Asunto(s)
Enfermedades de las Vías Biliares/diagnóstico por imagen , Sistema Biliar/diagnóstico por imagen , Hepatopatías/diagnóstico por imagen , Hígado/diagnóstico por imagen , Adulto , Compuestos de Anilina , Niño , Glicina , Humanos , Iminoácidos , Compuestos de Organotecnecio , Cintigrafía , Radiofármacos , Disofenina de Tecnecio Tc 99mRESUMEN
In the last 15 years, a new environmental health concern has emerged: electric and magnetic fields (EMF) associated with 60 hertz (Hz), alternating current (AC) electricity. Because recent reports in the popular press have stirred public attention, patients may well ask their physicians about it. The Soviets were the first to speculate about health effects from electric fields in the early 1970s. Other studies followed throughout the '70s and '80s. Public debate has grown to include concerns about household electrical appliances.
Asunto(s)
Campos Electromagnéticos/efectos adversos , Salud Ambiental , Estudios de Evaluación como Asunto , HumanosRESUMEN
Colonic varices is a rare condition, generally associated with portal hypertension, which normally presents as acute, severe, gastrointestinal blood loss. A case is presented in which the varicosities were observed serendipitously in a patient with a pancreatic tumor, in whom the bleeding was not variceal but due to two small unrelated gastric hemangiomas. The literature is reviewed and scintigraphic features described.
Asunto(s)
Colon/irrigación sanguínea , Eritrocitos , Tecnecio , Várices/diagnóstico por imagen , Anciano , Anciano de 80 o más Años , Femenino , Humanos , CintigrafíaRESUMEN
Localization of radionuclide activity in the gallbladder was seen on delayed views following injection of 99mTc-labeled red blood cells for gastrointestinal bleeding in five patients. The mechanism for this unusual finding probably relates to labeling of heme, the biochemical precursor of bilirubin. All patients had had prior transfusions. All but one had severe renal impairment, probably an important predisposing factor.
Asunto(s)
Vesícula Biliar/diagnóstico por imagen , Hemorragia Gastrointestinal/diagnóstico por imagen , Tecnecio , Adulto , Anciano , Transfusión Sanguínea , Eritrocitos , Femenino , Hemo , Humanos , Masculino , Cintigrafía , Factores de Tiempo , Uremia/complicacionesRESUMEN
During 1985, low-level radioactive waste disposal has become a critical concern. The issue has been forced by the threatened closure of the three commercial disposal sites. The medical community has used radioactive isotopes for decades in nuclear medicine, radiation therapy, radioimmunoassay, and biomedical research. Loss of disposal capacity for radioactive wastes generated by these activities, by the suppliers of radioisotopes, and by pharmaceutical companies will have a profound impact on the medical profession.
Asunto(s)
Residuos Radiactivos , Eliminación de Residuos , Legislación como Asunto , Medicina Nuclear , Radioisótopos , Estados UnidosRESUMEN
Radionuclide cerebral imaging (RCI) is a commonly used technique for detection of intracranial blood flow in patients with clinically suspected brain death. In 115 studies performed on 95 patients in a six-year period at the Geisinger Medical Center, a number of variant flow patterns have been observed. Although all have been described previously, there has been no review of these patterns on studies performed for brain death. The significance of normal blood flow, absent blood flow, isolated superior sagittal sinus activity, luxury perfusion, hypoperfusion, hemiperfusion, and jugular venous reflux is discussed. Any demonstrable intracranial blood pool activity is presently considered to counter a diagnosis of brain death, except that jugular reflux renders an examination uninterpretable. Technique must be top quality but, even so, RCI cannot evaluate basilar brain flow. Nonetheless, RCI is a valuable adjunct in helping to establish the clinical diagnosis of brain death.
Asunto(s)
Muerte Encefálica , Encéfalo/diagnóstico por imagen , Circulación Cerebrovascular , Adolescente , Adulto , Encéfalo/irrigación sanguínea , Niño , Femenino , Humanos , Masculino , Persona de Mediana Edad , Cintigrafía , Pertecnetato de Sodio Tc 99mRESUMEN
Nine children with clinically suspected brain death were evaluated by radionuclide cerebral imaging and four-vessel dye contrast cerebral arteriography. The scans showing absence of cerebral blood flow were verified by arteriography in all children. There was complete agreement in all cases. It was concluded that failure to detect cerebral blood flow by radionuclide cerebral imaging in children is a valid demonstration of absence of cerebral circulation for purposes of determining brain death. The scan is significantly less expensive than dye-contrast arteriograms. The test is portable, and thus it eliminates the need for transportation of extraordinarily ill patients. The scanning technique is noninvasive and may be particularly helpful in the diagnosis of brain death in patients in whom intravenous infusions of barbiturate might otherwise obscure the clinical and EEG examination.
Asunto(s)
Muerte Encefálica , Encéfalo/diagnóstico por imagen , Adolescente , Apnea/etiología , Angiografía Cerebral , Circulación Cerebrovascular , Niño , Preescolar , Humanos , Lactante , CintigrafíaRESUMEN
Increased participation in sports by the general public has led to an increase in sports-induced injuries, including stress fractures, shin splints, arthritis, and a host of musculotendinous maladies. Bone scintigraphy with Tc-99m MDP has been used with increasing frequency in detecting stress fractures, but this study can miss certain important conditions and detect other lesions of lesser clinical significance. This paper demonstrates the spectrum of findings on bone scanning in nonacute sports trauma and offers suggestions for the optimal use of Tc-99m MDP for detecting the causes of lower extremity pain in athletes.