maximum in an environment of 31 degrees C. It decreased significantly when the baby became physically active in environments with a temperature less than this.5. Total specific insulation in an environment of 31 degrees C varied with body size: it averaged 0.156 degrees C.m(2).hr/kcal in seven naked babies weighing 0.9-1.2 kg, rose to 0.190 degrees C.m(2).hr/kcal in twelve babies weighing 1.8-2.2 kg, and averaged 0.201 degrees C.m(2).hr/kcal in the thirty-four babies who weighed over 3 kg. Tissue insulation accounted for 23% of this total specific insulation in the smaller babies, and about 28% of the total in babies weighing over 3 kg.6. Clothing ten babies in a vest, napkin and long cotton nightdress increased the total specific insulation by an average of 0.23 degrees C.m(2).hr/kcal.

Birth Weight↗