Biomedical subjects

T Stafford

Publications and source records attributed to T Stafford.

3 recordsLinked to original sources

PubMed1990

Validity of the bulk-staining technique to separate artifactual from in vivo bone microdamage.

Frost's bulk-staining technique clearly separates artifactual cracking in bone from that caused by mechanical loading in vivo. One-centimeter sections of human rib were either bulk stained before preparation of a thin section (experimental) or stained after grinding to a thickness of 150 microns (control). Microdamage produced before preparation can be separated from that caused by the preparation itself. Moreover, the technique does not cause additional artifactual cracking through dehydration. This technique provides a valid way to test hypotheses about the role that microdamage creation or its repair plays in skeletal pathology.

Aged↗

PubMed1986

Cardiopulmonary response to extracorporeal venous CO2 removal in awake spontaneously breathing dogs.

The ventilatory response to a reduction in mixed venous PCO2 has been reported to be a decrease in breathing even to the point of apnea with no change in arterial CO2 partial pressure (PaCO2), whereas a recent report in exercising dogs found a small but significant drop in PaCO2 (F. M. Bennett et al. J. Appl. Physiol. 56: 1335-1337, 1984). The purpose of the present study was to attempt to reconcile this discrepancy by carefully investigating the cardiopulmonary response to venous CO2 removal over the entire range from eupnea to the apneic threshold in awake, spontaneously breathing normoxic dogs. Six dogs with chronic tracheostomies were prepared with bilateral femoral arteriovenous shunts under general anesthesia. Following recovery, an extracorporeal venovenous bypass circuit, consisting of a roller pump and a silicone-membrane gas exchanger, was attached to the femoral venous cannulas. Cardiopulmonary responses were measured during removal of CO2 from the venous blood and during inhalation of low levels of CO2. Arterial PO2 was kept constant by adjusting inspired O2. The response to venous CO2 unloading was a reduction in PaCO2 and minute ventilation (VE). The slope of the response, delta VE/delta PaCO2, was the same as that observed during CO2 inhalation. This response continued linearly to the point of apnea without significant changes in cardiovascular function.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

PubMed1985

Computerized data retrieval system for colon surgery.

Good clinical practice is based on a continuous reevaluation of one's own work as compared with published standards. That which limits particularly the private practitioner from examining and publishing his data, is not the lack of desire, but the scarcity of opportunities and resources to do so. Computers as tools for data retrieval and analysis for research purposes and patient management have been available for some time. They have been of limited utility for most surgeons because of an inhibiting size and/or training period, and illogical design. The authors discuss the limitations of much of the available computer "tools," and present a system, METABASE, specifically designed for colon and rectal surgeons to use in their private practices for data retrieval and analysis.

Colon↗