OBJECTIVE: Prader-Willi Syndrome is a common etiology of syndromic obesity that is typically caused by either a paternal microdeletion of a region in chromosome 15 (microdeletions) or a maternal uniparental disomy of this chromosome. The purpose of this study was to describe the most significant clinical features of 35 Brazilian patients with molecularly confirmed Prader-Willi syndrome and to determine the effects of growth hormone treatment on clinical outcomes. METHODS: A retrospective study was performed based on the medical records of a cohort of 35 patients diagnosed with Prader-Willi syndrome. The main clinical characteristics were compared between the group of patients presenting with microdeletions and the group presenting with maternal uniparental disomy of chromosome 15. Curves for height/length, weight and body mass index were constructed and compared between Prader-Willi syndrome patients treated with and without growth hormone to determine how growth hormone treatment affected body composition. The curves for these patient groups were also compared with curves for the normal population. RESULTS: No significant differences were identified between patients with microdeletions and patients with maternal uniparental disomy for any of the clinical parameters measured. Growth hormone treatment considerably improved the control of weight gain and body mass index for female patients but had no effect on either parameter in male patients. Growth hormone treatment did not affect height/length in either gender. CONCLUSION: The prevalence rates of several clinical features in this study are in agreement with the rates reported in the literature. Additionally, we found modest benefits of growth hormone treatment but failed to demonstrate differences between patients with microdeletions and those with maternal uniparental disomy. The control of weight gain in patients with Prader-Willi syndrome is complex and does not depend exclusively on growth hormone treatment.

A síndrome de Schinzel-Giedion é uma patologia genética rara de etiologia desconhecida e herança autossômica recessiva. Caracteriza-se pela presença de um fácies grotesco, hipoplasia da porção média da face, hipertricose, múltiplas anomalias esqueléticas, malformações cardíacas e renais.As anomalias craniofaciais desta síndrome podem lembrar o fácies de uma doença metabólica de depósito. O objetivo deste relato foi enfatizar a importância da hidronefrose congênita bilateral no diagnóstico da síndrome de Schinzel-Giedion . Descrevemos o primeiro caso brasileiro de um recém-nascido com fácies típico, hipertricose generalizada, anomalias esqueléticas, cardíacas e hidronefrose bilateral, detectada pela ultrassonografia fetal e, posteriormente, confirmada pelo mesmo método. O estudo cromosômico foi normal. Na literatura, de 35 casos descritos, 31 apresentavam hidronefrose, o que constitui um achado fundamental para o diagnóstico da patologia. Dessa forma, acreditamos que se a síndrome de Schinzel-Giedion fosse indexada como uma das causas de hidronefrose congênita, seu diagnóstico seria facilitado, uma vez que a maioria dos outros achados desta síndrome, com exceção da hidronefrose, é inespecífica e comum a diversas outras síndromes genéticas.

Schinzel-Giedion syndrome is a rare autosomal recessive disorder characterized by coarse facies, midface retraction, hypertrichosis, multiple skeletal anomalies, and cardiac and renal malformations. Craniofacial abnormalities of this syndrome sometimes resemble a storage or metabolic disease. The pathogenesis of the disease remains unknown. The objective of this report was to emphasize the importance of congenital bilateral hydronephrosis for the diagnosis of Schinzel-Giedion syndrome. We describe the first Brazilian case of a newborn with typical facies, generalized hypertrichosis, cardiac and skeletal anomalies, and bilateral hydronephrosis detected during pregnancy and confirmed later by abdominal ultrasonography. Chromosomal constitution was normal. Of the 35 cases already reported in the literature, 31 presented hydronephrosis, which is considered an important clue in diagnosis. If Schinzel-Giedion syndrome were indexed as a cause of congenital hydronephrosis, its identification would be greatly facilitated, since the majority of the other findings in Schinzel-Giedion syndrome are nonspecific and common to many genetic syndromes.

OBJETIVO: A síndrome de Noonan é uma patologia de múltiplas anomalias congênitas e, dentre os achados clínicos, a diátese hemorrágica está incluída. O propósito deste estudo é determinar a freqüência de anormalidades hemostáticas nos pacientes afetados. MÉTODO: Nós estudamos 30 pacientes afetados pela síndrome quanto aos aspectos hematológicos que consistiu de tempo de sangramento, tempo de protrombina, tempo de tromboplastina parcial ativada, tempo de trombina, contagem de plaquetas e dosagem do fator de coagulação XI. RESULTADOS: Um resultado laboratorial anormal foi observado em 9 desses pacientes (30%). Apesar dos achados mais comuns terem sido as deficiências dos fatores de coagulação, especialmente do fator XI, também observamos anormalidades no número e na função plaquetária. CONCLUSÕES: Anormalidades hemostáticas são observadas com certa freqüência em pacientes com síndrome de Noonan (30% em nossa amostra). Enfatizamos, portanto, a importância de uma investigação hematológica mais detalhada nesses pacientes, especialmente antes da realização de um procedimento invasivo, o qual é requerido com certa freqüência na síndrome.

OBJECTIVE: Noonan syndrome is a multiple congenital anomaly syndrome, and bleeding diathesis is considered part of the clinical findings. The purpose of this study was to determine the frequency of hemostatic abnormalities in a group of Noonan syndrome patients. METHOD: We studied 30 patients with clinical diagnosis of Noonan syndrome regarding their hemostatic status consisting of bleeding time, prothrombin time, activated partial thromboplastin time and thrombin time tests, a platelet count, and a quantitative determination of factor XI. RESULTS: An abnormal laboratory result was observed in 9 patients (30%). Although coagulation-factor deficiencies, especially factor XI deficiency, were the most common hematological findings, we also observed abnormalities of platelet count and function in our screening. CONCLUSIONS: Hemostatic abnormalities are found with some frequency in Noonan syndrome patients (30% in our sample). Therefore, we emphasize the importance of a more extensive hematological investigation in these patients, especially prior to an invasive procedure, which is required with some frequency in this disorder.

OBJECTIVE - Cardiac evaluation (clinical, electrocardiographic and echocardiographic) of 25 Brazilian patients with clinical diagnosis of Friedreich's ataxia (FA) related to the frequency and the size of GAA repeats (unstable expansion of trinucleotide repeats that results in the disease). METHODS - Clinical and cardiac study including electrocardiogram and echocardiogram of all patients and molecular analysis to detect the frequency and the size of GAA expansion, by polymerase chain reaction analysis. RESULTS - Homozygous GAA expansion was detected in 17 patients (68%) -- all typical cases. In 8 (32%) cases (6 atypical and 2 typical), no GAA expansion was observed, therefore it was not considered Friedreich's ataxia. All patients with GAA expansion (100%) had electrocardiographic abnormalities, and only 25% of the cases without GAA expansion had some abnormality on this exam. However, only 6% of all patients revealed some signals/symptoms suggestive of cardiac involvement. CONCLUSION - A molecular analysis is essential to confirm the diagnosis of Friedreich's ataxia; however, an adequate cardiac evaluation, including an electrocardiogram, was extremely useful to better screening the patients which should perform these molecular analysis.

OBJECTIVE: To evaluate cardiac findings in 31 Noonan syndrome patients. METHODS: Thirty-one (18 males and 13 females)patients from 26 families affected with Noonan's syndrome were evaluated from the cardiac point of view with electrocardiography and echodopplercardiography. RESULTS: Twenty patients had some type of cardiac abnormality. The most frequent was pulmonary valve stenosis followed by hypertrophic myocardiopathy, commonly associated with valve defects. Upper deviation of the QRS axis was observed in 80% of these patients. CONCLUSION: In view of the high frequency and diversity of cardiac abnormalities present in Noonan syndrome, cardiac evaluation with electrocardiography and echocardiography should be performed in all patients diagnostically suspected of having this disease.

A disponibilidade de um serviço de genética em hospitais deveria ser uma questão de interesse público. A genética pode abreviar o período gasto na formulação de diagnósticos, reduzir o tempo médio de internação, antecipar a escolha de tratamentos adequados, impedir ou minimizar possíveis seqüelas e, desta forma, reduzir os custos. O objetivo do presente estudo foi descrever o fechamento, em 1996, do setor de genética do Hospital Infantil Menino Jesus, de São Paulo, SP, Brasil. Realizou-se uma análise retrospectiva do trabalho desenvolvido naquele setor entre 1992 e 1996, com ênfase na detecção de anormalidades cromossômicas. De todos os casos avaliados no período, 571 foram codificados em banco de dados. Alguma anormalidade cromossômica foi observada em 20% dos 350 cariótipos realizados. A presença de um serviço de genética em hospitais minimiza o surgimento de manifestações clínicas em portadores de distúrbios genéticos, melhora a qualidade de vida desses pacientes e permite que eles recebam informação sobre o risco de recorrência, além de evitar desperdícios decorrentes da realização inadequada de exames caros. Tais benefícios justificam o investimento necessário para que este tipo de serviço funcione.

The availability of genetics services in hospitals should be an issue of public concern. Having genetics services helps shorten the time spent in making diagnoses and reduces the average number of inpatient days; it also helps accelerate the choice of adequate treatments, prevents or minimizes sequelae, and, ultimately, reduces costs. The objective of the present study was to describe the closing down in 1996 of the genetics division at the Menino Jesus Children's Hospital, a pediatric institution located in the city of São Paulo, SP, Brazil. A retrospective analysis was carried out of the work performed by this division between 1992 and 1996, with an emphasis on the detection of chromosomal abnormalities. Of all cases assessed during the study period, 571 were entered into a database. Some kind of chromosomal abnormality was observed in 20% of the 350 karyotypes performed. The existence of genetics services in hospitals helps minimize the appearance of clinical symptoms in carriers of genetic abnormalities, improves the quality of life of these patients, and enables them to receive information regarding risk of recurrence, while preventing the waste of resources that results from tests that are costly and unnecessary. Such benefits amply justify the investment in setting up genetics services of the type described here.

A síndrome de Noonan é uma patologia de múltiplas anomalias congênitas, herdada em um padrão de herança autossômico dominante. Estudamos 31 pacientes (18 do sexo masculino e 13 do sexo feminino) afetados por essa síndrome quanto aos aspectos clínicos e genéticos. As características clínicas mais freqüentemente observadas foram a baixa estatura (71%); os dismorfismos craniofaciais, principalmente o hipertelorismo, a ptose e a inclinação ínfero-lateral das fendas palpebrais; o pescoço curto ou alado (87%); as anomalias cardíacas (65%) e a presença de coxins nas pontas dos dedos das mãos e pés (70%). Após estudarmos os parentes de primeiro grau dos probandos, fizemos o diagnóstico da Síndrome de Noonan em um deles em três famílias. Portanto, a maioria dos nossos casos foram esporádicos.

Noonan syndrome is a multiple congenital anomaly syndrome, inherited in an autosomal dominant pattern. We studied 31 patients (18 males and 13 females) affected by this disorder regarding their clinical and genetic characteristics. The most frequent clinical findings were short stature (71%); craniofacial dysmorphisms, especially hypertelorism, ptosis, downslanting of the palpebral fissures; short or webbed neck (87%); cardiac anomalies (65%), and fetal pads in fingers and toes (70%). After studying the probands' first-degree relatives, we made the diagnosis of Noonan syndrome in more than one family member in three families. Therefore, the majority of our cases were sporadic.