Web watch.
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Biomedical subjects
Publications and source records attributed to R K Lau.
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The Internet provides a rapid facility for accessing a large amount of information which, once found, can be manipulated in a variety of ways. For example, with the authors' permission, Web pages can be retrieved, converted into text files and edited to produce patient leaflets of sexually-transmitted conditions, prescribing information leaflets, clinical guidelines and protocols, etc. Collections of relevant Web sites placed in bookmarks on a Web browser for students to refer to could also form the basis for self-directed learning, and tutorials and small group teaching on specific subjects.
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Gonococcal eye infection in adults is an uncommon cause of blindness, where prompt diagnosis and effective treatment are essential in the prevention of ophthalmic morbidity. We present a case report detailing the management and complications encountered in this condition in a patient coinfected with human immunodeficiency virus (HIV).
Epstein-Barr virus is an important aetiological factor in certain HIV-related syndromes, with its opportunist expression related to the level of host immunodeficiency. In asymptomatic people co-infected with HIV, EBV activity is reflected by increased viral shedding and rises in anti-EBV titres; as immunodeficiency ensues EBV manifests as epithelial hyperproliferation in OHL, and later as B-cell lymphoma in AIDS. The suggested role of EBV as a co-factor in the progression of HIV infection and development of AIDS has not been established, although another herpesvirus, cytomegalovirus, might play such a role. Advances in our understanding of HIV regulation and its interaction with other latent (herpes) viruses should provide important molecular and pharmacological approaches to the clinical management of advanced HIV disease.
To assess the clinical and laboratory workload arising from human immunodeficiency virus (HIV)-related inpatient admissions in a London teaching hospital, a 10-month retrospective audit was performed of the casenotes of all HIV-infected inpatients admitted under the care of one consultant physician. During this period, 84 inpatients were identified who generated 371 admissions, of whom 71 (84.5%) had acquired immunodeficiency syndrome (AIDS). Over two-thirds of admissions were essentially day cases, attributed to blood transfusions, antimicrobial and tumour, chemotherapy, and minor surgery; with blood transfusions alone accounting for 43% of all admissions. Pulmonary infections (pyogenic and cell-mediated opportunist) accounted for 46 (12%) of admissions, with Pneumocystis carinii pneumonia second only to blood transfusions in caseload prevalence score (see below). Neurological complications of AIDS were associated with the longest admissions. Laboratory-based investigations were heavily utilized by AIDS inpatients, particularly bacteriological services. Choice of radiological investigation correlated with the anatomical site of disease presentation: plain radiology for chest symptoms, ultrasound for abdominal symptoms and computerized tomography (CT scanning) for neurological presentations. Drug-induced anaemia accounted for a substantial number of HIV-related admissions for red cell transfusions, which together with the disproportionate workload from daycase-type admissions, might be better handled in lower dependency day wards.
Three hundred and fourteen homosexual/bisexual men at risk for human immunodeficiency virus (HIV) infection (170 seroprevalent HIV-positive, 144 seronegative) were prospectively studied over 8 years to assess rates of HIV infection and disease progression, in conjunction with cellular and HIV serological markers. In HIV-positive subjects, CD4+ lymphocyte counts rose strikingly during the period surrounding seroconversion, then fell progressively over the intervening period to a mean level of 300 cells/mm3 when AIDS developed. Changes in CD8+ lymphocyte counts were less consistent. The trend for HIV serological markers over the study period was of progressive decline in the proportion of subjects with anti-p24 antibody, associated with an increase in the proportion of subjects with detectable HIV antigenaemia. However, only 45% of subjects tested had lost anti-p24 antibody by the time of AIDS diagnosis, and HIV antigen was detectable up to 4 years before this. Different HIV serological patterns were also observed in subjects presenting either with Kaposi's sarcoma or opportunist infections. Our data support the continued use of cellular and virological markers in the evaluation of HIV disease; however, the variability observed in this study highlights their limited ability in predicting specific clinical events. Care should therefore be taken to encompass both clinical and laboratory information in the medical assessment of the HIV-infected individual.