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Biomedical subjects

C L Goh

Publications and source records attributed to C L Goh.

At least 163 records · Page 9Linked to original sources
PubMed1989

Contact sensitivity to topical antimicrobials (I). Epidemiology in Singapore.

18% (571/3145) of patients attending a contact dermatitis clinic in Singapore had contact sensitivity to one or more topical antimicrobials. The rates in males and females were similar. The rate for patients under 50 years old was 16% and for those over 50 years old 30% (p less than 0.0001). There were no significant differences in the rates among Chinese, Malays, Indians and other races. The antimicrobials proflavine, neomycin and clioquinol were the commonest sensitizers.

Adolescent↗
PubMed1989

Contact sensitivity to topical antimicrobials. (II). Sensitizing potentials of some topical antimicrobials.

A predictive study comparing the sensitizing potentials of some topical antimicrobials, using a modified Beuhler's technique, showed that over-the-counter (OTC) antimicrobials were more sensitizing than prescribed topical antibiotics. Among OTC antimicrobials, proflavine was the most potent sensitizer (4/10 guinea pigs); parachlorometaxylenol, benzalkonium chloride and propamidine isethionate moderate sensitizers (2/10 guinea pigs); iodine a weak sensitizer (1/10 guinea pigs); and chlorhexidine and cetrimide very weak sensitizers (0/10 guinea pigs). Among prescribed topical antibiotics, neomycin was a moderate sensitizer (2/10 guinea pigs); gentamycin and chloramphenicol weak sensitizers (1/10 guinea pigs); kanamycin, clioquinol, polymyxin B, bacitracin, tetracycline, sodium fusidate and fusidic acid very weak sensitizers (0/10 guinea pigs). There was good correlation between sensitizing potentials in animal studies and clinical experience of contact allergy to these topical antimicrobials.

Administration, Topical↗
PubMed1989

An approach to the evaluation and documentation of adverse drug reaction.

This paper reviews an approach to the evaluation and documentation of suspected adverse drug reaction (ADR). I propose an algorithm for the evaluation of suspected ADR. I recommend that the adverse drug reaction scoring system(ASS) or the adverse drug reactions probability scale(APS) be used when evaluating suspected ADR. In these two scoring systems, points are allotted according to response to a series of questions on events relating to the clinical manifestations of the suspected ADR. Depending on the total points scored the probability of the suspected ADR are classified as definite, probable, possible and unlikely. When a patient's suspected ADR is classified as definite, then no further investigation is necessary. The patient should be considered sensitive to the drug. In a case where the suspected ADR is classified as probable or possible then further investigations should be considered to confirm the diagnosis. If the nature of ADR is life threatening only in-vitro test should be done. If the nature of ADR is not life threatening, in-vivo and oral provocative test dosing may be considered. It should be considered if the suspected drug in question cannot be substituted and when it is very frequently prescribed.

Algorithms↗
PubMed1988

An epidemiological comparison between hand eczema and non-hand eczema.

Thirty four per cent of 2110 patients with eczema attending a contact dermatitis clinic presented with hand eczema. An epidemiological comparison was made of patients with hand eczema and non-hand eczema (defined as eczema on parts of the body other than the hands). Occupational eczema was significantly more common in the hand eczema than the non-hand eczema group (P = 0.0011). The prevalence of atopy was the same in both groups (13%). The prevalence of irritant contact dermatitis was higher in the hand eczema group (32%) than the non-hand eczema group (13%) (P less than 0.0001). The rate of allergic contact dermatitis was lower in the hand eczema group (23%) than the non-hand eczema group (39%) (P less than 0.0001). The rate of positive patch test reactions was lower in the hand eczema group (41%) than the non-hand eczema group (56%) (P less than 0.0001). Nickel sulphate (8%), cobalt chloride (3%), potassium dichromate (3%), and fragrance mix (4%) were common allergens encountered in hand eczema group. None of these allergens was specifically more prevalent in the hand eczema than the non-hand eczema group. However, the prevalence of allergy to nickel, colophony, epoxy resin and medicaments was significantly higher in the non-hand eczema group.

Adolescent↗
PubMed1988

Epidemiology of contact allergy in Singapore.

The prevalence of contact allergy in 2471 patients patch tested in Singapore was 49.2% (571/1160) in women and 49.8% (653/1311) in men (sex difference not significant). The rate appeared to increase with age (43.7% in those less than 20 years, 50.6% between 20 and 49 years, and 63.1% in those greater than 49 years). There was no significant difference in the prevalence of contact allergy among the major races (Chinese, Malay, and Indian) of Singapore. Contact allergies in 16.8% (96/571) of women and 38.9% (254/653) of men (p less than 0.001) were occupational. Nickel, fragrance mix, proflavine, and chromate were common sensitizers. The male:female prevalence of nickel allergy was 1:2 (sex difference p less than 0.001) and for chromate was 7:1 (sex difference p less than 0.001). Chromate sensitivity was occupational in 87.7% (121/138) of men and 47.1% (8/17) of women (sex difference p less than 0.001). Proflavine, neomycin, and clioquinol were the more common medicament sensitizers.

Adolescent↗
PubMed1988

Occupational dermatosis among chrome platers.

14 (38%) of 37 chrome platers in 17 chrome electroplating factories surveyed had occupational contact dermatitis, chrome ulcers, or both. 7 had chrome ulcers, 6 had contact dermatitis and 1 had both. Another 16 (43%) workers had scars suggestive of previous chrome ulcers. Mucosal irritation was present in 57% of the workers. The most common was throat irritation (49%) followed by nasal irritation (41%). Mucosal irritation was more common in hard chrome platers, while skin ulcers and dermatitis were more common in bright chrome platers. Nasal septum perforation was seen in 1 worker. Skin ulceration appeared to be a more specific sign for occupational dermatosis in chrome platers than dermatitis when the prevalence rates were compared to controls. Of the 7 workers with chrome ulcers, only 1 was allergic to chromate. Of the 6 workers with dermatitis, 2 were allergic to chromate and 1 to nickel. The worker with ulceration and dermatitis was negative to chromate and nickel. Irritant factors are therefore important in the aetiology of contact dermatitis in these chrome platers.

Adolescent↗