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Biomedical subjects

A C Chan

Publications and source records attributed to A C Chan.

241 records · Page 14Linked to original sources
PubMed1976

The management of typhoid fever.

The diagnosis of typhoid fever requires clinical alertness and ready laboratory support, blood cultures being most important. Chloramphenicol remains the standard drug specific for acute typhoid fever while cotrimoxazole is a useful alternative. Both of these are also useful in the treatment of relapses. The importance of supportive treatment cannot be over-emphasized. The treatment of intestinal complication is mainly conservative. Steroid is useful in the toxic delirious state. The management of chronic typhoid carriers is still an unsolved problem. To exclude the chronic carriers from handling food and to give advice on meticulous attention to personal hygiene is still the best way of public health control.

Ampicillin↗
PubMed1975

DNA synthesis in L-cells in the presence of 5-fluorodeoxyuridine.

After 16 h of incubation with 10-minus6 M FdUrd, the rate of (32P) orthophosphate uptake into DNA isolated from L-cells amounted to 15% of that of an untreated culture, although cell division had stopped several hours earlier. All 4 deoxynucleotides were present in this DNA but its nucleotide composition, as measured by enzymatic digestion and chromatography, reflected a decreased thymidine precursor pool in FdUrd-treated cells. Sedimentation analysis in alkaline sucrose gradients revealed that the DNA formed in the presence of FdUrd had a sedimentation coefficient of 10 S which corresponded to a single-stranded molecular weight of 5.5.105. This DNA could be "chased" into a high molecular weight DNA if the FdUrd block was bypassed with added dThd or BrdUrd. Other analyses failed to detect RNA covalently linked to the DNA fragments at a level of more than 5% RNA or about 90 ribonucleotides. The accumulation of these DNA fragments could be explained by assuming that in the presence of limiting precursor pool the rate of DNA chain initiation is greater than the rate of chain elongation.

Animals↗
PubMedDate not supplied

The prognostic factors for peripheral T-cell lymphomas.

The peripheral T-cell lymphomas of 50 patients were classified by histological type and tumour cell size, the latter as described by the Nebraska Group. There was no difference in the pattern of their clinical features among the various histological subtypes and their clinical outcome was similar. Cell size and other factors including sex, age, presence of B symptoms, sites of primary disease, histological subtypes according to the Japanese classification, lactate dehydrogenase level and presence of bulky disease did not appear to correlate with clinical outcome. However, patients with stage IV disease had significantly lower CR rate (9/29 versus 16/21, p = 0.01) and poorer survival at 3 years (p = 0.05) than those with stage I, II and III disease. Patients receiving COPP, the less intensive chemotherapy regimen, appeared to have poorer clinical outcome but the difference observed was not statistically significant because of the number of patients in each subgroup.

Age Factors↗
PubMedDate not supplied

Hypoxia and tachycardia during endoscopic retrograde cholangiopancreatography: detection by pulse oximetry.

Oxygen saturation and pulse rate were recorded using pulse oximetry during 50 consecutive endoscopic retrograde cholangiopancreatography (ERCP) examinations. Oxygen saturation dropped to below 90% in 22 patients at some point during the procedure. Multiple regression analysis revealed that increasing age and weight were the most significant variables in predicting tachycardia or hypoxia. These problems cannot be reliably predicted or detected clinically. The use of a pulse oximeter during ERCP is recommended.

Adult↗