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Biomedical subjects

R Guerra

Publications and source records attributed to R Guerra.

At least 109 records · Page 6Linked to original sources
PubMedDate not supplied

Tissue phantom for optical diagnostics based on a suspension of microspheres with a fractal size distribution.

We demonstrate experimentally the possibility of reproducing the phase function, absorption, and scattering coefficients of a real biological tissue (adult brain white matter and liver) using a suspension of polystyrene microspheres with a fractal size distribution. The design of a light scattering goniometer with a cylindrical cell in air is discussed, and phase function measurements using the device are described. The scattering coefficient is measured using transmission spectrophotometry and the absorption and reduced scattering coefficients are measured using a time-resolved method. A good match between real tissue and phantom parameters is demonstrated.

Animals↗
PubMedDate not supplied

Normal intraocular pressure in children.

The age-related trend values and the normal intraocular pressure (IOP) increase curve from birth through the 16th year of life were studied in 460 subjects with a noncontact tonometer (Keeler Pulsair, Keeler, Ltd, Windsor, Berks, UK). Much lower values than in adults were recorded in subjects up to the age of 3 or 4 years. This finding leads us to believe that in the treatment of infantile glaucoma IOP should be kept within the age physiologic levels, in an attempt to prevent visual field loss and optic atrophy.

Adolescent↗
PubMedDate not supplied

Congenital nasolacrimal duct obstruction: therapeutic management.

PURPOSE: Congenital nasolacrimal duct obstruction is a common condition, and its diagnosis must be based more on regular in-time epiphora than mattering. The purpose of this study is to better define the diagnostic criteria and therapeutic strategy. METHODS: We have retrospectively evaluated 1563 subjects treated from 1990-1997 at the Pediatric Ophthalmological Service of Modena University Eye Clinic. The mean age at first examination was 5.7 months. According to symptoms and age, patients were treated with antibiotic therapy, office probing, or general anesthesia probing. Recovery was confirmed only after a 3-month symptom-free period. RESULTS: More than 29% of patients recovered spontaneously or with topical antibiotic therapy. Office probing reduced the number of patients who needed a general anesthesia probing (from 62.97% from 1990-1993 to 33.61% from 1994-1997). In the period from 1994-1997, we changed the technique and especially the age of patients, obtaining a clearing of the obstruction in about 86% of cases compared with a 39% rate in the earlier period. Since 1994, in cases of general anesthesia probing, we have used a midazolam and ketamine anesthesiologic technique that has reduced risks and increased parental satisfaction and cost-effectiveness. Also, our data show that age at first attempt highly influenced probing failure rate. CONCLUSION: If the first ophthalmologic examination is precocious and correctly timed, the possibility of curing the patient using the simplest method is increased. Better results can be obtained with cooperation among pediatricians, ophthalmologists, and anesthesiologists.

Anesthesia, Local↗
PubMedDate not supplied

Experiences against HIV/AIDS/STDS of Somalis in exile in Gothenburg, Sweden.

Since 1989, the City of Göteborg Immigrant Services Administration has been making efforts to inform about HIV/AIDS. The purpose has been to ensure that even immigrant residents of the City of Göteborg (Gothenburg) have access to relevant information about HIV/AIDS. The administration's efforts have been a part of the collected efforts of Gothenburg to prevent the spreading of HIV. This paper attempts to discover and describe experiences against HIV/AIDS/STDs of Somalis in Exile in Gothenburg, Sweden. A qualitative sociological in-depth interviews with 13 individuals (6 women and 7 men) and with semi-structured and themetized emerging design was carried on. A follow up focus group interviews with 10 individuals (2 women and 8 men) was also performed. The paper reveals that the general understanding of subjects on the issues under discussion is almost the same though details may vary from one research participant to the other. They have described this through narratives. STDs and specially HIV/AIDS was perceived as something dishonourable by the subjects. The HIV/AIDS is perceived as a sin which Allah sends to punish those who have fornication or sex without marriage (Zinna). Of course, this tendency of shying off the problem leads to ignorance of how to behave, which in turn decreases the risk of perceptions and as a result may also increase the risk of being infected. As concerns protection as a preventive measure, attitudes vary. The traditionalists have argued that condom increased the possibility of promiscuity or fonication, while young and more modern people saw condom as something good. We may conclude that Somalis who have arrived in Western world and in Sweden as adults did never have a modern sexual education for themselves due to socio-cultural reasons and this has important implication for giving proper information to their children about sex organs, human sexual development and preventive measures against HIV/AIDS/STDs. These immigrant parents should be offered culturally sensitive communication and educational programmes aimed at raising their awareness about teenagers sexuality and the preventive measures against HIV/AIDS/STDs.

Acquired Immunodeficiency Syndrome↗