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Biomedical subjects

T T Ho

Publications and source records attributed to T T Ho.

9 recordsLinked to original sources

Indinavir-associated facial lipodystrophy in HIV-infected patients.

The objectives of this study were to document the prevalence of facial lipodystrophy in patients with HIV infection receiving protease inhibitors and to identify associated factors. All patients with HIV infection receiving protease inhibitors seen at an HIV clinic in Hong Kong during a 2-month period, from August to October 1997, were assessed for facial lipodystrophy. Among 29 patients who had been receiving indinavir for 3 months or more, facial lipodystrophy was found in 7 (24%). Facial lipodystrophy in these patients was found to be an isolated event and was not associated with noticeable wasting elsewhere. The development of facial lipodystrophy was not found to be associated with age, sex, ethnicity, route of HIV transmission, CD4 cell count, history of AIDS-defining illness, or concurrent anti-retroviral treatment. Facial lipodystrophy was not observed in patients who had received indinavir for less than 3 months. The condition was also not found in patients taking other protease inhibitors, although this could be due to the small sample size. Prospective study of this condition with a larger sample and with objective anthropomorphic measurements would be desirable. In conclusion, facial lipodystrophy is a common occurrence among patients receiving indinavir, and physicians should be alerted to this condition.

Adult↗

Low yield of chest radiography in screening for active pulmonary tuberculosis in HIV-infected patients in Hong Kong.

This study assessed the usefulness of routine chest radiography for detecting active pulmonary tuberculosis in persons infected with human immunodeficiency virus (HIV) without suggestive symptoms in Hong Kong. Tuberculosis is common in this locality and tuberculosis/HIV co-infection has been a frequent and significant problem. Records of patients attending the largest HIV clinic were reviewed. Three hundred and eleven routine chest radiographs were performed among 191 HIV-infected patients with a total follow-up period of 792 person years. Of the 22 routine chest radiographs that had abnormalities in the lungs or hilar region, only one had led to the diagnosis of pulmonary tuberculosis. No patient with a normal chest radiograph was diagnosed to have tuberculosis within the following 2 months. The low yield (0.32%) suggests that routine chest radiography is not useful in screening for active pulmonary tuberculosis in asymptomatic HIV-infected patients even in a locality where the tuberculosis rate is high.

AIDS-Related Opportunistic Infections↗

HIV-associated eosinophilic folliculitis in a Chinese woman: a case report and a survey in Hong Kong.

This is the first survey of eosinophilic folliculitis (EF) in patients infected with the human immunodeficiency virus (HIV) in Hong Kong. The present report provides the local data on HIV-associated eosinophilic folliculitis (HIV-EF) and includes the first Chinese, heterosexual female patient with this condition. This is a retrospective study on all HIV-positive patients (n = 451) attending the outpatient clinic of the AIDS Unit in Hong Kong. Patients diagnosed as having EF with histological support were included for analysis. The data were presented by descriptive method. Three patients were identified, all of them had skin biopsies done which confirmed the diagnosis; including the female case. Recognition of HIV-EF is important because it is indicative of significant immunosuppression with risk of opportunistic infection. We concluded that HIV-EF is no longer an exclusive male disease in homosexual patients only. We expect more female patients or heterosexual subjects who are HIV positive developing this disease in the future.

Adult↗

Evaluation of leukocyte differential counts on the QBC centrifugal hematology analyzer according to NCCLS standard H20-T.

A performance study of the QBC centrifugal hematology system was conducted according to reference and analytical procedures defined in NCCLS Tentative Standard for Leukocyte Differential Counting, H20-T. A complex mathematical transformation and analysis of variance (ANOVA) were applied to the test data. This statistical technique is intended to segregate and emphasize differences in samples and methods. The comparative study of leukocyte differential counts show that QBC is equivalent in performance to the NCCLS reference method when the latter counts are grouped according to the WBC subpopulations reported by QBC. Within these grouped subpopulations, QBC counts were more precise than manual reference counts and otherwise comparable in terms of results. Similarly, QBC compared favorably with the reference method in its clinical sensitivity to abnormals, based on between-method versus within-method studies of hospital specimens.

Biometry↗

Improved radioimmunoassay of platelet factor 4 and beta-thromboglobulin in plasma.

We describe rapid radioimmunoassays for both platelet factor 4 (PF-4) and beta-thromboglobulin (beta-TG) on the same plasma sample with use of pre-precipitated second antibody for the separation step. The assays are sensitive (B/B0 of 90% is obtained with 30 pg PF-4 and 100 pg beta-TG), specific, accurate, and reproducible. Labeled antigens are highly immunogenic, stable, and require no initial or periodic purification. Both assays require less than five hours for precount incubation times and can easily be completed in one day. Normal plasma values for PF-4 and beta-TG were 2.98 ng/ml and 25.83 ng/ml, respectively.

Animals↗

Pre-precipitated and solid-phase second antibody compared in radioimmunoassay.

We describe simple methods for preparing and determining the titer of pre-precipitated second antibody. We compared the performance of this type of insolubilized second antibody with that of a commercially available solid-phase second antibody (DASP) for separation of reverse triiodothyronine (rT3) and for thyrotropin radioimmunoassays. Equilibrium time for both reagents was about 30 min, considerably briefer than for the usual second-antibody procedure. Within-assay precision was improved and percentages of nonspecific binding (mean and SD) were lower if pre-precipitated second antibody was used in both assays [rT3 pre-precipitate = 1.48 (SD 0.16), rT3 DASP = 3.76 (SD 0.22); thyrotropin pre-precipitate = 1.45 (SD 0.18), thyrotropin DASP = 3.45 (SD 0.26)]. The cost of DASP was three to 10 times that of pre-precipitated second antibody prepared with commercially available products.

Antibodies↗

[Porphyria].

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5-Aminolevulinate Synthetase↗