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R M Hedley

Publications and source records attributed to R M Hedley.

5 recordsLinked to original sources

Audit of transfer of head-injured patients to a stand-alone neurosurgical unit.

An audit was conducted of all serious head injured patients received at Atkinson Morley's Hospital over 1 year. One hundred and fifty-four were received, of whom 65 (42.2 per cent) had multiple injuries; 137 (89 per cent) patients were intubated and the overall incidence of hypoxia was 9.7 per cent. The incidence of hypercarbia was 25.9 per cent and was unrelated to the mode of ventilation. Hypotension was present in 11 patients (7.1 per cent) and hypovolaemia in 16 (10.5 per cent). During transfer 39 (28.9 per cent) intubated patients received no sedation, although 29 (21.5 per cent) were given neuromuscular blocking agents alone. The incidence of actual cervical injury was 3.2 per cent and in all five patients the neck was adequately stabilized pre-transfer. The incidence of thoracid injury was 19.5 per cent and of these four patients (13.3 per cent) warranted thoracotomy. Abdominal trauma occurred in eight (5.2 per cent) patients and in only one patient was laparotomy not performed pre-transfer. The accompanying doctor was a SHO with less than 6 months experience in anaesthetics in 33 per cent of transfers. Arterial blood pressure was monitored in only 50 per cent of transfers. The initial management of patients was generally satisfactory, and in particular the avoidance of hypoxia by a high rate of intubation was a significant improvement over other studies.

Abdominal Injuries↗

A comparison of the filtration properties of heat and moisture exchangers.

Heat and Moisture Exchangers are used increasingly as filters to prevent the contamination of breathing apparatus and to limit cross-infection. A series of laboratory tests has been developed to evaluate the microbial filtration and air flow resistance properties of these devices. The tests were designed to simulate the clinical situation and therefore evaluated devices in both dry and wet conditions. The devices tested (Engstrom Edith, Pall BB50T, Dar Hygrobac, Intersurgical Filtatherm and Intersurgical Filtaguard) were each representative of a particular type of construction. The simple hygroscopic device (Engstrom Edith) showed poor airborne and liquid-borne filtration efficiency, but its resistance to air flow remained low in all conditions. The composite devices (Dar Hygrobac, Intersurgical Filtatherm and Intersurgical Filtaguard), which all possessed relatively large pores, performed well in terms of dry airborne filtration efficiency, but showed substantial increases in air flow resistance and poor filtration efficiency in the presence of liquid. The pleated membrane filter (Pall BB50T), which possessed small pores, showed good airborne filtration efficiency and prevented the passage of liquid. The latter property enabled this device to prevent the passage of liquid-borne contamination and to maintain a low resistance to air flow in wet conditions. It would appear that in terms of contamination control and air flow resistance the pleated membrane filter provides a wider margin of safety than either the hygroscopic or composite devices.

Air↗