Asunto(s)
Brazo , Astrocitoma/diagnóstico por imagen , Encefalopatías Metabólicas/diagnóstico por imagen , Lóbulo Parietal/diagnóstico por imagen , Tomografía de Emisión de Positrones , Temblor/etiología , Astrocitoma/complicaciones , Astrocitoma/fisiopatología , Encefalopatías Metabólicas/complicaciones , Encefalopatías Metabólicas/fisiopatología , Fluorodesoxiglucosa F18 , Humanos , Masculino , Persona de Mediana Edad , Lóbulo Parietal/fisiopatología , Radiofármacos , Resultado del Tratamiento , Temblor/fisiopatologíaAsunto(s)
Huesos/diagnóstico por imagen , Insuficiencia Cardíaca/complicaciones , Derrame Pericárdico/diagnóstico por imagen , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Radioisótopos de Indio , Masculino , Osteomielitis/diagnóstico por imagen , Sepsis/complicaciones , Infecciones Estafilocócicas/complicaciones , Staphylococcus aureus , Tomografía Computarizada de EmisiónRESUMEN
PURPOSE: Renovascular hypertension is an unusual cause of elevated mean arterial pressure in children. When suspected, angiotensin-converting enzyme inhibitor-enhanced renal scintigraphy is usually one of the initial studies done to evaluate patients. The accuracy of this test depends not only on patient selection but also on technical factors involved in performing the study. We report a case of a false-positive angiotensin-converting enzyme inhibitor-enhanced radionuclide renogram in a 5-year-old boy with hypertension. METHODS: Angiotensin-converting enzyme inhibitor-enhanced renal scintigraphy was performed and the result was interpreted as positive for bilateral renovascular disease. A review of the anesthesia record from the study revealed that the patient was hypotensive. A repeated study with adequate hydration and blood pressure stability was then done. RESULTS: The result of the second examination was interpreted as normal, without evidence of abnormal renovascular physiology. CONCLUSIONS: The cause of the initial false-positive result was determined to be dehydration with secondary hypotension. Dehydration, with secondary hypotension, can cause a diminished glomerular filtration rate and mimic bilateral renovascular physiology on angiotensin-converting enzyme inhibitor-enhanced renal scans.
Asunto(s)
Inhibidores de la Enzima Convertidora de Angiotensina , Antihipertensivos , Captopril , Deshidratación/complicaciones , Hipertensión Renovascular/diagnóstico por imagen , Riñón/diagnóstico por imagen , Anestesia General , Presión Sanguínea/fisiología , Preescolar , Deshidratación/fisiopatología , Diagnóstico Diferencial , Enalapril , Reacciones Falso Positivas , Fluidoterapia , Tasa de Filtración Glomerular/fisiología , Humanos , Hipnóticos y Sedantes/administración & dosificación , Hipotensión/etiología , Masculino , Cintigrafía , Radiofármacos , Tecnecio Tc 99m MertiatidaRESUMEN
An autopsy was performed on a patient who died after receiving 89Sr-chloride for treatment of bone pain from metastatic prostate carcinoma. Coordination between nuclear medicine physicians, radiation safety division personnel and pathologists resulted in minimal radiation exposure and the acquisition of dosimetry data.
Asunto(s)
Autopsia , Monitoreo del Ambiente , Exposición Profesional , Radioisótopos de Estroncio/análisis , Estroncio/análisis , Anciano , Anciano de 80 o más Años , Neoplasias Óseas/radioterapia , Neoplasias Óseas/secundario , Resultado Fatal , Humanos , Masculino , Neoplasias de la Próstata/patología , Neoplasias de la Próstata/radioterapia , Ropa de Protección , Estroncio/uso terapéutico , Radioisótopos de Estroncio/uso terapéutico , Recuento Corporal TotalRESUMEN
The U.S. Food and Drug Administration regulates the manufacture and distribution of 18F-FDG. Acquisition and use of this radiopharmaceutical for myocardial imaging at our institution required approval by our Institutional Review Board. Our initial objective was to present a scientific validation for use of this radiopharmaceutical in adjudicating the "viable versus scarred myocardium question," using either a PET scanner or a gamma camera equipped with 511-keV collimators. We believe that our nuclear medicine colleagues who find themselves in a similar business/legal situation regarding the acquisition and use of 18F-FDG will find this review useful. We reviewed the literature to document the efficacy of 18F-FDG, in general, in assessing myocardial viability. We then did a literature-based comparison of PET scanner methodology versus modified gamma camera methodology for imaging 18F-FDG emissions. Imaging 18F-FDG with a modified gamma camera appears to be an effective alternative to imaging with a standard PET camera for assessing myocardial viability.
Asunto(s)
Radioisótopos de Flúor , Fluorodesoxiglucosa F18 , Corazón/diagnóstico por imagen , Isquemia Miocárdica/diagnóstico por imagen , Radiofármacos , Tomografía Computarizada de Emisión de Fotón Único , Tomografía Computarizada de Emisión , Cámaras gamma , HumanosRESUMEN
A 53-year-old man presented for evaluation of nocturnal chest pain, consistent with angina pectoris. An exercise stress test reproduced his symptoms, however, exercise electrocardiograms were nondiagnostic. An exercise-thallium perfusion study confirmed vasospasm as the cause. This knowledge guided subsequent successful medical therapy.