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Biomedical subjects

M A Lewis

Publications and source records attributed to M A Lewis.

At least 181 records · Page 10Linked to original sources

Consequences of empowering children to care for themselves.

The social climate of the past 3 decades has resulted in an increased interest in empowering children to participate in their own health care. Research conducted over the past 18 years by the authors suggests that children are quite competent to enter into programs that are child-centered and family-oriented, whose objectives are to teach children decision making, and to transfer increasing control over decision making related to health matters to the child. These studies indicate that children learn decision-making skills, and apply them quite competently, especially when the scope of decision making is clearly defined. Despite the evolution of programs that have been demonstrated by randomized control trials to effectively reduce the utilization of emergency rooms and hospitals by children with asthma, such programs have not diffused widely, not even into pre-paid health plans. Experience with two such programs indicates that the principle resistance to diffusion derives first from physicians, who are reluctant to share power with adult patients, let alone children, and even some of the parents themselves whose roles are threatened by such efforts.

Child↗

Oral medicine in practice: viral infection.

The fourth article in this series deals with viral infections which may present in the dental surgery. Two groups of viruses, herpes and coxsackie, are responsible for the majority of viral conditions involving the orofacial region which present to the dentist. Mucosal ulceration is the most frequent clinical presentation, although viruses may also be responsible for salivary gland swelling or epithelial hyperplasia. Diagnosis of viral infection is important, since treatment which can alleviate symptoms and reduce the likelihood of spread of infection is available. In addition, the recognition of intra-oral viral infection can have serious implications, since it may be an indication of underlying conditions such as leukaemia, HIV infection or child abuse.

Adult↗

Oral medicine in practice: burning mouth syndrome.

The GDP, in liaison with medical colleagues, has much to offer patients who suffer BMS. It is important that the history is gained in an unhurried and sympathetic clinical environment, along with subsequent investigations. With such an approach, it is possible to successfully treat the majority of patients with BMS, a condition which at first may seem a very difficult problem to manage.

Burning Mouth Syndrome↗

Oral medicine in practice: oral ulceration.

There are many causes of oral ulceration, but diagnosis should be relatively straightforward following an adequate history, examination and investigation. If the ulceration fails to respond to treatment, or has an unusual appearance, then an underlying systemic problem such as myeloproliferative disease or HIV infection has to be considered.

Carcinoma, Squamous Cell↗

Oral medicine in practice: angular cheilitis.

In a series of twelve articles the authors aim to cover the more common oral medicine problems likely to be encountered in dental practice. Whenever possible, clinical photographs have been used to illustrate important points, and the text is deliberately succinct and without references. In the first article, the pathogenesis, investigation and management of angular cheilitis is reviewed.

Cheilitis↗

Analytical potential of protein A for affinity chromatography of polyclonal and monoclonal antibodies.

Protein A based rapid affinity chromatography for quantitation of various immunoglobulins of class G (IgG) is described. Three-minute analysis using either citrate or phosphate buffers and detection with 220- or 280-nm ultraviolet absorption was found to be optimum for quantitation of IgG from 0.25 to 250 micrograms of IgG on-column with a percent relative standard deviation (% RSD) of 2-3% RSD. The method has a detection limit estimated to be 100 ng of IgG on-column. It has been used to analyze a variety of IgG-containing samples from such diverse sources as hybridoma selection, media cultivation, and purification studies. Gradient elution studies and the relationship of IgG elution to IgG isoelectric point (pI) are also described.

Animals↗

Recurrent erythema multiforme: a possible role of foodstuffs.

Seven patients are described, who presented with a history of recurrent episodes of erythema multiforme and who were subsequently found to be sensitive, by patch testing, to benzoic acid. Advice on avoidance of benzoic acid resulted in resolution of attacks in four patients, but three patients who were not able to adhere to an exclusion diet continued to have symptoms. These findings implicate benzoic acid, a food preservative, as an aetiological factor in erythema multiforme. It is proposed that patch testing to food substances should be carried out on patients who present with recurrent erythema multiforme, since avoidance of potential allergens may lead to resolution of symptoms.

Adolescent↗

Treatment of candidal leukoplakia with fluconazole.

A case of candidal leukoplakia (chronic hyperplastic candidosis) treated with the systemic antifungal agent, fluconazole, is reported. Dramatic clinical and histopathological resolution of the condition occurred following 11 days of drug therapy.

Antifungal Agents↗

Nephrotic syndrome: from toddlers to twenties.

63 patients with steroid-sensitive, biopsy-proven minimal-change nephrotic syndrome were followed for between 10 and 21 years. 2 died. All the survivors had normal renal function and blood pressure, and only 2 had a single attack. Frequent relapse was more common with young age of onset and in boys. The frequency of relapse fell rapidly over the first 4 years after diagnosis and then plateaued. Relapses continued into adult life. No definite endpoint to the disease could be defined although there was a linear relation between length of remission and risk of subsequent relapse.

Adolescent↗

Presentation and antimicrobial treatment of acute orofacial infections in general dental practice.

Information on the presentation of orofacial infections and the use of antimicrobial agents in general dental practice in the United Kingdom was obtained using a postal questionnaire. Six hundred dentists were randomly selected and a total of 340 replies were received, giving a response rate of 57%. The dental practitioners estimated that acute infection was present in only a minority (approximately 5%) of patients. A total of seven different antibiotics were prescribed, in a variety of regimens, for the treatment of bacterial infection. However, the majority of dentists (46-62%) preferred a 5-day course of penicillin (250 mg, qid) for bacterial conditions other than acute ulcerative gingivitis, for which most practitioners (89%) prescribed 3 days of metronidazole (200 mg, tid). Nystatin was the most frequently selected anticandidal agent and topical acyclovir the most popular therapy for Herpes simplex infection.

Anti-Bacterial Agents↗

An epidemiological model with a delay and a nonlinear incidence rate.

An epidemiological model with both a time delay in the removed class and a nonlinear incidence rate is analysed to determine the equilibria and their stability. This model is for diseases where individuals are first susceptible, then infected, then removed with temporary immunity and then susceptible again when they lose their immunity. There are multiple equilibria for some parameter values, and, for certain of these, periodic solutions arise by Hopf bifurcation from the large nontrivial equilibrium state.

Epidemiologic Methods↗

Quantitative bacteriology of a case of acute parotitis.

It is generally assumed that the microorganisms responsible for acute suppurative parotitis are facultative anaerobes, primarily Staphylococcus aureus and Streptococcus viridans. A quantitative microbiologic investigation of an aspirate of pus from the case we report revealed a microbial flora (5.1 X 10(6) CFU/ml) consisting entirely of strict anaerobes (Fusobacterium nucleatum and Peptostreptococcus anaerobius). The strain of F. nucleatum was sensitive to metronidazole but resistant to penicillin, amoxicillin, and erythromycin (minimum inhibitory concentration greater than 16 micrograms/ml). P. anaerobius was sensitive to the antibiotics tested. It is concluded that a high concentration of viable anaerobic bacteria may be present in acute suppurative parotitis and thus pus obtained from cases of sialadenitis should be cultured with microbiologic methods capable of isolating strict anaerobes. Additionally, antibiotic sensitivity should be determined routinely.

Acute Disease↗

Antibiotic susceptibilities of bacteria isolated from acute dentoalveolar abscesses.

The antibiotic susceptibilities of 166 bacterial strains (43 facultative anaerobes and 123 strict anaerobes) cultured from 50 acute dentoalveolar abscesses was assessed. Firstly, the effectiveness of five antibiotics, penicillin, amoxycillin, erythromycin, clindamycin and metronidazole, which are available to treat acute dental infection, was studied using a Stokes' comparative disc diffusion method. Secondly, the minimum inhibitory concentrations and minimum bactericidal concentrations were determined for isolates of the predominant species, especially those strains deemed resistant by the Stokes' method. It was concluded that the vast majority of bacterial strains (96%) were sensitive or moderately sensitive to the antibiotics tested. However, resistance was recorded for each of the antibiotics tested on at least one occasion. The MIC of penicillin, presently the drug of choice for acute dental infection, was between 0.03 and 2 mg/l for the majority of strains (96%).

Acute Disease↗

Case mix and outcomes of nursing home patients. The importance of prior nursing home care and admission from home versus hospital.

The authors compared the personal characteristics, measures of functional status/case mix, and discharge outcomes of nursing home patients admitted to skilled nursing facilities (SNFs) in 1984 for the first time (first admissions) to those of patients with a prior history of nursing home care (readmissions). Compared to first admissions, readmitted patients were more disabled and debilitated, significantly less likely to return home, and more likely to be hospitalized. History of a prior nursing home admission is an important indicator of prognosis, service needs, length of stay (LOS) of patients in the nursing home, and their discharge outcomes. Location before admission--home versus hospital--was associated with case-mix descriptors and LOS but was unrelated to discharge outcomes, except for those readmitted from hospitals, who returned home less often and were more likely to die in the SNFs.

Activities of Daily Living↗

Educational outcomes and illness behaviors of participants in a child-initiated care system: a 12-year follow-up study.

Young adults who participated as children in a study of child-initiated care from 1972 to 1974 and their parents were studied again in 1986. More than 80% of all parents were located and interviewed. Of the 260 young persons located, 71% responded to a questionnaire. Although there was no significant association between being a frequent user of health care in either 1972 to 1973 or 1973 to 1974 and use of care 12 years later, girls who or 1973 to 1974 and use of care 12 years later, girls who were consistently frequent care users in both school years had a similar pattern of use as young women in 1986. Frequent users as children and young adults had a greater prevalence of headaches and stomachaches, but at both ages boys were less likely to seek care when faced with complaints or perceived health problems. A significant association was found between consistently frequent care use as a child and subsequent academic problems as a young adult. The importance of identifying children with chronic complaints (unrelated to physical causes) and helping them to deal with the true sources of their distress are emphasized by the data.

Adult↗

Assessment of the pathogenicity of bacterial species isolated from acute dentoalveolar abscesses.

The pathogenicity of 20 strains belonging to nine bacterial species isolated from acute dentoalveolar abscesses was assessed individually and in two species combinations by subcutaneous inoculation of mice. Infections were produced by all the bacteria although variations were seen both in the type of lesion produced and the subsequent recovery of viable bacteria. Anaerobic gram-negative bacilli were recovered more often (p less than 0.05) at high concentrations (10(6)-10(9) cfu/ml) and produced a localised abscess with peripheral necrosis more frequently (p less than 0.001) than either Streptococcus milleri or anaerobic gram-positive cocci. Lesions induced by a combination of bacteria comprising anaerobic gram-negative bacillus and any other species yielded both strains at high concentration more often (p less than 0.001) than a combination comprising anaerobic gram-positive cocci and S. milleri. It is concluded that anaerobic gram-negative bacilli are major pathogens in acute dentoalveolar abscesses.

Acute Disease↗