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Biomedical subjects

T F Cheung

Publications and source records attributed to T F Cheung.

5 recordsLinked to original sources
PubMed2000

Endobronchial actinomycosis associated with a foreign body.

Primary endobronchial actinomycosis is an exceedingly rare condition which closely mimics bronchial carcinoma both clinically and radiologically. We report the case of a middle-aged Chinese man who had right lower lobe endobronchial actinomycosis associated with inhalation of a presumed chicken bone. The patient made a complete clinical and radiological recovery after a 2 month combined course of amoxycillin and clavulanate, after removal of the foreign body, which was only detected after using contiguous computed tomography. Our experience in the management of this patient should help clinicians in the investigation and management of this rare but treatable condition.

Actinomycosis↗
PubMed1998

Phytoestrogens: dietary intake and excretion in postmenopausal Chinese women.

OBJECTIVES: The aims of this study were to estimate the dietary intake of phytoestrogens and to measure urinary phytoestrogen excretion in postmenopausal Chinese women. METHODS: Postmenopausal Chinese women were recruited from the hormone replacement clinic of the Prince of Wales Hospital. Dietary intake of phytoestrogen-rich foods was estimated using a food frequency questionnaire. Urinary output of the isoflavonoids daidzein and genistein and the metabolite of daidzein, equol, was measured using high-performance liquid chromatography. RESULTS: The mean daily excretion of daidzein, genistein and equol was 3.24 (+/- 3.63), 1.47 (+/- 1.75) and 0.64 (+/- 1.53) mumol, respectively. The total mean daily isoflavonoid excretion was 5.36 (+/- 5.27) mumol. CONCLUSIONS: Urinary excretion of isoflavonoid phytoestrogens in this Chinese population was lower than that reported in Japanese subjects. This may be due to the higher consumption of legumes, especially soy products, in the Japanese compared to the Chinese diet. The intake of green vegetables was higher in the Chinese subjects, and this food group may be the main contributor to their total phytoestrogen intake.

Adult↗
PubMed1997

Database and quick methods of assessing typical dietary fiber intakes using data for 228 commonly consumed foods.

To promote assessment of dietary fiber intakes in clinical settings, we established two objectives for this study: to provide a detailed database in grams per serving of fiber content and polymer composition for most fiber sources in the US diet, and to develop a quick method for estimating total fiber intakes. Data for 342 foods were condensed to 228 foods by combining similar foods. The comprehensive database developed includes pectin, hemicelluloses, and beta-glucan contents of the soluble and insoluble fractions of fiber and the cellulose and Klason lignin contents of the insoluble fiber. Three fourths of the 228 foods contained 2.0 g fiber per serving or less; only 10% contained more than 3.0 g per serving. The quick method consists of multiplying the number of servings in each food group by the mean total dietary fiber content of foods in that group: 1.5 g for fruits (n = 43), 1.5 g for vegetables (n = 68), 1.0 g for refined grains (n = 80), and 2.5 g for whole grains (n = 13). Actual fiber values from the database should be used in the quick method if foodstuffs concentrated from grains, legumes, and nuts and seeds are consumed. Sample menus demonstrate that quick assessment of total fiber intake yielded results similar to the sum of individual values from the database.

Databases, Factual↗
PubMed1993

N-hexane neuropathy in offset printers.

In an offset printing factory with 56 workers, 20 (36%) developed symptomatic peripheral neuropathy due to exposure to n-hexane. Another 26 workers (46%) were found to have subclinical neuropathy. The initial change in the nerve conduction study was reduced amplitude of the sensory action potentials, followed by reduced amplitude of the motor action potentials, reduction in motor conduction velocities and increase in distal latencies. These changes indicate primary axonal degeneration with secondary demyelination. Sural nerve biopsy in a severe case showed giant axonal swellings due to accumulation of 10nm neurofilaments, myelin sheath attenuation and widening of nodal gaps. The development of neuropathy bore no direct relationship to the duration of exposure, hence factors such as individual susceptibility may be important. Optic neuropathy and CNS involvement were uncommon and autonomic neuropathy was not encountered.

Adolescent↗