Insulin resistance among Brazilian schoolchildren: association with risk factors for cardiovascular diseases.

AIM: Our purpose was to evaluate Insulin Resistance (IR) and its association with risk factors for cardiovascular diseases (CVDs) among 161 (6- to 10-year-old) schoolchildren. METHODS: This two-stage cross-sectional study evaluated: BMI, blood pressure, personal history (birth weight) and family history of CVDs. Children with at least one of the following criteria participated in the second stage: obesity, personal or family history. Insulin resistance was determined using Homeostasis Model Assessment (HOMA). RESULTS: The HOMA distribution in terciles showed mean values for the first, second and third tercile of 0.41, 0.79 and 2.11 respectively. The HOMA distribution in the third tercile demonstrated statistically significant associations with overweight/obesity (p = 0.007), hypertension (p = 0.008) and low HDL (p = 0.02). Analysis of mean birth weight in each tercile and between terciles did not present any positive correlation (p = 0.213). CONCLUSION: Higher levels of HOMA (IR) were positively associated with risk factors for CVD among schoolchildren.

Mental health of the mothers of malnourished children.

BACKGROUND: The objective of this study is to measure the association between protein-energy malnutrition (PEM) in children and their mothers' mental health, in a low income area in the city of Embú, São Paulo, Brazil. METHODS: A case-control study was performed. Cases were 60 moderately and severely malnourished children (Gomez criteria) selected from two primary health care units. Controls consisted of 45 eutrophic children attending the same units. The main outcome measure was for the mothers to present a mental health score > 6 according with the 'Adult Psychiatric Morbidity Questionnaire' (QMPA), a psychiatric screening instrument. RESULTS: Of mothers of children with PEM, 63% and 38% of mothers in the control group were QMPA positive: odds ratio (OR) = 2.8 (95% confidence interval [CI]: 1.2-6.9). Of PEM children, 27% had low birthweight (LBW = < 2500 g) and 6% of the control group had LBW. Interactions were found between: mothers' mental health and number of children (with > or = 4 children: OR = 20.0 [95% CI: 2.1-274.2], with < or = 3 children: OR = 1.6 [95% CI: 0.6-4.5), as well as mothers' mental health and maternal age (in women > 30: OR = 12.5 [95% CI: 2.0-93.4], in women < or = 30: OR = 1.5 [95% CI: 0.5-4.4]. CONCLUSIONS: Mothers of children with PEM showed a higher rate of mental disturbances than mothers of eutrophic children. Unlike LBW, maternal age and number of children interact with mothers' mental health, increasing the association. Management of poor mental health may lead to mothers being better caretakers of their children and this may have a positive impact on PEM.

Apheresis in primary focal segmental glomerulosclerosis of native and transplanted kidneys: a therapeutic protocol.

BACKGROUND: Patients with focal segmental glomerulosclerosis (FSGS) develop nephrotic syndrome and terminal renal failure in most cases. FSGS reappears in 15-50% of transplanted kidneys and frequently causes the graft loss. Sera from patients with FSGS of native or transplanted kidneys contain some proteinuric or permeability factors (PF) which can be removed by means of plasma exchange (PE) or protein A Immunoadsorption (IA). METHODS: We suggest a therapeutic protocol, for patients with biopsy proven FSGS of native or transplanted kidneys, resistant to steroid and immunosuppressive therapy, based on the association of PE or IA to conventional drug therapy. Daily proteinuria, renal function, serum albumin and circulating level of proteinuric factors (permeability test) will be monitored at regular time intervals during the apheresis cycle, which will be intensive at the beginning (8-10 sessions in 4 weeks) and very gradually discontinued. Results. We will consider satisfactory remission the reduction of proteinuria below 1 g/day, improvement of renal function, normalization of serum albumin level (> 3.5 g/dl). Partial remission will be considered: proteinuria below 3 g/day, stable renal function, serum albumin level between 3 and 3.5 g/dl. Permeability test, if positive at baseline examination, should be negative after apheresis. CONCLUSIONS: The primary endpoint of our protocol is: lasting remission (satisfactory or partial) after the apheresis suspension. Secondary endpoints are: maintained remission with continuing apheresis sessions, correlation between permeability activity and disease activity, identification of responders and non responders patients on the basis of positive permeability test.

Percutaneous nephrolithotomy of transplanted kidney.

Urinary lithiasis after renal transplantation is a relatively uncommon disease; the predisposing factors and the composition of calculi are identical to those of patients with native kidneys. We present a case of a 45-year-old woman with a staghorn stone in a left-sided transplanted kidney who was treated successfully by percutaneous nephrolithotomy (PCNL). After reviewing the literature, we conclude that PCNL in transplanted kidney is a feasible and safe procedure. The technical aspects of the procedure, such as patient position and the use of the ultrasound-guided caliceal puncture, are stressed.

[Social inequalities and health services use: evidences from a stratified household survey]. / Desigualdades sociais e uso de serviços de saúde: evidências de análise estratificada.

OBJECTIVE: The study aims to identify children who are not benefited by local health programs, looking for to characterize the excluded segment of the population in order to broaden the access to and use of the main actions provided by local health programs. METHODS: A sample of 465 children aged less than 1 year was studied, living in the year of 1996 in Embu, a city of the metropolitan area of S. Paulo, Brazil. Our hypothesis was that there is a higher availability of private health care resources among families who haven't been using the local health program. The statistical analysis consisted of stratified association analysis to study the heterogeneity between and intra four strata of families defined by different socioeconomic conditions. RESULTS: Although only 85.4% of the study children were enrolled in local health services, 91.2% of them were being benefited by main health care actions. The analysis of differences intra strata revealed that our hypothesis was only corroborated in one stratum. It is in the stratum 3, which concentrates the peripheral population, where we could find children who have not been using the local health program in Embu city. CONCLUSIONS: In the same social segment it was detected some inner heterogeneity among families related to the availability of private resources for their children health care.

Assessing morbidity in the paediatric community.

INTRODUCTION: Morbidity information is easily available from medical records but its scope is limited to the population attended by the health services. Information on the prevalence of diseases requires community surveys, which are not always feasible. These two sources of information represent two alternative assessments of disease occurrence, namely demand morbidity and perceived morbidity. The present study was conceived so as to elicit a potential relationship between them so that the former could be used in the absence of the latter. METHODS: A community of 13,365 families on the outskirts of S. Paulo, Brazil, was studied during the period from 15/Nov/1994 to 15/Jan/1995. Data regarding children less than 5 years old were collected from a household survey and from the 2 basic health units in the area. Prevalence of diseases was ascertained from perceived morbidity and compared to estimates computed from demand morbidity. RESULTS: Data analysis distinguished 2 age groups, infants less than 1 year old and children 1 to less than 5. The most important groups of diseases were respiratory diseases, diarrhoea, skin problems and infectious & parasitical diseases. Basic health units presented a better coverage for infants. Though disease frequencies were not different within or outside these units, a better coverage was found for diarrhoea and infectious & parasitical diseases in the infant group, and for diarrhoea in the older age group. Equivalence between the two types of morbidity was found to be limited to the infant group and concerned only the best covered diseases. The odds of a disease being seen at the health service should be of at least 4:10 to ensure this equivalence. CONCLUSION: It was concluded that, provided that health service coverage is good, demand morbidity can be taken as a reliable estimate of community morbidity.

[Evaluation of the Malnourished Children's Recuperation Program in the town of Embu, located in the Metropolitan Area of São Paulo]. / Avaliação do Programa de Recuperação de Desnutridos do Município do Embu, na Região Metropolitana de São Paulo.

The objective of this study is to assess the anthropometric evolution of children who had been assisted by the Malnourished Children's Recuperation Program in the town of Embu, as well as to analyze some variables that interfered in this evaluation. The study included 233 children aged under five, enrolled in the program from January 1984 to December 1985. 201 (86,3%) were undernourished grade II and 32 (13,7%) grade III, according to Gomez. The percentage increase of Weight in relation to Age (W/A) and Height in relation to Age (H/A) - outcome variables, in the first and last examinations in the program - were analyzed, using the multiple linear regression. Younger children and in worse nutritional conditions showed higher W/A and H/A increases. Low birth weight, more frequent examinations, and longer stay in the program were associated to lower W/A increases. The presence of chronical pathologies jeopardized the H/A rate increases. This result strengthens the importance of developing programs for the assistance of undernourished children, due to higher risk of morbi-mortality in this group, mainly in younger children and with worse nutritional conditions.

[Morbidity and malnutrition risk factors in children followed up by a child health care program]. / Fatores de risco para morbidade e desnutrição em crianças acompanhadas em programa de atenção à saúde da criança.

OBJECTIVE: The objective of this study was to identify risk factors associated with malnutrition and morbidity in the population of children accompanied by the Child Health Care Program in Embu, São Paulo (Brazil), with the aim of giving a better direction to health activities. METHODS: The case-study was constituted by a cross-section of 1,024 children, corresponding to 25.0% (probabilistic sistematic sample) of the total of children under 12 months registered in six primary health care centers in the Municipality, during the period from July 1988 to July 1989. The risk factors were analyzed according to the presence or absence of hospitalization and weight evolution - favorable or unfavorable - until two years of age. For the statistical analysis the multivaried approach was used, through the tecnique of logistic regression. RESULTS: Of a total of 1,024 children, 428 (39.1%) were classified as high risk, 658 (60.1%) as low risk and 8 (0.8%) presented pathologies at their first appointment, being excluded from the analysis. Prematurity (adjusted RR = 3.35), serious illness in the newborn (adjusted RR = 4.12) and the death of a younger brother or sister of less than five years (adjusted RR = 2.70) constituted risk factors for hospitalization in the first two years of life. Weight at birth between 2,500 and 2,750 g (adjusted RR = 2.46), brother or sister with malnutrition (adjusted RR = 4.17) and maternal age of 18 years old or less (adjusted RR = 1.87) constituted risk factors for unfavourable weight evolution. CONCLUSIONS: These results, as well as the process of carrying out this study, supported the reformulation of the Child Health Care Program in Embu, permitting differentiated action for the highest risk group, thus garanteeing the essential for all.

[Autoimmune and lymphoproliferative HCV-correlated manifestations: example of mixed cryoglobulinaemia (review)]. / Manifestazioni autoimmuni e linfoproliferaive HCV-correlate: l'esempio della crioglobulinemia mista.

Mixed cryoglobulinaemia (MC) is a systemic vasculitis involving small vessels (arterioles, capillaries, venules). The histological hallmark of the disease is the leukocytoclastic vasculitis secondary to the vascular deposition of circulating immune-complexes (CIC), mainly cryoglobulins and complement. The immune-mediated vasculitic lesions are responsible for different MC clinical features, including cutaneous and visceral organ involvement. Hepatitis C virus (HCV) represents the triggering factor in the large majority of MC patients (>90%). Moreover, several epidemiological, clinico-pathological and laboratory investigations suggested a possible role for HCV in a wide spectrum of immuno-lymphoproliferative disorders; namely, porphyria cutanea tarda, diabetes, polyarthritis, lung fibrosis, poly-dermatomyositis, thyroiditis, thyroid cancer, B-cell non-Hodgkin's lymphomas (B-NHL), etc. Renal involvement with or without MC syndrome can be observed in HCV-infected individuals. There is great geographical etherogeneity in the prevalence of HCV-related disorders. This epidemiological observation suggests a multifactorial and multistep process in the pathogenesis of these conditions, involving other unknown genetic and/or environmental factors. HCV lymphotropism may explain the mono-oligoclonal B-lymphocyte expansion observed in HCV-infected individuals, particularly in MC patients. The 'benign' lymphoproliferative disorder, classified as monotypic lymphoproliferative disorders of undetermined significance (MLDUS), may be responsible for the wide production of CIC, including cryoglobulins, rheumatoid factor and different organ and non-organ specific autoantibodies. The consequence is the appearance of various HCV-related autoimmune diseases, including MC syndrome. This latter may be complicated by B-NHL in 10% of the cases; moreover, HCV infection has been confirmed in a significant percentage of 'idiopathic B-NHL. For a correct therapeutic approach to cryoglobulinaemic vasculitis, as well as to other HCV-related disorders, we should deal with concomitant, conflicting conditions: HCV infection, autoimmune and lymphoproliferative alterations. In this scenario, we can treat the diseases at three different levels by means of etiologic, pathogenetic and/or symptomatic therapies. The eradication of HCV by combined interferon and ribavirin therapy can be achieved in only a minority of cases. On the contrary, severe complications such as glomerulonephritis, sensory-motor neuropathy or diffuse vasculitis can be effectively treated by a combination of corticosteroids, plasma exchange and cyclophosphamide. More recently, a pathogenetic treatment with rituximab, a monoclonal chimeric antibody that binds to the B-cell surface antigen CD20 with selective B-cell blockade, was proposed in patients with HCV-related MC syndrome.

Day care centres as an institution for health promotion among needy children: an analytical study in São Paulo, Brazil.

OBJECTIVE: To evaluate the role of day care centres in the nutritional state of children belonging to a low-income population, comparing the nutritional state of the children in the day care centres with children in the same population who were given other types of day care. DESIGN: Analytical cross-sectional study. SETTING: Public day care centres/primary health care. PARTICIPANTS: Children aged 0-6 yr attending in 4 public day care centres (n=446) and sample of population obtained during vaccination campaign (n=1626). MEASUREMENT: Nutritional evaluation was conducted through weight and height measurements, using as a standard the NCHS (USA) table and Gomez and Waterlow methodology. The type of daily care received by the children was assessed through a questionnaire answered by the responsible persons during the vaccination campaign. RESULTS: The nutritional status of children attended in the day care centers was better than children of the same community receiving other types of daily care (OR=0.48; CI 95%=0.36-0.65;P>0.0001). The improvement was related to more than 1 year of enrollment in the day care (OR=0.74; CI 95%=0.57-0.96;P=0.02).

Urinary excretion of proteins and tubular enzymes in renal transplant patients.

The aim of this study was to evaluate, in renal transplant recipients with different function of the graft, the urinary excretion of some low molecular weight proteins and tubular enzymes frequently employed as indicators of tubular dysfunction. Urinary excretion of proteins and enzymes was measured in 51 renal transplant patients and, for comparison, in 73 patients affected by different kidney diseases with various degrees of renal function. Values of urinary beta 2-microglobulin and retinol-binding protein higher than normal were found in most transplanted patients, even in those with good renal function. On the other hand, in renal patients the urinary excretion of low molecular weight proteins was high only when creatinine clearance was lower than 30 mL/min/1.73 m2. Furthermore, an increased urinary excretion of tubular enzymes was found in a higher number of transplanted patients than of renal patients. This behavior was particularly evident for lysosomal enzyme N-acetyl-beta-D-glucosaminidase. In conclusion, a tubular dysfunction occurs in the transplanted kidneys, even in those with well preserved glomerular function.

Therapy with pulse methylprednisolone and short course pulse cyclophosphamide for diffuse proliferative glomerulonephritis.

The incidence of renal flares and the long-term outcome in a group of 33 systemic lupus erythematosus (SLE) patients with diffuse proliferative glomerulonephritis (DPGN) treated with pulse steroids and a short course of pulse cyclophosphamide (CYC) are evaluated. Fifteen patients (45%) experienced a flare of renal disease at some time after the discontinuation of the immunosuppressive (IS) therapy; among these half (24%) were 'early' flares occurring shortly after the discontinuation of therapy, and the other half (21%) were 'late' flares occurring more than 2 y after the discontinuation of the treatment. Nine patients (27%) showed a poor renal outcome at the end of follow-up. On multiple regression analysis, a younger age and a high activity index (AI) on renal histology were found to be correlated with the occurrence of renal flares. Our results suggest that the combination of pulse steroids with a short course of pulse CYC (six to nine pulses) is effective in both controlling disease activity and in preventing the occurrence of renal flares in DPGN. However, short term IS therapy might not be sufficient to maintain disease control in younger patients with active lesions on renal histology. Such patients might be candidates to receive more prolonged IS treatment.

Low-antigen-content diet in the treatment of patients with IgA nephropathy.

Since dietary macromolecular antigens can be involved in the pathogenesis of IgA nephropathy (IgAN), the effect of a low-antigen-content diet was evaluated in 21 patients (10 women, 11 men, mean age 27.7 +/- 10 years) with immunohistochemical findings of active IgAN. The diet was followed for a 14-24-week period (mean 18.8 +/- 6); in all cases the effects of the treatment were evaluated by clinical and serological parameters, and in 11 patients also by repeat renal biopsy. After dietetic therapy a significant reduction of urinary proteins was recorded (P < 0.001); in particular, heavy proteinuria (> 1 g/day), present in 12 cases during the 6 months preceding the treatment, was markedly reduced or disappeared in 11. At post-treatment control biopsy mesangial and parietal deposits of immunoglobulins, complement C5 fraction and fibrinogen were significantly reduced. The improvement of the objective parameters such as heavy proteinuria, a strong predictor of a poor prognosis, and of immunohistochemical alterations indicate that a low-antigen diet can positively affect patients with IgAN. These results could be ascribed to a reduction of nephritogenic food antigen input and to a putative functional restoration of the mononuclear phagocytic system.

Acute effect of plasma exchange on arterial blood pressure and plasma renin activity.

Blood pressure (BP) decreases significantly in patients with immune complex nephritis and hypertension in the course of therapeutic plasma exchange (TPE). To investigate possible underlying mechanisms of this effect, the variations of supine and upright BP and plasma renin activity (PRA) acutely induced by PE (performed by isovolumetric replacement of plasma with 4% albumin in saline solution) were analyzed in six patients. On the average, both supine and upright BP decreased after TPE; however, statistical significance was obtained only for upright systolic BP. Supine and upright PRA did not change significantly, although a clearly blunted response to posture was observed in three patients. The changes of BP induced by TPE were apparently not due to a functional depression of the renin-angiotensin system, since the more marked decrements in BP were observed in the patients with lower basal PRA.

Proteinuria in focal segmental glomerulosclerosis: role of circulating factors and therapeutic approach.

The clinical course of primary Focal Segmental Glomerulosclerosis (FSGS) is frequently complicated by nephrotic range proteinuria and progression to renal failure. The high recurrence rate of the disease in transplanted kidney suggests the hypothesis that such patients have a circulating factor that alters glomerular capillary permeability. In recent years some authors found that serum from patients with FSGS increases glomerular permeability to albumin and partially identified the permeability factor (PF) as a protein of 30-50 Kd m.w. The removal of this protein by means of Plasma Exchange (PE) or plasma Immunoadsorption by Protein A (IA) decreased proteinuria. In this report we provide preliminary data about the prevalence of PF and the therapeutic effect of its removal by IA, in 3 pts with recurrence in the transplanted kidney, and 4 with FSGS of the native kidneys. They were resistant to corticosteroids (CS) and immunosuppressive (IS) therapy. 10 IA sessions were performed in 4 weeks: if a remission was achieved IA was gradually tapered. The level of PF in the serum was measured by an in vitro assay to determine the glomerular permeability to albumin. The FSGS was histologically proven in all cases and the degree of evolution was evaluated. PF levels, serum creatinine, daily proteinuria and serum albumin were monitored. The 3 patients with recurrent FSGS had a normalization of the PF levels; 2 had a clinical remission. In FSGS of native kidneys PF was elevated in 3/4 cases; 1 had a clinical remission; 2 with extensive sclerohyalinosis and 1 without PF levels did not improve. Our results confirm that most patients with FSGS have high PF serum levels and suggest that its removal can be beneficial.

Hypotensive effect of plasma exchange in immune complex nephritis.

The effect of plasma exchange (PE) on blood pressure (BP) in 20 hypertensive patients (9 with mixed cryoglobulinemia, 7 with systemic lupus erythematosus, and 4 with idiopathic glomerulonephritis) was evaluated retrospectively. In each PE 1.5-2.5 L of plasma was replaced with an equal volume of 4% albumin polysaline solution. The frequency of PE was three times per week for the first 2 weeks and twice per week subsequently. Sixteen patients were on hypotensive treatment at the onset of PE. Their systolic/diastolic BP was 171 +/- 4.7/102 +/- 3.0 mm Hg (mean +/- 1 SEM). After 4 weeks, BP decreased to 141 +/- 2.8/89 +/- 2.3 mm Hg (p less than 0.001), although in 10 patients antihypertensive drug therapy had been reduced or discontinued. The most marked decrease of BP occurred after the first week (152 +/- 5.3/92 +/- 2.9 mm Hg), and this decrement correlated remarkably well with pressure levels before PE despite the great heterogeneity of the individual patients (for diastolic BP, r = 0.87, p less than 0.001; for systolic BP, r = 0.60, p less than 0.01). A mild decrease of serum creatinine was observed during PE, but its time course was different from that of BP, and did not correlate with this parameter.

Associated or combined vaccination of Brazilian infants with a conjugate Haemophilus influenzae type b (Hib) vaccine, a diphtheria-tetanus-whole-cell pertussis vaccine and IPV or OPV elicits protective levels of antibodies against Hib.

This study investigated the immunogenicity and safety of including a Haemophilus influenzae type b vaccine (polyribosylribitol phosphate conjugated to tetanus toxoid, PRP-T) in three different vaccination schemes: (1) PRP-T reconstituted with a combined diphtheria-tetanus-pertussis-inactivated poliovirus vaccine (DTP-IPV//PRP-T); (2) PRP-T reconstituted with DTP and administered concomitantly with an oral poliovirus vaccine (DTP//PRP-T+OPV); and (3) PRP-T administered concomitantly with DTP at a different injection site and OPV (DTP+PRP-T+OPV). Vaccines were given at 2, 4, and 6 months of age. A total of 252 infants were enrolled, and randomly assigned to one of the three vaccination groups (84 infants in each group); 241 infants were followed until the end of the study. Antibody production against PRP, diphtheria, tetanus and pertussis antigens was satisfactory for each vaccination scheme used. A good response to Hib vaccine was elicited in each group, and 3 months after the third vaccine dose, at least 97% of children in each group had levels of PRP antibody considered to be seroprotective (>0.15 microg/ml), and over 90% of children in each group had levels over 1. 0 microg/ml. The solicited local and systemic adverse events following vaccination were mild in all groups and resolved within 4 days without medical intervention. With the exception of fever, which was more common after the second dose in children who received DTP-IPV//PRP-T, local and systemic reactions did not differ between the vaccination groups. Due to the practical advantages of combined vaccines, their use in routine immunization programs in developing countries is highly desirable. Our results show that Hib conjugate vaccine can be included in routine immunization programs that include either OPV or IPV with satisfactory immunogenicity and safety profiles. This flexible approach should facilitate the inclusion of the Hib conjugate vaccine in routine immunization programs on a world-wide scale.