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Biomedical subjects

G Serrano

Publications and source records attributed to G Serrano.

At least 19 recordsLinked to original sources
PubMed2000

Photosensitivity associated with treatment with triflusal.

BACKGROUND: Triflusal is a fluorinated aspirin derivative with antiplatelet properties, which is used in Spain for the management and prevention of thromboembolic disease. CASE REPORT: A 91-year-old female developed a systemic photosensitivity reaction 15 days after beginning triflusal preventive treatment (300 mg/12 h) for prior transient ischaemic attack. Photobiological study showed an abnormal response to light in areas exposed to ultraviolet B and A radiation, with a photopatch test positive to both triflusal and its main metabolite. These observations suggested a causal relation between triflusal and the clinical findings, as described in previous reports. CONCLUSIONS: The few cases reported to date and the clinicopathological features of this case suggested an immunological response as the most likely cause of the reaction.

Aged↗
PubMed1998

Flavan-3-ols isolated from some medicinal plants inhibiting COX-1 and COX-2 catalysed prostaglandin biosynthesis.

Extracts from the four plant species Atuna racemosa Raf. ssp. racemosa, Syzygium corynocarpum (A. Gray) C. Muell., Syzygium malaccense (L.) Merr. & Perry and Vantanea peruviana Macbr., traditionally used for inflammatory conditions, were fractionated using a cyclooxygenase-1 catalysed prostaglandin biosynthesis in vitro assay. The flavan-3-ol derivatives (+)-catechin, (+)-gallocatechin, 4'-O-Me-ent-gallocatechin, ouratea-catechin and ouratea-proanthocynidin A were isolated as active principles. The IC50 values ranged from 3.3 microM to 138 microM whilst indomethacin under the same test conditions had an IC50 value of 1.1 microM. The flavonol rhamnosides mearnsitrin, myricitrin and quercitrin were also isolated. When further tested for inhibitory effect on cyclooxygenase-2 catalysed prostaglandin biosynthesis, the five flavan-3-ol derivatives exhibited from equal to weaker inhibitory potencies, as compared to their cyclooxygenase-1 inhibitory effects. The flavonol rhamnosides were inactive towards both enzymes.

Animals↗
PubMed1997

Evaluation of some Samoan and Peruvian medicinal plants by prostaglandin biosynthesis and rat ear oedema assays.

In our ongoing program to find new anti-inflammatory compounds, 58 extracts from 46 different medicinal plant species, used in treatment of inflammatory disorders-38 plants from the traditional medicine of Western Samoa and eight originating from the indigenous medicine of the Shipibo-Conibo tribe of Peruvian Amazonia-ere evaluated. The ability of all extracts to inhibit cyclooxygenase-1 catalysed prostaglandin biosynthesis in vitro was examined. Of the plant species tested 14 showed moderate to strong inhibition; including 11 Samoan and three Peruvian species. Further, 12 Samoan and all eight Peruvian species were investigated on their inhibitory activity of ethyl phenylpropiolate induced rat ear oedema in vivo. Significant activity was shown by 10 of the Samoan and by all eight Peruvian species. An additional evaluation of the most active species was provided through a compilation of existing literature documenting traditional medicinal uses, pharmacological activity and chemical constituents. Several known cyclooxygenase-1 inhibitors were reported to which the observed pharmacological activity can be attributed at least partly. The combination of chemical and pharmacological literature data and our experimental data may help to explain the anti-inflammatory use of these species in indigenous medicine.

Animals↗
PubMed1996

[Relationship between psychosocial and cardiovascular variables in adolescents].

The present investigation analyzes the relationship between one of the principal behavioral factors associated with cardiovascular disease in the adult (the type A behavior pattern) and resting physiological measures (blood pressure and heart rate) in an adolescent sample. Two other psychosocial factors, anger and anxiety, were also analyzed. The study was carried out on 410 adolescents. The results showed that most adolescents who had high resting blood pressure were type-A personalities, showing scores significantly higher in the impatient and hostile components. Results also showed that these subjects scored quite high on anxiety and anger scales when compared to the control group.

Adolescent↗
PubMed1992

Oxicam-induced photosensitivity. Patch and photopatch testing studies with tenoxicam and piroxicam photoproducts in normal subjects and in piroxicam-droxicam photosensitive patients.

BACKGROUND: The mechanism of piroxicam-induced photosensitivity is unknown. It was first attributed to metabolites of the drug produced in vivo but further photochemical studies disclosed that piroxicam was not stable to light, forming at least two photoproducts. Photosensitivity reactions to droxicam and tenoxicam have been not reported. OBJECTIVE: The aim of this study was to determine whether piroxicam photoproducts contribute to the light reactions induced by this drug, to describe a case of droxicam-induced photosensitivity and to study the in vivo photosensitizing potential of tenoxicam. METHODS: Patch and photopatch tests with two major photoproducts of piroxicam, with different preparations of UVA-preirradiated piroxicam, and with low and high concentrations of tenoxicam were performed in normal volunteers and in piroxicam-photosensitive patients. Phototesting studies were also performed before and after the oral administration of tenoxicam in both groups of subjects. RESULTS: Positive patch test responses were obtained in piroxicam-photosensitive patients only with the preirradiated piroxicam preparations. Phototesting studies with tenoxicam were normal in both groups. CONCLUSION: Minor or intermediate piroxicam photoproducts are more likely to be responsible for the photosensitivity reactions induced by this drug.

Adult↗
PubMed1992

Photosensitivity induced by fibric acid derivatives and its relation to photocontact dermatitis to ketoprofen.

BACKGROUND: Photosensitivity reactions to fibric acid derivatives are not well understood and have been rarely reported. OBJECTIVE: The aim of this study was to describe two cases of photosensitivity, one induced by fenofibrate and one by bezafibrate; to study the in vivo photosensitizing potential of these drugs; and to evaluate the possibility of cross-reactivity between fenofibrate and ketoprofen. METHODS: Patch and photopatch tests with fibric acid derivatives and ketoprofen were performed in the patients, in 12 normal volunteers, and in 7 patients with photopatch-proven photocontact dermatitis to ketoprofen. Phototesting studies were performed both while the patients were taking the drugs and after withdrawal of them, as well as in a group of 18 hyperlipemic volunteers without history of photosensitivity who were taking therapeutic doses of fenofibrate or bezafibrate for 2 to 3 months. RESULTS: Positive photopatch test responses to ketoprofen and to fenofibrate were obtained only in the first patient, who also had a weaker positive ordinary patch test response to the latter. Five patients photosensitized to ketoprofen also had a positive patch test to fenofibrate. Phototesting studies were abnormal in both patients but normal in all volunteers. CONCLUSION: An association between systemic photosensitivity to fenofibrate and photocontact sensitivity to ketoprofen seems to exist. The structural similarities of these chemicals favor cross-reactivity.

Aged↗
PubMed1990

Piroxicam-induced photosensitivity and contact sensitivity to thiosalicylic acid.

A photocontact dermatitis developed in three patients after the application of gel containing 0.5% piroxicam. Patch tests were positive to thiomersal and thiosalicylic acid. Photopatch tests with piroxicam at several concentrations were positive in the three patients but negative in 62 normal volunteer subjects. Patch tests performed on 14 patients with proved systemic photosensitivity to piroxicam were positive for thiomersal and thiosalicylic acid. Nine of 12 patients previously sensitized to thiosalicylic acid and with no history of exposure to piroxicam showed positive photopatch test reactions to this chemical. These results support a relation between piroxicam-induced photosensitivity and contact sensitivity to thiosalicylic acid. Contact allergic sensitivity to the latter is a marker for patients with a high risk of developing photosensitivity reactions to piroxicam. These reactions may be due to photoproducts of the drug rather than metabolites.

Adult↗
PubMed1989

Riehl's melanosis: pigmented contact dermatitis caused by fragrances.

We report a case of a 27-year-old woman with a patchy, dark brown hyperpigmentation on the face. Patch tests were positive to lemon oil, geraniol, and hydroxycitronellal. A compact face powder that the patient used contained two of these chemicals. Hyperpigmentation disappeared within 6 months after the patient avoided contact with cosmetics containing these fragrances.

Adult↗
PubMed1989

Passive transfer of contact sensitivity to colophony as a complication of an allogenic bone-marrow transplant.

A 29-year-old woman developed allergic contact dermatitis from colophony 1 year after an allogenic bone-marrow transplant for refractory anaemia. The donor had a previous history of contact dermatitis from colophony, with a positive patch test. Although we cannot absolutely exclude active sensitization, it seems highly improbable because host immunity is severely restricted by the chemoradiotherapy used to prepare marrow graft recipients. The clinical data therefore suggest that sensitivity to colophony was passively acquired through marrow transplantation.

Adult↗
PubMed1988

Trends in mortality from cerebrovascular disease in France from 1968 to 1978. With reference to cardiovascular and all causes of death.

Cerebrovascular disease mortality in France during the period 1968-1978 was compared with cardiovascular and all other causes of death. Our study demonstrated a 25% decline in the age-adjusted cerebrovascular disease mortality rates in both sexes and particularly in the middle-aged groups. This decline is greater than that of the general causes of mortality, which was on the order of 20%. It parallels the decline in congestive heart failure mortality but differs from that of ischemic heart disease. Nevertheless, despite the increase in the proportion of elderly people in the population, the total number of deaths from cerebrovascular diseases has remained almost unchanged, although the deaths occur at a higher age than previously. If this trend is confirmed, cerebrovascular diseases will remain one of the more frequent causes of death in the elderly and thus a social problem of crucial importance.

Age Factors↗
PubMed1986

Photodistribution of varicella exanthem: report of two cases.

Two children were seen who had cutaneous lesions of varicella localized to sunburned and suntanned skin. Atypical features were observed in both cases. Based on certain hypotheses, we concluded that sun exposure may modify the clinical picture of varicella.

Chickenpox↗