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Biomedical subjects

P Páramo

Publications and source records attributed to P Páramo.

7 recordsLinked to original sources
PubMed1993

[Extracorporeal lithofragmentation and of direct contact. Development of mathematical models for calculating the energy and predicting the fragmentation].

The present experimental 'in vitro' study pursues the development of mathematical equations which, prior to lithofragmentation, would allow to estimate the amount of energy required and to predict the degree of fragmentation for each of the different sources of energy. A total of 114 calculi with 6 different compositions were analyzed by conventional X-rays (Rx), computerized axial tomography (CT) and dual X-ray densitometry (DO). Calculi were then fragmented using 4 different types of energy: electrohydraulic (LEH), piezoelectric (LEP), ultrasounds (US) and pulse laser (LAS). The correlation between imaging techniques parameters on the one side, and the amount of energy used and degree of fragmentation obtained on the other one, allow with a multiple linear regression analysis, both to develop mathematical equations to estimate the amount of energy required, and to predict the fragmentation rate.

Biophysical Phenomena↗
PubMed1991

Genuine hereditary hydronephrosis in a three-generation family. Clinicopathological and genetic implications with a review of the literature.

The clinical features and management of genuine hereditary hydronephrosis (GHH) in 4 members of the same family are presented. Genealogical studies provide evidence of a dominant autosomal inheritance with complete penetrance. All affected members of the family had inherited the same HLA haplotype through the male line. This finding, added to those from previous association studies with histocompatibility typing (in 3 families), lends support to the localization of the GHH gene/s in the 6p human chromosome. Based on our findings from the present familial study and on a review of the literature, we suggest that all first-degree relatives of children or adults with genuine hydronephrosis should be screened by ultrasound. Such a prospective screening, including fetal echography, will lead to earlier diagnosis and treatment of asymptomatic cases and, moreover, will identify GHH cases for possible genetic counseling with regard to the empiric recurrence risk.

Adult↗
PubMed1990

[Xanthogranulomatous pyelonephritis. Retrospective study].

The incidence of PGX in our setting is low (0.67%). Middle-aged women comprise most of our cases. This disease process is usually unilateral; 53.2% of the present series had right-sided renal involvement. Over the past 17 years, 135 cases of histopathologically-documented XGP have been recorded at our hospital. Sixty-three cases were studied retrospectively. Patient history, symptoms and signs, and data gleaned from physical examination are presented. Similarly, patient outstanding pathogenetic features are described. Preoperative diagnosis of XGP is difficult. The availability of high resolution imaging techniques has enhanced diagnostic accuracy. Urinary cytology permits preoperative diagnosis with an accuracy rate of 80%. The postoperative prognosis is excellent.

Aged↗