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Biomedical subjects

M Ruiz

Publications and source records attributed to M Ruiz.

287 records · Page 16Linked to original sources
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[Infectious hepatitis. I. Presence of HBs antigen].

A prospective study in 268 patients of different pediatric ages affected with icteric hepatitis is presented, with a longitudinal follow-up of one year minimum. Different types of clinical evolution are described and related to the presence of HBs antigen. In 34 of the 268 patients HBs antigen was positive; in 20 of 28 patients with acute and long evolution, positivity of the antigen was transitory with an average of 46 days; in the remaining 8 of 28 patients it extended from 6 months to less than 2 years. The presence of HBs antigen is a risk that may be correlated with the tendency to extend the prolonged.

Child↗
PubMedDate not supplied

In vitro demineralization inhibition of enamel caries utilizing an unfilled resin.

Smooth surface caries remain a concern in children, particularly those that are diagnosed with "baby bottle caries." The purpose of this study was to evaluate the caries inhibition of an unfilled resin placed on smooth enamel surfaces. Incisors were obtained and painted with an acid-protective varnish, excluding 2 mm x 6 mm windows on the labial surface. Each tooth had an unfilled resin placed over half the area of the window; the remaining area was not treated. One hundred microns longitudinal sections were obtained from the treated and non-treated sites. Polarized photomicrographs were taken of each section, in imbibition media of air, water and Thoulet's (R.I.: 1.41, 1.47), representing a minimum of 1%, 5%, 10%, and 25% pore volume respectively. The sections were then painted with an acid-protective varnish so that only the external surface was exposed and placed in separate closed environments of a non-fluoridated artificial saliva. One section from each tooth had unfilled resin on the external surface, one section had only natural enamel exposed, and a third section had the external surface varnished to act as a control. The teeth were thermocycled at 10 degrees C and 50 degrees C, 20 cycles per day for three months; they were also cycled through artificial caries challenge (pH 4.4) for 35 minutes, three times per day. Sections were then photographed under polarized light, as before, and areas of lesions were digitized. Results demonstrated caries to be present on all non-treated enamel surfaces exposed to the artificial caries challenge. Significantly less enamel demineralization occurred when an unfilled resin was placed on it (p < 0.001).

Composite Resins↗
PubMedDate not supplied

[Development of a questionnaire for the assessment and quantification of overweight and obesity related lifestyles].

INTRODUCTION: Lifestyle intervention is mandatory for obesity treatment. The aim of this study is to design a questionnaire to describe and quantify those behaviours more closely related to obesity in the Spanish obese population. METHODS AND PROCEDURES: An expert panel designed a preliminary 57 Liker-type item questionnaire, which was self-administered to 335 overweight patients (110 male, 225 female; age, 42 +/- 14 years; BMI, 32.6 +/- 3.7 kg/m2). After a subjacent dimensionality searching and item reducing first phase, a shrunk questionnaire of 24 items was then self-administered to 156 overweight patients (52 male, 104 female; age 42 +/- 12 years; BMI, 33.1 +/- 3.5 kg/m2); 56 of those patients were re-administered the questionnaire in order to provide test-retest information. RESULTS: Final questionnaire includes 22 items clustered in five dimensions: diet caloric intake, searching for psychological well-being eating, physical activity, healthy eating and alcohol intake. Proposed factorial structure is mostly reproduced in different samples and using different extraction methods: all dimensions but alcohol intake score alpha values > 0.75 for liability; test-retest stability is greater than 0.90 in all dimensions but alcohol intake; results for all validity tests performed (of construct, of content and discriminative) are highly satisfactory. CONCLUSION: Metrics study results (liability and validity) demonstrate that the proposed questionnaire provides an excellent tool to assess those lifestyles related to obesity control.

Adult↗
PubMedDate not supplied

[Cordopexy. Surgical technic and results. 4 years' experience].

We show our experience during four years, with a new technique used in the management of bilateral vocal cord paralysis. We expose clearly the surgical technique, and the obtained results. We have done 15 cordopexy techniques to 10 patients with bilateral vocal cord paralysis, from different etiology, being the thyroid gland surgery, the most frequent.

Adult↗
PubMedDate not supplied

[Infectious bovine rhinotracheitis (VHB-1). II. Physico-chemical properties of strain L-114].

The thermal stability, density gradient and morphological features of a recently isolated L-114 strain of infectious bovine rhinotracheitis virus were determined. Morphology studies showed an enveloped virus with 200 nm of total diameter, a core diameter of 90 nm and an icosaedral-type structure; purified preparations contained both complete and empty viral particles. More than 90% of the infectivity was lost after 15 hours at 37 degrees C; at 56 degrees C, inactivation was much faster, with a 3 log titer reduction, in 24 minutes. Density gradient studies in cesium chloride, carried out with virus concentrated on sucrose gradient, gave an estimated density of 1.25 g/ml for the purified virus, which fits with light herpesviruses.

Centrifugation, Density Gradient↗
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[Thrombophlebitis of the cavernous sinus secondary to polysinusitis. Report of a new case].

Cavernous sinus thrombophlebitis syndrome is uncommon nowadays. Despite the wide range of antimicrobial agents it carries a high mortality. The disease frequently arises from infection of face, mouth, nose and paranasal sinuses, reaching the cavernous sinus by venous spread. Involvement of adjacent anatomic structures accounts for most of the clinical findings. Meningeal involvement, bilateral orbital edema and ocular cranial nerves palsy are very helpful in the differential diagnosis. Streptococcus spp., Staphylococcus spp., Haemophilus influenzae and anaerobic organisms are considered to be the most frequent etiological agents. In the present paper we report a case of cavernous sinus thrombophlebitis following left side polysinusitis. The patient presented with the main clinical features of the syndrome along with Streptococcus equisimilis and Fusobacterium necrophorum bacteremia. Urgent surgery of infected sinuses and appropriate antibiotic therapy led to a favorable outcome. The patient made and excellent progress and was discharged completely recovered two weeks after admission.

Adult↗
PubMedDate not supplied

A case of allergy to human insulin associated with high IgG/IgE ratio for specific antibodies.

A 37-year-old woman with a previous history of allergic rhinitis and bronchial asthma presented local and generalized allergic reactions to bovine, porcine and human insulins. She developed ketoacidosis, high insulin requirements and transient hypoglycemic episodes. Several desensitizing schedules were applied in order to induce tolerance to human insulin therapy. In addition, the following parameters of the humoral immune response were measured in different serum samples taken within 13 days after one of the anaphylactic episodes: insulin antibodies (binding range = 29.4-47.8%; cutoff = 2.6%), total IgE (range = 500-850 IU/ml; normal values = 3.7-269 IU/ml), specific IgE (range = 0.42-0.83 PRU/ml; class 2) and subclasses of specific IgG (IgG1 = 97.2 SDS; IgG2 = 41.1 SDS; IgG3 = 9.9 SDS; IgG4 = 0.3 SDS, on day 1). A binding capacity of 31.8 IU insulin/l obtained by Scatchard analysis was in agreement with episodes of elevated insulin requirements and hypoglycemia. A high anti-insulin IgG/IgE ratio, along with high levels of specific IgG1 antibodies, suggested that the latter antibodies could be involved in the development of anaphylactic episodes.

Adult↗
PubMedDate not supplied

[Natural history of viral hepatitis A in Chilean adults: clinical and laboratory aspects].

In many countries, Hepatitis is mainly due to virus. A. When improving life condition in a given population, initially there is a tendency to increase the number of cases in adults. We report clinical and laboratory findings in 87 adults with acute viral Hepatitis A in Chile. The rate man/woman was 1.55/1. Mean age: 23.8 years. Clinical forms: icteric classical (77.01%), cholestatic (10.34%), anicteric (8.05%), biphasic (2.30%) and fulminant (2.30%). From 87 patients in consult 1, 64 were controlled at day 15 (consult 2) and 35 one year later (consult 3). Laboratory (means): ALT (UI/L): 856.8, 111.6 and 20.8 in consult 1, 2 and 3 respectively. Correlation between values of ALT and AST (p < 0.0001). Mean total bilirubin (mg%): 6.6, 2.5 and 0.8 respectively. The evolution of Hepatitis A was favorable with a rapid decrease of clinical signs and normalization of laboratory values within the 3 first weeks of disease.

Adolescent↗