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J C Trindade

Publications and source records attributed to J C Trindade.

25 records · Page 2Linked to original sources
PubMedDate not supplied

IgG subclasses serum concentrations in a population of children with Down syndrome: comparative study with siblings and general population.

Serum total IgG and subclasses were determined in three different groups of children: with Down syndrome, their siblings and general pediatric population. Several cases of IgG2 and IgG4 deficiency were identified, predominantly in children with Down syndrome. The differences, considering three age groups, were statistically significant for both groups in relation to the general population group, with an increase of IgG1 and IgG3 and a decrease in serum concentrations of IgG2 and IgG4. Down syndrome children and their siblings tend o have a similar variation of the IgG4 serum concentration levels (P < 0.05). The mechanisms of this concordance are not well understood. The results point out that an adequate strategy to improve the immune status of Down syndrome children could have a positive manifestation in the immune profile of their brothers.

Adolescent↗
PubMedDate not supplied

[A comparative study of ultrasonography, computed tomography and magnetic resonance imaging in the staging and invasiveness of adjacent structures by renal tumors].

BACKGROUND: Ultrasonography (US), Computed Tomography (CT), and Magnetic Resonance imaging (MR) were compared for the staging of renal tumors. The differences between these imaging techniques were also studied for their ability to detect adenopathies, vascular invasion, distant intra-abdominal metastases, and particularly adjacent organ invasion. METHODS: Thirty-one patients with solid or complex renal masses were prospectively studied using US, CT, and MR. Differences between the results obtained were studied using the COCHRAN G test and the McNEMAR test. The sensitivity and specificity of each diagnostic technique were compared against a "gold standard" of the surgical and histopathological findings. RESULTS: The following sensitivities were obtained: For the detection of adenopathy, US 63.6%, CT and MR 90.9%. For vascular invasion, US 42.8%, CT and MR 85.7%. For the adjacent organ invasion, US 28.5%, CT 85.7%, and MR 71.4%. Some of the criteria that suggest invasion of adjacent structures include: the envelopment of the adjacent structures by the tumor, tumor extension into the adjacent structures with an irregular appearance, and alterations in shape, size, and density of adjacent structures. Loss of fat planes between the tumor and adjacent structures is not a sign of tumor invasion. CONCLUSIONS: Significant differences were found in the detection capacity of US in relation to CT and MR, which were similar. All three techniques were highly sensitive and specific only in the detection of distant abdominal metastases. In addition to the accuracy of these diagnostic modalities for the detection and staging of tumors, invasiveness, risks and cost should be considered in relation to relative costs and benefits.

Adult↗
PubMedDate not supplied

[Immunoglobin subclasses and determination of specific antibodies. What role in the study of children with recurrent pneumonias?].

BACKGROUND: Recurrent pyogenic infections, including pneumonia, are known to occur in children with a defective immune system. Until recently, diagnosis was made by measuring major immunoglobulin isotypes and IgG subclasses. Recent reports show that in some cases all these measurements are normal, but that there is a defect in the production of specific protein or polysaccharide antibodies. OBJECTIVE: To study immune function in children with recurrent pneumonia to determine the most appropriate immunologic studies for the evaluation of recurrent infections in children. METHODS: Forty-three children (ages 2 to 12 years; mean 5.3 years, 29 male) who were referred to our pulmonology clinic because of recurrent lower respiratory tract infections. Major causes of recurrent infections were excluded by clinical, radiological or laboratory studies. Immunologic studies included serum immunoglobulins, IgG subclasses, IgA subclasses, isohemagglutinins and antibody responsiveness to vaccination with tetanus, rubella, H. influenza b conjugate and pneumococcal polysaccharide. RESULTS: The majority of children had normal or elevated serum immunoglobulin and subclass levels. Three patients had low levels of IgG2 and IgA, alone or simultaneously. Eleven patients failed to respond to Hib or rubella vaccination and one failed to respond to pneumococcal immunisation. CONCLUSIONS: Our preliminary results seem to indicate that a high proportion of children with recurrent pneumonia have a demonstrable immunologic abnormality. There is no direct relationship between low levels of IgG subclass and the child's capacity to form antibodies to several antigens. Defects in antibody production are very specific and an extended panel is necessary. Examination of the antibody-forming capacity seems important in the initial evaluation of children with recurrent pneumonia.

Antibodies, Bacterial↗
PubMedDate not supplied

Latero-terminal neurorrhaphy without removal of the epineural sheath. Experimental study in rats.

Termino-lateral neurorrhaphies have been used up to the beginning of this century. After this period, they have no longer been reported. We tested the efficacy of a new type of latero-terminal neurorrhaphy and evaluated the role of the epineural sheath. A group of 10 rats had the fibular nerve sectioned and the distal ending was sutured to the lateral face of the tibial nerve without removing the epineurium. All experiments were made on the right side, the left one remaining untouched in half of the animals of each group. The other half were denervated by sectioning and inverting the endings of the fibular nerves. In this way, tibial cranial muscles were either normal or denervated in the left side and reinnervated through latero-terminal neurorrhaphy in the right side. After 7.7 months, the animals were subjected to electrophysiological tests, sacrificed, and the nerves and muscles were taken for histological exams. A response of the tibial cranial muscle was obtained in 75% of the animals. The distal ending of the fibular nerve showed an average of 498 nerve fibers. The average areas of the reinnervated tibial cranial muscles were (mu 2):841.30 for M2n and 1798.33 for M2d. We concluded that the termino-lateral neurorrhaphy was functional, conducting electrical stimuli and allowing the passage of axons from the lateral surface of a healthy nerve, to reconstitute the distal segment of a sectioned nerve. The presence of the epineurium was no impediment to axonal regeneration or to the passage of electrical stimuli.(ABSTRACT TRUNCATED AT 250 WORDS)

Analysis of Variance↗
PubMedDate not supplied

Serial study of the complement fractions C3, C4 and C3PA in allergic children.

The C3, C4 and C3PA complement fractions were dosed by radial immunodiffusion in the serum of 25 children with ages from 4 to 9 years in a non symptomatic period comprehending 10 atopic asthmas (40,0% of the cases) 8 non atopic asthmas (32.0%) and 7 urticarias (28,0%). The quantitative dosage of the studied fractions was carried out in a serial form 7, 14, 30 and 45 days after the first determination, what made a total of 116 dosages of C3, 112 of C4 and 114 of C3PA. Globally, no differences were verified in the averages and standard deviations of the complement fractions studied in the various pathological situations considered. The complement anomaly more frequently observed was the C4 increase in 37,8% of the assays in patients with atopic asthma, 16,2% of the assays in patients with non-atopic asthma and in 33,3% of the assays in urticaria cases. The other complement fractions studied showed inconstant variations in some cases. The serial study demonstrated in the same patient, variations larger than 2 standard deviations in 25,8% of the assays for C3, 25,0% for C4 and 27,2% for C3PA, what may possibly indicate the great instability of the complement system which depends on a function, consumption or activation and synthesis relation, having to be taken into consideration in those assays comprehending the quantitative study of the seric complement fractions.

Asthma↗
PubMedDate not supplied

Specific immunotherapy 3 years follow-up in asthmatic children.

Seventy seven children, aged 4-10 years with bronchial asthma and sensibilization to D.pt were included in this study, divided in two groups: group A included 42 children submitted during 3 years to Sl; group B included 35 children followed during the same time period but not submitted to Sl. This group was regarded as the control group. The clinical evolution was evaluated every three months by clinical assessment, medication scores and DEMI. Total IgE, RAST, D.pt and IgG4 have been determined every year. The obtained results showed a clear improvement of the clinical score and reduction of medication use in the group submitted to Sl. In this group there was a total absence of medication during the last 6 months of Sl in 45.2% of the patients, while in the control group only 5.7% of the patients went completely without symptomatic and prophilactic therapy during the same time period. None of the children presented acute systemic reactions that could constitute a risk for their lives. 4 children presented systemic reactions, 3 of them with a bronchial asthma crisis, reversible with bronchodilating therapy and a child presented a rash reaction; two of them abandoned Sl. 13 children presented grade IV local reactions and one of them abandoned Sl; the others continued Sl with a reduction of the maintenance dose. Sl proved to be a safe and efficient ethiopathogenic therapy for child bronchial asthma treatment, when based on a clear selection of the cases and fulfillment of the safety rules established by the Allergology and Clinical Immunology European Academy.

Adolescent↗