Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 8 de 8
Filter
1.
Arq. bras. endocrinol. metab ; 58(3): 292-300, abr. 2014. tab, graf
Article in English | LILACS | ID: lil-709355

ABSTRACT

Objective : Current guidelines have advised against the performance of 131I-iodide diagnostic whole body scintigraphy (dxWBS) to minimize the occurrence of stunning, and to guarantee the efficiency of radioiodine therapy (RIT). The aim of the study was to evaluate the impact of stunning on the efficacy of RIT and disease outcome.Subjects and methods : This retrospective analysis included 208 patients with differentiated thyroid cancer managed according to a same protocol and followed up for 12-159 months (mean 30 ± 69 months). Patients received RIT in doses ranging from 3,700 to 11,100 MBq (100 mCi to 300 mCi). Post-RIT-whole body scintigraphy images were performed 10 days after RIT in all patients. In addition, images were also performed 24-48 hours after therapy in 22 patients. Outcome was classified as no evidence of disease (NED), stable disease (SD) and progressive disease (PD).Results : Thyroid stunning occurred in 40 patients (19.2%), including 26 patients with NED and 14 patients with SD. A multivariate analysis showed no association between disease outcome and the occurrence of stunning (p = 0.3476).Conclusion : The efficacy of RIT and disease outcome do not seem to be related to thyroid stunning. Arq Bras Endocrinol Metab. 2014;58(3):292-300.


Objetivo : As diretrizes atuais alertam contra a execução da cintigrafia de corpo inteiro com iodo-131 (dxWBS) para minimizar a ocorrência de atordoamento e garantir a eficiência do tratamento com radioiodo (RIT). O objetivo deste estudo foi avaliar o impacto do atordoamento sobre a eficácia do RIT e desfechos da doença.Sujeitos e métodos : Esta análise retrospectiva incluiu 208 pacientes com câncer diferenciado de tireoide submetidos ao mesmo protocolo e acompanhados por 12-159 semanas (média de 30 ± 69 meses). Os pacientes receberam RIT com doses variando de 3.700 a 11.100 MBq (100 mCi a 300 mCi). As imagens da cintigrafia após a RIT foram feitas 10 dias depois da RIT em todos os pacientes. Além disso, as imagens foram também obtidas após 24-48h em 22 pacientes. O desfecho foi classificado como nenhuma evidência de doença (NED), doença estável (SD) e doença progressiva (PD).Resultados : O atordoamento da tireoide ocorreu em 40 pacientes (19,2%), incluindo 26 pacientes com NED e 14 pacientes com SD. A análise multivariada não mostrou associação entre o desfecho da doença e a ocorrência de atordoamento (p = 0,3476).Conclusão : A eficácia da RIT e o desfecho da doença não parecem estar relacionados com o atordoamento da tireoide. Arq Bras Endocrinol Metab. 2014;58(3):292-300.


Subject(s)
Adult , Female , Humans , Male , Middle Aged , Adenocarcinoma, Follicular/radiotherapy , Carcinoma, Papillary/radiotherapy , Iodine Radioisotopes/therapeutic use , Thyroid Gland , Thyroid Neoplasms/radiotherapy , Disease Progression , Iodine Radioisotopes/administration & dosage , Multivariate Analysis , Retrospective Studies , Thyroidectomy , Treatment Outcome , Thyroid Gland/surgery , Thyroid Neoplasms/classification , Whole Body Imaging
2.
Arq. bras. endocrinol. metab ; 54(9): 807-812, dez. 2010. ilus, tab
Article in English | LILACS | ID: lil-578361

ABSTRACT

OBJECTIVE: Evaluate the efficacy of cumulative doses (CDs) of 131I-iodide therapy (RIT) in differentiated thyroid cancer (DTC). SUBJECTS AND METHODS: The probability of progressive disease according to CDs was evaluated in patients < 45 years old and > 45 years old and correlated to tumor-node-metastasis (TNM), thyroglobulin values, histological types and variants, age, and zduration of the disease. RESULTS: At the end of a follow-up period of 69 ± 56 months, 85 out of 150 DTC patients submitted to fixed doses RIT had no evidence of disease, 47 had stable disease and 18 had progressive disease. Higher CDs were used in the more aggressive variants (p < 0.0001), higher TNM stages (p < 0.0001), and follicular carcinomas (p = 0.0034). Probability of disease progression was higher with CDs > 600 mCi in patients > 45 years old and with CDs > 800 mCi in patients < 45 years. CONCLUSION: Although some patients may still respond to high CDs, the impact of further RIT should be carefully evaluated and other treatment strategies may be warranted.


OBJETIVO: Avaliar a eficácia de doses cumulativas (DCs) da terapia com iodeto-131I (RIT) no câncer diferenciado de tiroide (CDT). SUJEITOS E MÉTODOS: A probabilidade de doença em progressão conforme a DC foi calculada em pacientes com idade < 45 e > 45 anos e correlacionada com o TNM, valores de tiroglobulina sérica, tipos histológicos e variantes, idade e tempo de doença. RESULTADOS: Ao final de um seguimento de 69 ± 56 meses, 85 dos 150 pacientes CDT submetidos a doses fixas de RIT não tinham evidência de doença, 47 tinham doença estável e 18, doença progressiva. DCs mais elevadas foram usadas nas variantes agressivas (p < 0,0001), maior estágio TNM (p < 0,0001) e nos carcinomas foliculares (p = 0,0034). A probabilidade de doença em progressão foi maior com DCs > 600 mCi em pacientes > 45 anos e com DCs > 800 mCi em pacientes < 45 anos. CONCLUSÃO: Apesar de alguns pacientes ainda responderem a altas DCs, o impacto de RITs deve ser cuidadosamente avaliado e outras estratégias terapêuticas devem ser consideradas.


Subject(s)
Female , Humans , Male , Middle Aged , Carcinoma, Papillary/radiotherapy , Iodine Radioisotopes/administration & dosage , Thyroid Neoplasms/radiotherapy , Carcinoma, Papillary/metabolism , Carcinoma, Papillary/secondary , Disease Progression , Dose-Response Relationship, Radiation , Epidemiologic Methods , Iodine Radioisotopes/adverse effects , Treatment Outcome
3.
Rev. bras. mastologia ; 17(3): 127-135, set. 2007. ilus
Article in Portuguese | LILACS | ID: lil-551565

ABSTRACT

Nos últimos anos, a aplicação da tomografia por emissão de pósitrons (PET) com fluordesoxiglicose-18F (FDG-18F) tem melhorado significativamente a condução de pacientes com diferentes neoplasias malignas. Já se demonstrou que a associação das imagens metabólicas da PET com imagens de métodos anatômicos, como TC, pode aumentar a acurácia da PET isolada. Em nosso meio, esses equipamentos híbridos de PET/TC têm-se tornado cada vez mais disponíveis, ampliando a aplicação dessa metodologia em pacientes oncológicas. Nesta revisão, os possíveis impactos da PET e da PET/TC no manejo de pacientes com câncer de mama no diagnóstico primário, estadiamento pré-operatório, reestadiamento e na avaliação da resposta ao tratamento serão abordados. Apesar de alguns estudos terem demonstrado sua acurácia na detecção do tumor primário e no estadiamento axilar, as suas aplicações clínicas mais importantes têm sido na detecção e na definição da extensão do câncer de mama recorrente ou metastático e para a avaliação da resposta à terapia. No estadiamento, PET tem sido usada de forma complementar aos métodos convencionais de estadiamento, já que apresenta maior sensibilidade para a detecção de metástases linfonodais e osteolíticas; no entanto, não deve ser considerado um substituto para os estudos convencionais que incluem TC e cintilografia óssea.


Over the last few years, the widespread use of positron emission tomography has improved markedly the management of patients with various malignancies. It has been demonstrated, meanwhile, that the co-registration or fusion of the metabolic images obtained by PET with morphological images, such as computed tomography, improves the accuracy of stand alone PET imaging. These hybrid PET / CT equipments are becoming more and more available in Brazil, therefore increasing the use of this methodology in oncologic patients among us. In this review, we evaluate the possible impact of PET and PET / CT on the management of patients with breast cancer, with respect to primary diagnosis, preoperative staging, disease re-staging and treatment monitoring. Although studies have already proven the accuracy of PET in detecting the primary breast tumor and in axillary staging, its most important clinical applications are in re-staging, in the detection of distant metastases and in treatment monitoring. In tumor staging, PET has been used as a complementary tool to conventional imaging modalities due to its increased sensitivity in detecting nodal and lytic bone metastases; however, it should not be regarded as a substitute to conventional staging methods, including CT and bone scan.


Subject(s)
Humans , Female , Neoplasm Metastasis/diagnosis , Breast Neoplasms/diagnosis , Positron-Emission Tomography/methods , Early Diagnosis , /therapeutic use , Neoplasm Staging , Breast Neoplasms/prevention & control , Neoplasm Recurrence, Local/diagnosis , Treatment Outcome , Tamoxifen/therapeutic use
4.
Arq. neuropsiquiatr ; 62(1): 1-8, mar. 2004. ilus, tab
Article in English | LILACS | ID: lil-357826

ABSTRACT

Lesões cerebrais destrutivas unilaterais ocorridas em fase precoce do desenvolvimento podem resultar em espessamento compensatório da calota craniana ipsilateral. O objetivo deste estudo foi determinar a freqüência destas alterações ósseas em pacientes com epilepsia e lesões destrutivas precoces e avaliar se há associação entre estas alterações e lateralização de descargas epileptiformes. Foram analisados EEGs interictais / ictais e espessura do crânio pela RM de 51 pacientes. Os pacientes foram divididos em três grupos de acordo com a distribuição topográfica da lesão à RM: hemisférico (H) (n=9); território arterial (AT) (n=25); fronteira arterial (Bdz) (n=17). A atividade de base no EEG foi anormal em 26 pacientes e foi mais freqüente entre os pacientes do grupo H (p=0,044). Espessamento unilateral da calota craniana foi mais freqüente entre os pacientes do grupo H (p=0,004). Cinco pacientes (9,8 por cento) apresentaram discordância lateralizatória entre as descargas epileptiformes e lesão estrutural (quatro deles com atividade de base anormal, e apenas dois deles com espessamento da calota craniana). Em um destes pacientes, o SPECT ictal revelou forte evidência de falsa lateralização pelo EEG. Os achados sugerem que o espessamento compensatório da calota craniana é mais freqüente entre pacientes com lesões unilaterais e extensas. No entanto, a lateralização de descargas epileptiformes parece estar mais relacionada ao grau de alteração da atividade de base e extensão da lesão cerebral do que às alterações ósseas.


Subject(s)
Middle Aged , Adolescent , Adult , Humans , Male , Female , Brain , Epilepsy , Functional Laterality , Skull , Brain , Brain Infarction , Electroencephalography , Epilepsy , Magnetic Resonance Imaging , Skull , Tomography, Emission-Computed, Single-Photon
5.
Int. braz. j. urol ; 29(6): 507-516, Nov.-Dec. 2003. ilus, tab, graf
Article in English | LILACS | ID: lil-364405

ABSTRACT

PURPOSE: Renal scintigraphy has been used for many years in the evaluation of renal transplants and can help in the diagnosis of graft complications, leading to prompt clinical management and preventing further deterioration of renal function. The purpose of this study was to evaluate the overall accuracy of renal scintigraphy with 99mTc-DTPA in the diagnosis of acute renal graft complications. MATERIALS AND METHODS: Seventy-six scintigraphic studies performed in 55 patients (ages ranging from 6 to 65 years), were reviewed. Scintigraphy results were compared to biopsies performed within 5 days of imaging. 99mTc-DTPA study was performed within a mean time of 19 days after kidney transplants. Dynamic images were performed in the anterior position of the abdomen and pelvis every 2 seconds for 80 seconds (flow phase) and every 15 seconds for 30 minutes (functional phase), after an intravenous injection of 370 MBq (10 mCi) of 99mTc-DTPA. RESULTS: The scintigraphic results were concordant with the biopsies in 86% of the cases studied. The sensitivities of renal scintigraphy for detection of acute tubular necrosis (ATN), acute rejection (AR) and cortical necrosis (CN) were 98%, 87% and 100%, respectively. Specificities and accuracies for detection of ATN, AR and CN were 89%, 86% and 100%, and 95%, 87% and 100%, respectively. CONCLUSION: Renal scintigraphy with 99mTc-DTPA showed a good overall accuracy in the detection of acute renal graft complications. It can be used as a reliable tool in the routine evaluation of these patients.

6.
Rev. imagem ; 22(1): 47-8, jan.-mar. 2000. ilus
Article in Portuguese | LILACS | ID: lil-259947

ABSTRACT

O melanoma maligno é um dos poucos tumores que podem causar hipercalcemia como síndrome paraneoplásica. Este relato demonstra a utilidade da cintilografia com MDP-99mTC no diagnóstico desta síndrome. A captaçäo difusa e acentuada do radiofármaco em partes moles, associada à presença de múltiplas metástases ósseas, levou à hipótese de hipercalcemia por síndrome paraneoplásica e, posteriormente, ao diagnóstico final de melanoma maligno


Subject(s)
Humans , Male , Adult , Bone and Bones , Hypercalcemia/etiology , Melanoma/complications , Paraneoplastic Syndromes/complications , Bone Neoplasms , Radiopharmaceuticals , Middle Lobe Syndrome , Neoplasm Metastasis , Radiography, Thoracic
7.
Arq. neuropsiquiatr ; 57(4): 1005-10, dez. 1999. ilus
Article in English | LILACS | ID: lil-249302

ABSTRACT

The clinical and neurological finThdings of three neonates with the diagnosis of cerebrovascular disease que reported. The neuropsychological evaluation disclosed impairment of fine motor function, coordination, language, perception and behavioral disturbances. Brain SPECT imaging revealed perfusional deficits in the three cases.


Subject(s)
Humans , Male , Infant, Newborn , Female , Cerebrovascular Disorders , Tomography, Emission-Computed, Single-Photon , Brain , Stroke
8.
Arq. neuropsiquiatr ; 57(3B): 863-6, set. 1999. ilus
Article in English | LILACS | ID: lil-247398

ABSTRACT

Olanzapine, an atypical antipsychotic drug, was administered to a patient with Huntington's disease (HD) with marked choreiform movements. Brain SPECT with (99m)Tc-HMPO was performed before and after treatment. Brain SPECT imaging has been performed in patients with HD in order to determine the status of basal ganglia perfusion. The use of brain SPECT with (99m)Tc-HMPAO before and after treatment in patients with HD has not been yet reported. The marked hypoperfusion of the basal ganglia on brain SPECT performed before therapy with olanzapine improved significantly after treatment.


Subject(s)
Humans , Female , Adult , Antipsychotic Agents/therapeutic use , Brain , Huntington Disease/drug therapy , Pirenzepine/therapeutic use , Tomography, Emission-Computed, Single-Photon , Huntington Disease , Technetium/therapeutic use
SELECTION OF CITATIONS
SEARCH DETAIL