A burn injuries

A burn injuriesInterpretation Exercise cut injuries are about often ca engrossd when the skin comes in direct contact with a naked ignite or a hot surface. Scalding can occur when there is contact with a hot liquid. thither are several other types of fire such as chemical, caused by strong acids or bases, and radiation, the almost comm just now known example being sunburn from UV light.Burns are classified by stage, where severity increases with a higher degree. A newer classification system separates burns into three categories superficial, partial weightiness and full thickness burns. The affected role in the scenario has a full thickness third degree burn. This unremarkably results in loss of the outer skin layer ( shell) causing the patients skin to be numb and chance hard and leathery to the touch. This degree of burn requires immediate medical attention as they do not heal on their own. Proteins at the site of injury denature and cells eventually die, marked by the fo rmation of black eschar at the centre of the wound. Once the skin barrier has been broken, the homeostatic functions of the skin are lost. there is rapid loss of body fluid and blood plasma which can sometimes cause palpable swelling.As the skin is the bodys first line of defence, burn wound infections correlate with the size of the burn injury. The epidermis constantly sheds off and takes harmful bacteria with it. Further more(prenominal), the acidic nature of the skin prevents the entry of microorganisms that generally cull neutral conditions. Burns are also associated with a depressed immune response. Given this information, it is no wonder that infection is the principal cause of death in burn victims. As it is a third degree burn, the patient willing hasten spent some time in hospital where there is a greater risk of infection. Patient to patient contact via hospital equipment and staff allows rapid transmission of infective bacteria. The burn wound is a favourable site f or opportunistic colonization by pathogens because the eschar provides a moist, protein well-situated environment which encourages bacterial ontogeny. The excess of necrotic tissue provides a rich harvest medium for the microorganism.In the clinical presentation, the patient complained of fever, chills and an unpleasant smelling discharge from the burn wound. These are all signs of infection so the doctor was correct to prescribe the patient an antibiotic. However, on the basis of the array of microbiology data collected in the laboratory, the doctors choice of antibiotic was incorrect. A two week course of flucloxacillin 500mg was prescribed to the patient to be interpreted orally 4 times daily. Flucloxacillin is an antibiotic belonging to the penicillin group. It is used to treat infections caused by gram-positive bacteria, most commonly staphylococcusylococcus aureus. In the laboratory, the microscopic slide was examined under a microscope using the oil immersion lens. Rod shaped microorganisms were observed and they were stained a pink/red intensity. This indicates the bacteria present in the pus samples is gram negative. Therefore, flucloxacillin would hand no therapeutic effect to the patient as it is only antiseptic against gram-positive cells.The three agar plates were examined and observations on the colour, shape, size and smell of the colonies was noted. There was no visible growth on the Mannitol salt agar (MSA) plate. This type of selective agar is used to isolate Staphylococcus aureus as it inhibits most other bacteria due to its high sodium chloride intentness (7.5 %w/v). The absence seizure of growth on the MSA plate provides further evidence that there is no Staphylococcus aureus colonisation in the patient.The colonies on the cetrimide agar were a pale, cloudy brown colour and gave off the smell of rotting fruit. The use of cetrimide agar as a selective and derived function agar allows for the isolation of Pseudomonas aeruginosa, a negative microorganism. Cetrimide is an ammonia compound which inhibits most bacteria, including some Pseudomonas species (but not P. aeruginosa). It also enhances production of the pigment pyocyanin which results in bright green colonies. However, some strains of P. aeruginosa do not produce the pigment. The growth on this plate support the pathogen present in the patient is Pseudomonas aeruginosa and the colourless colonies indicate it is a non-pigment producing strain.There was also growth on the MacConkey agar where the colonies were somewhat colourless but had an o turn tail tinge. MacConkey agar is a selective differential medium used to identify gram-negative bacteria and determine whether they are milk sugar fermenters. Fermenters appear as bright red colonies whilst non-fermenters are relatively colourless. As there was growth on this plate, the microorganism is unquestionably gram-negative but not a fermenter due to the absence of red colonies. P. aeruginosa does not ferment lactose which explains the colour of the colonies.An oxidase test was carried out which gave a positive result, indicated by a deep blue colour at the end of the test stick. An oxidase positive microbe consumees the enzyme take in the final stage of ventilating system to form metabolic water. Only aerobic or facultatively anaerobic microorganisms give a positive result. This biochemical test presents further evidence that P. aeruginosa is the infection causing bacteria because it is an obligate aerobe and therefore possess the cytochrome oxidase enzyme. strain bottles containing growth medium, a bacterial culture and an antibiotic at five different concentrations (all in g/ml) were observed. Cloudy store dilutions indicated the bacteria was resistant and was able to grow. Clear broth dilutions showed the bacteria was sensitive to the antibiotic and its growth was moderate. The bacteria was resistant to erythromycin at all concentrations used (1.25-20g/ml). Erythromycin is a macrolide antibiotic related to penicillin. The results indicate it would ware no therapeutic effect if prescribed to the patient. Amoxicillin showed healthful activity against the microorganism at concentrations of 20g/ml and 40g/ml. However, at concentrations above 12g/ml, the bacterium is considered resistant to amoxicillin so it has no therapeutic effect to the patient. Penicillins do not seem to have significant antimicrobial effects for this pathogen which shows the doctor was incorrect in his prescription of flucloxacillin as it is too a member of the penicillin group. The dose of 500mg will unlikely be high fair to middling to be beneficial and any therapeutic doses would be at too high a concentration and therefore impractical.Cefuroxime, a second contemporaries cephalosporin, was effective at concentrations of 16g/ml and 32g/ml. Again, this was above the intermediate concentration range so does not benefit the patient. A newer generation cephalosporin may need t o be used as they provide coverage against a broader spectrum of bacteria. The broth dilution containing ticarcillin was clear at concentrations of 8g/ml and 16g/ml. The intermediate concentration range for this do drugs is 10-20g/ml so the minimum inhibitory concentration is 8g/ml. This drug is a carboxypenicillin a sub group of the penicillin family. The bacteria showed moderate sensitivity to the drug but only at fairly high concentrations. Amikacin was also effective below its intermediate range (6-10g/ml) and inhibited bacterial growth at concentrations of 4g/ml, 6g/ml and 8g/ml. Amikacin is an aminoglycoside and is a suitable antibiotic to use against this pathogen as it showed high sensitivity to the drug.The doctors choice of antimicrobial therapy will not be beneficial to the patient as flucloxacillin is effective against gram-positive bacteria only and the patient is infected with gram-negative P. aeruginosa. Unnecessary use of this antibiotic could cause bacterial resist ance. P. aeruginosa is naturally resistant to a wide range of antibiotics and thus infections where it is the causative agent can be difficult to treat. Broad-spectrum agents are required as they are the only drugs which provide coverage against the bacteria. The patient could be treated with an aminoglycoside such as amikacin. Gentamicin could also be used but the experimental data shows the pathogen is definitely sensitive to amikacin and studies have found that P. aeruginosa is more likely to develop resistance to gentamicin than amikacin. Aminoglycosides are bactericidal and act by interfering with the bacterial ribosome, leading to incorrect reading of messenger RNA. This would be used along with a third generation cephalosporin such as ceftazidime. Carboxypenicillins could also be used (e.g. ticarcillin) but they have only moderate activity against Pseudomonas species and research has shown that bacteria quickly develop resistance to them. threesome generation cephalosporins provide coverage against P. aeruginosa, unlike 1st and 2nd generation which have a more limited spectrum of activity. They are also bactericidal and exert their effect by interfering with cell surround synthesis. Although there is no significant evidence of the benefits to using the two drugs in combination, it is rational to do so as it prevents the emergence of mutant genes resistant to one of the agents. Both drugs are also thought to have a synergistic effect when used together. Neither of these drugs are absorbed via the gastrointestinal tract so must be administered via the parenteral route. Amikacin is wedded via intramuscular injection at a dose of 15mg/kg daily in two divided doses. The dose must be decided carefully as high levels of amikacin in the blood stream can cause damage to the ear (ototoxicity). Ceftazidime is given by intravenous infusion at a dose of approximately 2g every 12 hours, depending on the severity of the infection.In summary, the available microbiol ogy data indicates that the doctors presumptive diagnosis was incorrect and that the patient has a burns infection caused by Pseudomonas aeruginosa. The absence of growth on the MSA plate disproved the idea of a staph aureus related infection. Gram-negative rods observed on the slide and growth on the MacConkey agar clarified that the microorganism was gram-negative. Growth on the cetrimide agar plate confirmed the presence of Pseudomonas aeruginosa in the patients pus sample. trial run of the broth dilutions helped determine a suitable combination of antibiotics for the patient to take. These would be need therapeutic and possess antimicrobial activity against the pathogen, unlike the doctors prescription of flucloxacillin. Use of a third generation cephalosporin with an aminoglycoside should efficaciously clear up the infection in the patient following completion of the course of antibiotics.