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Biomedical subjects

A Nightingale

Publications and source records attributed to A Nightingale.

7 recordsLinked to original sources
PubMed1999

The monitoring of contaminated impervious planar surfaces.

The responses of several types of surface contamination monitor have been investigated for three typical working surfaces contaminated by three radionuclides commonly used in diagnostic or analytical biomedical applications. Of the three radionuclides, 99mTc is an intermediate-energy gamma emitter, 125I decays by electron capture, emitting low-energy x-rays, and 32P is a moderate-energy beta emitter. For each radionuclide monitored values have generally been found to be within 30% of projected response, this being based on calibrations which make use of standard radionuclide sources and conditions. The several types of contaminated non-absorbent surface that have been investigated produce monitored values which for a given type of monitor and radionuclide cannot be differentiated from each other.

Equipment Contamination↗
PubMed1997

Radiation dose and in vitro precision in paediatric bone mineral density measurement using dual X-ray absorptiometry.

Dual X-ray absorptiometry (DXA) is one of the most widely used techniques for non-invasive assessment of bone integrity. There is a growing demand for measurement of paediatric bone status. In DXA the principal radiation risks to patients are the carcinogenic and genetic effects. Radiation dosimetry is well established for DXA in adults, but there are limited paediatric data available. We report on a study to estimate the effective doses (EDs) received by typical 5- and 10-year-old children using the paediatric scan mode on the Lunar DPX-L bone mineral density scanner. Entrance surface doses (ESDs) and percentage depth doses for the total body and PA spine scan modes were measured using lithium borate thermoluminescent dosemeters (TLDs) located at the surface and distributed at various organ locations in anthropomorphic child phantoms. The EDs were calculated from the percentage depth doses, amount of each organ irradiated and tissue weighting factors. The ESDs were measured to be 6.0 and 0.12 microGy for the posteroanterior (PA) spine and total body, respectively. PA spine EDs were calculated as 0.28 and 0.20 microSv for the 5- and 10-year-old, respectively. Total body EDs were 0.03 and 0.02 microSv for the 5- and 10-year-old children, respectively. These results compare with an adult ED of 0.21 microSv for the PA spine. They are also more than two orders of magnitude lower than reported ESDs and EDs for paediatric chest X-rays. Bone mineral density (BMD) short-term in vitro precision was 0.5% and 1% in the 5- and 10-year-old phantoms, respectively. In conclusion, the Lunar DPX-L in the paediatric mode has a high precision and very low radiation doses, similar to those reported for the adult mode.

Absorptiometry, Photon↗
PubMed1989

Quality of outcome and cost in an obstetric and neonatal service.

A review has been made of the outcome and efficiency of the obstetric and neonatal service, St Helen's Hospital, Auckland. In the last seven years there has been a 33% fall in perinatal mortality rates to 5.88 per 1000 births in 1987. The average perinatal death rate for Maori infants was low, 4.81 per 1000 compared to 7.43 per 1000 for Europeans over this period. There has been a 38% increase in births to 3597 a year while the total hospital staffing has only risen 9%. Thus the ratio of births to staff has increased by 26.6% to 15.6. The cost per infant delivered in constant dollars has fallen 18.7% in the same period to $2432. The postnatal bed occupancy was 101% in 1987 and the average day stay fell to 5.7 days. An extra 61 full time staff would be needed to reduce the workload to that of 1981 and the staff is now unable to give the family focused holistic care that is needed.

Costs and Cost Analysis↗
PubMed1984

Serous effusions in monocytic leukaemias.

We report four patients who either presented with or developed serous effusions during the course of monocytic leukaemia. This finding has not been documented previously. All the patients had very high peripheral blood monocyte counts when effusions developed. The effusions resolved after the patients were treated with anti-leukaemic therapy. It is therefore likely that the effusions were disease related. Two of the patients have been treated with razoxane, one with etoposide and the other with cytarabine.

Aged↗