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Biomedical subjects

L S Nakhla

Publications and source records attributed to L S Nakhla.

15 recordsLinked to original sources

Randomized placebo-controlled trial of teicoplanin in the antibiotic prophylaxis of infection following manipulation of burn wounds.

BACKGROUND: Burn wound surgery or change of dressings commonly causes bacteraemia. The use of antibiotic prophylaxis has not been tested adequately in a controlled trial. METHODS: A randomized double-blind placebo-controlled study was performed to determine the effect on Gram-positive bacteraemia and clinical outcome of a single dose of teicoplanin (12 mg/kg intravenously) given at burns surgery or change of dressings. RESULTS: A total of 134 patients were entered into the study, representing 220 episodes of dressing or debridement (110 episodes in each group). There was a significant difference between the groups with respect to perioperative Gram-positive bacteraemia: eight episodes (7 per cent) in the teicoplanin group versus 51 (46 per cent) in the placebo group (P < 0.001). However, good clinical outcome was similar in both groups (80 of 110 versus 77 of 110 respectively, P = 0.7). Only eleven patients had bacteraemia caused by Gram-negative species alone. Bacteriological response in terms of wound culture showed no significant difference between the groups: 63 (57 per cent) of 110 episodes versus 58 (53 per cent) of 110 respectively respectively. CONCLUSION: Prevention of Gram-positive bacteraemia did not affect postoperative recovery.

Adult↗

Microbiological aspects of burns at Mount Vernon Hospital, UK.

Bacterial infection in 100 burned patients over a 10-month period has been studied. The commonest colonizing organism was Staph. aureus (69 per cent), followed by E. coli (35 per cent). Pseud. aeruginosa accounted for only 28 per cent of isolates. The role of the different bacterial species in burns pathology is discussed. Group G haemolytic streptococci were isolated from 10 per cent of patients and caused graft failure in some cases. Only 3 per cent of patients developed septicaemia and all were due to Staph. aureus. Our approach to management of infection in burns, especially the policy on systemic antimicrobial chemotherapy, is described.

Anti-Infective Agents↗

A serological method for distinguishing coagulase-negative staphylococci from micrococci.

Absorbed antisera prepared against heat-killed suspensions of a coagulase-negative staphylococcus and of a micrococcus were used in a slide-agglutination test. A collection of 176 coagulase-negative aerobic cocci, from which Staphylococcus aureus had been excluded, was classified into staphylococci and micrococci by means of the test for anaerobic utilization of glucose. Of 113 staphylococci, 99 reacted with the anti-staphylococcus serum, seven with the micrococcus serum, and seven with neither; of 63 micrococci, 55 reacted with the micrococcus serum and eight were untypable. Thus 161 of 176 strains (91%) were classifiable serologically, and in 154 of 161 instances (95%) the results of the serological and biochemical classification were in agreement.

Absorption↗

Genetic determinants of trimethoprim resistance in a strain of Staphylococcus aureus.

Trimethoprim resistance was transduced from a resistant to a sensitive strain of Staphylococcus aureus by means of a cell-free phage lysate of the resistant strain. The resistance acquired by the sensitive strain was stable and could not be eliminated by growth at an elevated temperature or in the presence of acridine or ethidium bromide. This stability and the kinetics of transduction by ultraviolet-irradiated phage suggest that resistance to trimethoprim in Staph. aureus is determined by a chromosomal rather than a plasmid gene.

Acridines↗

Resistance of Staphylococcus aureus to sulphamethoxazole and trimethoprim.

Strains of Staphylococcus aureus isolated from the lesions of hospital patients were surveyed for resistance to sulphamethoxazole and to trimethoprim. Of 675 strains tested, 18.5% were resistant to sulphamethoxazole and 1.6% to trimethoprim. All the trimethoprim-resistant strains were resistant to sulphamethoxazole and to a 1:20 mixture of the two drugs. Trimethoprim-resistant strains were on average more resistant to sulphamethoxazole than were trimethoprim-sensitive strains. They were all resistant to several other antimicrobial agents. Most of them had the phage-typing pattern 84/85, 84, or 85.

Anti-Bacterial Agents↗