Biomedical subjects

P Hall

Publications and source records attributed to P Hall.

At least 253 records · Page 14Linked to original sources

PubMed1975

Decision-making in clinical practice: application of predictors, indicators and indices to the medical history obtained by a self-administered questionnaire.

A theoretical description of predictors, indicators, and health indices was presented in an earlier paper (Hall and Sebag, 1974). The application of predictors, indicators and health indices--including dynamic health indices--to anamnestic data obtained by a self-administered questionnaire is presented herein. Predictors and indicators showed a varying degree of 'decision-making significance' in the 122 questions examined. The health index distinguished between diagnosed individuals and those receiving no diagnosis(es). The dynamic health index was found to reflect changes in the health status of an individual over a period of time.

Decision Making↗

PubMed1975

Relative susceptibility of altitude-acclimatized mice to acute oxygen toxicity.

The influence of hypoxic acclimatization at altitudes of 0, 5,000, or 15,000 ft on the relative susceptibility to acute oxygen poisoning was determined in 288 adult female mice. After acclimatization periods of 1, 2, 4, or 8 wk, the mice were exposed to oxygen at high pressures (OHP) of 4, 6, or 9 ATA and the times to convulsion and death recorded. A factorial analysis of variance indicated that altitude and OHP level had inverse, log-linear effects on both parameters. The duration of acclimatization progressively decreased the time to death. The onset of convulsions and death was independent of body weight. There were significant interactions on the measured parameters between various combinations of altitude, OHP level, and duration of acclimatization. While alterations in the metabolism of gamma-aminobutyric acid and high-energy compounds are common to both hypoxia and hyperoxia, the most plausible explanation of the results relates to the decrease in buffer base induced by hypoxic acclimatization which might have caused CO2 potentiation of OHP symptoms.

Acclimatization↗

PubMed1975

Relationship between work environment and anamnestic health status. Use of predictors, indicators and indices for the evaluation of medical and environmental factors.

Experience with computerized medical record systems in handling medical data in hospital and health screening environments has led to the development of a new approach to the evaluation of medical data. Predictors and indicators quantify the "information value" of medical data and can, theoretically, do so for all types of data. This paper describes the methodology and presents the results obtained when the technique was applied to the anamnestic data of the medical history and environmental data about the conditions in the work environment. Over 4,000 individuals who underwent multiphasic health screening were used as a data base for this study. From these 4,000 persons 3,164 were used for the calculation of anamnestic predictors and indicators and 1,013 for the environmental predictors and indicators. Anamnestic environmental indices were calculated upon 77 test individuals so as to correlate the association and dependence of the two indices.

Environmental Exposure↗

PubMed1975