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Biomedical subjects

J A Lack

Publications and source records attributed to J A Lack.

At least 19 recordsLinked to original sources
PubMed1997

Calculation of drug dosage and body surface area of children.

The British National Formulary and many reference textbooks recommend that drug dosages for children be calculated according to body surface area (BSA). Although many rules for drug dosage have been developed, based on age, weight and surface area, none has been accurate and simple enough for routine use. These rules are described, and one for clinical use: up to 30 kg, a child's drug dose may be (wt x 2)% of an adult dose; over 30 kg, (wt + 30)% of an adult dose. If this percentage of an "adult" dose of a drug is used, not only is the BSA curve followed more closely than with the conventional mg kg-1 regimen, but fewer major errors of prescription may be expected.

Adolescent↗
PubMed1994

An anaesthetic minimum dataset and report format. Society for Computing and Technology in Anaesthesia (SCATA). European Society for Computing and Technology in Anaesthesia (ESCTAIC).

The dataset necessary to produce reports for anaesthetic training purposes is described, together with appropriate definitions. The format for a standard report that may be used in a logbook is also described. These have been accepted by the Royal College of Anaesthetists. The German Anaesthetic Society (Deutsche Gesellschaft für Anaesthesiologie und Intensivmedizin, DGAI) has accepted the dataset and definitions.

Anesthesiology↗
PubMed1993

The parallel Lack anaesthetic breathing system.

The parallel Lack system is a new modification of the Mapleson A system comprising separate inspiratory and expiratory tubes. To determine that the function of the system was that anticipated of a Mapleson A, the fresh gas flow requirements to prevent rebreathing during spontaneous ventilation were assessed in three situations: (1) a lung model (2) conscious volunteers and (3) anaesthetised patients. Two sets of criteria to define rebreathing were used; (A) those based on changes in ventilation or end-expired carbon dioxide tension and (B) minimum inspired carbon dioxide tension. Using A, rebreathing occurred at a fresh gas flow to minute ventilation ratio (VF/VE) of 0.75 for the lung model, and 0.73 for conscious volunteers. These results were comparable to those obtained for a Magill attachment. They were also close to the point at which mechanical dead space began to increase in the lung model. Criteria B gave much lower values for the onset of rebreathing. Rebreathing was present by criteria A in five of the six anaesthetised patients at a fresh gas flow of 60 ml.kg-1.min-1 (VF/VF of 0.78). The results confirm that the parallel Lack behaves as a Mapleson A system. The resistance to breathing posed by the parallel Lack was also comparable to the Magill system.

Adult↗
PubMed1992

Resource management.

Explore the source record for details and available documents.

Costs and Cost Analysis↗
PubMed1992

The pre-operative anaesthetic visit. Its value to the patient and the anaesthetist.

One hundred and thirty-two patients staying in hospital more than 24 h were visited pre- and postoperatively. Patients were asked a standard set of questions, and 39% could not remember accurately what they were asked. This has important medicolegal implications. In 15% of patients, information that significantly altered subsequent anaesthetic management was discovered, but in less than 3% would ignorance of the patient's condition have required postponement of the surgery. We conclude that the major reason for a pre-operative visit by an anaesthetist is that patients appreciate it, rather than it being medically necessary.

Adolescent↗
PubMed1976

Theatre pollution control.

Pollution control should be simple, cheap and effective. It should not introduce further hazards to the patient nor significantly complicate the practice of anaesthesia. These goals are attainable using a simple passive system. Convenience in use is enhanced by a concentric tubing system which allows effluent gases to be collected at the machine end and exhausted to the exterior. The additional expiratory resistance is minimal.

Air Pollution↗