RESUMEN
Quantitative ultrasound (QUS) of the calcaneus correlates modestly with axial dual-energy X-ray absorptiometry (DXA). Because bone mineral density (BMD) might be influenced by vitamin D status, we assessed the correlation between both techniques in 56 Arabian women, a population with high prevalence of hypovitaminosis D. The speed of sound (SOS), broadband ultrasound attenuation (BUA), and estimated BMD of the right calcaneus were determined by QUS. Spine and right hip BMD were measured by DXA scan. The serum 25-hydroxyvitamin D (25OHD) level was measured by radioimmunoassay. The correlations of QUS parameters (estimated calcaneal BMD, BUA, and SOS) with spine and hip BMD were modest (r = 0.50, r = 0.53, r = 0.41 for the spine and r = 0.54, r = 0.56, and r = 0.46 for the hip, respectively; p < 0.01 for all comparisons), but stronger in postmenopausal women. All postmenopausal women with low estimated calcaneal BMD (T-score pound -1) had a T-score pound -1 by DXA of the spine or hip. Of the 21 premenopausal women with spine or hip T-score pound -1 who had 25OHD measurements, 20 (95.2%) had levels below 50 nmol/L and 12 (57%) had levels below 30 nmol/L. The subgroup with 25OHD < 30 nmol/L had significantly lower spine (p < 0.01) and hip BMD (p < 0.05) than the subgroup with 25OHD >/= 30 nmol/L. QUS parameters were not significantly different between the two subgroups. The QUS and DXA correlated modestly well in women with prevalent hypovitaminosis D. QUS could be used in postmenopausal women with hypovitaminosis D to identify those at risk for osteoporotic fracture.
Asunto(s)
Densidad Ósea , Calcáneo/diagnóstico por imagen , Osteoporosis/diagnóstico , Deficiencia de Vitamina D/epidemiología , Absorciometría de Fotón , Adulto , Anciano , Femenino , Cadera/diagnóstico por imagen , Humanos , Persona de Mediana Edad , Osteoporosis/etiología , Prevalencia , Columna Vertebral/diagnóstico por imagen , Estadísticas no Paramétricas , Ultrasonografía , Emiratos Árabes Unidos/epidemiología , Deficiencia de Vitamina D/complicacionesRESUMEN
OBJECTIVES: To determine factors influencing quantitative ultrasound (QUS) parameters of the calcaneus in a population-based sample of United Arab Emirates (UAE) women, and to compare QUS parameters of the calcaneus for healthy young UAE women with the manufacturer's reference ranges for other populations. METHODS: All subjects completed a questionnaire on reproductive and life style factors. Height and weight were measured, and body composition was determined by bioelectric impedence. Estimated bone mineral density (BMD), Speed of sound (SOS), broadband ultrasound attenuation (BUA) and quantitative ultrasound index (QUI) of the right calcaneus were determined by Sahara ultrasound. RESULTS: In premenopausal women (n=330), age, weight, body mass index (BMI), lean weight, fat weight, education, age at menarche, and number of pregnancies, correlated significantly with QUS parameters. Multiple regression analysis showed that age at menarche, number of pregnancies, and BMI, were the best predictors of QUS parameters although these factors explained only small amounts of the variance (R(2)=0.05). In postmenopausal women (n=81), age, BMI and physical activity were the best predictors of BUA (R(2)=0.35), SOS (R(2)=0.39), and QUI (R(2)=0.43). Mean estimated BMD, QUI and SOS for healthy young UAE women were significantly lower than the manufacturer's reference ranges for U.S. Caucasian, European Caucasian, and Chinese Asian healthy young women of the same age range (P<0.001 for all comparisons). Mean BUA was not significantly different, however. CONCLUSIONS: Menopausal status, age, BMI and physical activity are strong predictors of QUS parameters of the calcaneus in Arabian women. Healthy young Arabian women have lower estimated calcaneal BMD compared with the manufacturer's reference ranges for other populations.
Asunto(s)
Constitución Corporal , Calcáneo/diagnóstico por imagen , Estilo de Vida , Absorciometría de Fotón , Adulto , Composición Corporal , Densidad Ósea , Femenino , Humanos , Hidroxicolecalciferoles/sangre , Persona de Mediana Edad , Osteoporosis Posmenopáusica/epidemiología , Paridad , Posmenopausia , Premenopausia , Valores de Referencia , Análisis de Regresión , UltrasonografíaRESUMEN
The bone mineral density (BMD) of the calcaneus was estimated in 185 young women from the United Arab Emirates, using SAHARA ultrasound. All participants completed a questionnaire on factors potentially associated with osteoporosis. In all, 29 (15.7%) of the women were classified as having osteopenia and none as having osteoporosis. Participants with osteopenia were more likely to have had a later onset of menarche, irregular periods, lower body mass index, and a positive family history of osteoporosis. Only late menarche and low body mass index, however, were independent predictors of osteopenia.
Asunto(s)
Densidad Ósea , Calcáneo/diagnóstico por imagen , Osteoporosis/diagnóstico por imagen , Osteoporosis/etiología , Adulto , Índice de Masa Corporal , Calcio de la Dieta , Estudios Transversales , Ejercicio Físico , Femenino , Encuestas Epidemiológicas , Humanos , Estilo de Vida , Modelos Logísticos , Tamizaje Masivo , Menarquia , Análisis Multivariante , Osteoporosis/epidemiología , Valor Predictivo de las Pruebas , Valores de Referencia , Historia Reproductiva , Medición de Riesgo , Factores de Riesgo , Encuestas y Cuestionarios , Ultrasonografía , Emiratos Árabes Unidos/epidemiologíaRESUMEN
The bone mineral density [BMD] of the calcaneus was estimated in 185 young women from the United Arab Emirates, using SAHARA ultrasound. All participants completed a questionnaire on factors potentially associated with osteoporosis. In all, 29 [15.7%] of the women were classified as having osteopenia and none as having osteoporosis. Participants with osteopenia were more likely to have had a later onset of menarche, irregular periods, lower body mass index, and a positive family history of osteoporosis. Only late menarche and low body mass index, however, were independent predictors of osteopenia
Asunto(s)
Índice de Masa Corporal , Densidad Ósea , Calcáneo , Calcio de la Dieta , Estudios Transversales , Valor Predictivo de las Pruebas , Historia Reproductiva , Medición de Riesgo , OsteoporosisRESUMEN
BACKGROUND: This study investigates the rate of cerebral blood flow (rCBF) in Arab patients wth depression. METHODS: Forty-four patients with DSM-III-R major depressive disorders were studied at rest using single photon emission computerized tomography (SPECT) with 99m Tc-HMPAO in comparison with 20 normal controls. All patients were assessed using the Hamilton Rating Scale for Depression (HRSD). RESULTS: The depressed group showed greater rCBF in left and right posterior frontal and parietal cortical regions than normal controls. Within the depressed group, patients with the least severe illness (HRSD < 20) had significantly lower rCBF than normal controls, whilst those with moderately severe (HRSD 20-29) and severe (HRSD > 30) had significantly greater rCBF in most cortical regions than normal controls. Symptom scores, derived from the HRSD were predicted by rCBF principally increased rCBF in the left frontal cortex. CONCLUSIONS: These results suggest a generalized cerebral activation principally in the frontal cortex which is in contrast to the results of most previous studies but more in line with the results of studies of induced affect and some studies of depression subsyndromes.
Asunto(s)
Encéfalo/diagnóstico por imagen , Trastorno Depresivo/diagnóstico por imagen , Radiofármacos/uso terapéutico , Exametazima de Tecnecio Tc 99m/uso terapéutico , Adulto , Mundo Árabe , Circulación Cerebrovascular , Trastorno Depresivo/fisiopatología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Índice de Severidad de la Enfermedad , Tomografía Computarizada de Emisión de Fotón ÚnicoAsunto(s)
Enfermedades de los Ganglios Basales/etiología , Calcinosis/etiología , Epilepsia/etiología , Hipoparatiroidismo/complicaciones , Enfermedades de los Ganglios Basales/diagnóstico , Calcinosis/diagnóstico , Niño , Electroencefalografía , Epilepsia/diagnóstico , Femenino , Humanos , Imagen por Resonancia Magnética , Exametazima de Tecnecio Tc 99m , Tomografía Computarizada de Emisión de Fotón ÚnicoRESUMEN
Diffuse and focal changes in glucose utilization and abnormal cerebral cortical perfusion were found in West syndrome by PET and SPECT investigations. In this study 99mTc-HMPAO SPECT was performed on seven patients with symptomatic West syndrome several months after the onset of the spasms. Regions of interest of the cerebral cortex and cerebellum were delineated by an automated computer program and cortical/cerebellar ratios of the HMPAO uptake in the patients were compared to those of controls. The basal ganglia/cerebellar ratios were compared after manual placement of regions of interest. Significantly reduced perfusion was found in the bilateral anterior, mid frontal and perisylvian cortex, and in the left posterior frontal and temporal areas. Well localized, focal changes in the cortical perfusion were not found and the perfusion in the basal ganglia proved to be normal. These abnormalities in the cortical perfusion may reflect a pre-existing brain pathology together with an encephalopathy due to the hypsarrhythmia and infantile spasms.
Asunto(s)
Cerebelo/irrigación sanguínea , Corteza Cerebral/irrigación sanguínea , Espasmos Infantiles/diagnóstico por imagen , Cerebelo/diagnóstico por imagen , Corteza Cerebral/diagnóstico por imagen , Preescolar , Femenino , Humanos , Lactante , Masculino , Compuestos de Organotecnecio , Oximas , Exametazima de Tecnecio Tc 99m , Tomografía Computarizada de Emisión de Fotón ÚnicoRESUMEN
Cerebral perfusion was investigated in three patients with agyria-pachygyria by using 99mTc-HMPAO SPECT in order to study the distribution of blood flow. Diffuse cortical hypoperfusion was found in all three infants. The visual cortex was not identifiable in two of the cases. The basal ganglia and cerebellum were prominent by their normal high activity, while tracer uptake was very low in the thalamus. The possible role of improper development of interneuronal connections and abnormal vascular pattern in background of the perfusion defect is discussed.
Asunto(s)
Corteza Cerebral/anomalías , Circulación Cerebrovascular/fisiología , Corteza Cerebral/anatomía & histología , Corteza Cerebral/irrigación sanguínea , Preescolar , Electroencefalografía , Femenino , Humanos , Recién Nacido , Imagen por Resonancia Magnética , Masculino , Compuestos de Organotecnecio , Oximas , Exametazima de Tecnecio Tc 99m , Tomografía Computarizada de Emisión de Fotón Único , Tomografía Computarizada por Rayos XRESUMEN
Fourteen children with spastic hemiplegia of various etiology: cerebral palsy (seven cases, five with porencephalic cyst); stroke with small deep infarcts (two); hemiconvulsion-hemiplegia-epilepsy syndrome (three); traumatic brain injury (two), were investigated by 99mTc-HMPAO SPECT. Localized and remote perfusion abnormalities were studied. Hypoperfusion corresponding to CT abnormalities was found in each group, but the perfusion deficit extended beyond the boundaries of anatomical defects, most prominently in cases with widespread unilateral epileptic discharges. Ipsilateral cerebellar diaschisis was observed in patients with early cerebral insult (who had porencephalic cyst of pre- or perinatal onset) and crossed cerebellar diaschisis was noted in a patient who sustained traumatic brain injury at a later age. Diaschisis in the overlying cortex, thalamus and basal ganglia was noticed in several cases. Although clinical symptoms or signs could not be unequivocally attributed either to the size of the perfusion defects beyond the boundaries of lesions shown by CT or to the diaschisis, the findings may contribute to reveal age-related abnormal perfusion patterns.
Asunto(s)
Encéfalo/irrigación sanguínea , Hemiplejía/diagnóstico por imagen , Tomografía Computarizada de Emisión de Fotón Único , Tomografía Computarizada por Rayos X , Edad de Inicio , Encéfalo/patología , Daño Encefálico Crónico/complicaciones , Estudios de Casos y Controles , Circulación Cerebrovascular , Niño , Preescolar , Epilepsia/etiología , Femenino , Hemiplejía/etiología , Humanos , Lactante , Masculino , Estudios RetrospectivosRESUMEN
Regional cerebral blood flow was investigated in an 8-year-old boy with adrenoleukodystrophy by single photon emission computed tomography. The use of 99mTc-hexamethylpropylene amine oxime revealed markedly reduced blood flow in the occipital, parietal, and temporal cortical gray matter, in addition to the anticipated reduction in white matter. The area with a decreased blood flow was more extensive than that detected by x-ray computed tomography.
Asunto(s)
Adrenoleucodistrofia/diagnóstico por imagen , Encéfalo/diagnóstico por imagen , Circulación Cerebrovascular , Compuestos de Organotecnecio , Oximas , Tomografía Computarizada de Emisión de Fotón Único , Adrenoleucodistrofia/complicaciones , Adrenoleucodistrofia/fisiopatología , Niño , Trastornos del Conocimiento/etiología , Trastornos del Conocimiento/fisiopatología , Humanos , Masculino , Exametazima de Tecnecio Tc 99m , Tomografía Computarizada por Rayos XRESUMEN
The short-term effect (2 weeks) of angiotensin-converting enzyme inhibitor (enalapril) on renal hemodynamics and urinary albumin excretion was investigated in eleven normotensive patients with incipient diabetic nephropathy (IDN). Six patients had had elevated baseline glomerular filtration rate (GFR) and each responded to enalapril with a decline in the GFR, from a mean of 160.7 to 134 ml/min/1.73 m2, (p less than 0.05). Their respective filtration fraction values also decreased from a mean of 27.8 to 23.8% (p less than 0.01). Such renal hemodynamic change was accompanied by a decrease in urinary albumin excretion (33 to 19 micrograms/min, p less than 0.05). The remaining 5 patients had displayed normal baseline GFR (mean, 109.6 ml/min/1.73 m2), responded to enalapril with minimal change in the GFR (115.2 ml/min/1.73 m2) and showed no significant improvement in their microalbuminuria. It is concluded that enalapril is effective in lowering glomerular filtration pressure and ameliorating microalbuminuria in the normotensive patient with IDN only when the baseline GFR is elevated.
Asunto(s)
Albuminuria/tratamiento farmacológico , Nefropatías Diabéticas/tratamiento farmacológico , Enalapril/uso terapéutico , Presión Sanguínea , Diabetes Mellitus Tipo 1/complicaciones , Femenino , Tasa de Filtración Glomerular/efectos de los fármacos , Humanos , Masculino , Circulación Renal/efectos de los fármacos , Factores de TiempoRESUMEN
The authors report, probably for the first time, a successful pre-operative localization of 7 mm intrathyroidal parathyroid adenoma which was successfully removed by using parathyroid imaging using a dual tracer (T1-201 and Tc-99m) and subtraction technique.
Asunto(s)
Adenoma/diagnóstico por imagen , Neoplasias de las Paratiroides/diagnóstico por imagen , Neoplasias de la Tiroides/diagnóstico por imagen , Humanos , Masculino , Persona de Mediana Edad , Cintigrafía , Pertecnetato de Sodio Tc 99m , Técnica de Sustracción , Talio , Radioisótopos de TalioRESUMEN
An 18-year-old male was evaluated for recurrent attacks of right abdominal pain and intermittent jaundice caused by hydatid cysts of the liver. The case illustrates the value of dynamic functional information provided by Tc-99m-HIDA imaging over noninvasive modalities that demonstrate structural changes, such as ultrasound, computed tomography, and tin colloid liver imaging.
Asunto(s)
Colestasis Intrahepática/etiología , Equinococosis Hepática/complicaciones , Compuestos de Tecnecio , Compuestos de Estaño , Adolescente , Colangiopancreatografia Retrógrada Endoscópica , Colestasis Intrahepática/diagnóstico , Equinococosis Hepática/diagnóstico , Humanos , Iminoácidos , Masculino , Compuestos Organometálicos , Tecnecio , Lidofenina de Tecnecio Tc 99m , Estaño , Tomografía Computarizada por Rayos X , UltrasonografíaRESUMEN
Brucellosis is an endemic disease in the Middle East. Its incidence in Kuwait has increased during the last 5 years. Bone and joint involvement causes major symptoms and disabilities. Radionuclide bone scans are more sensitive than radiographs in detecting these lesions. The aim of this study is to describe the abnormal patterns detected on bone imaging in acute and chronic brucellosis. Tc-99m MDP bone scans of 56 patients with established diagnosis of brucellosis (19 acute and 37 chronic) were retrospectively analyzed. Bone scans were positive in 8 of 19 patients (42%) with acute brucellosis and in 28 of 37 patients (76%) with chronic brucellosis. Six patterns were observed: involvement of an entire body of one or more vertebrae, especially at the lumbar region (50%); sacroiliitis (41%); focal high uptake at the junction of the upper and lateral margins of the vertebra "Caries sign" (27%); multiple costovertebral joints and costochondral junction involvement (19%); involvement of large joints similar to degenerative osteoarthritis (25%); and focal involvement of long bone (11%).
Asunto(s)
Brucelosis/diagnóstico por imagen , Enfermedad Aguda , Adulto , Dolor de Espalda/diagnóstico por imagen , Enfermedades Óseas/diagnóstico por imagen , Enfermedad Crónica , Femenino , Humanos , Artropatías/diagnóstico por imagen , Masculino , Persona de Mediana Edad , Cintigrafía , Medronato de Tecnecio Tc 99mRESUMEN
Acute pancreatitis is a serious surgical problem with a high incidence of mortality. Both ultrasound and X-ray CT have problems in identifying the extent and severity of the disease and the response to therapy. 67Ga-citrate has been used in 21 patients with clinically diagnosed acute pancreatitis: 9 patients had X-ray CT and 15 had US examination. Gallium scans were more sensitive than X-ray CT and US in detecting the extent and severity of acute pancreatitis. In addition, gallium was helpful to monitor the response to therapy when the scan was repeated at various intervals in three patients. A subtraction technique using 99mTc-tin colloid and 67Ga-citrate was helpful to mask the liver uptake of gallium and clearly identify the extent of acute pancreatitis.
Asunto(s)
Radioisótopos de Galio , Pancreatitis/diagnóstico por imagen , Enfermedad Aguda , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , CintigrafíaRESUMEN
A case of hematobilia causing upper gastrointestinal bleeding is demonstrated by Tc-99m DTPA. The advantages of Tc-99m DTPA over Tc-99m sulfur colloid and RBCs are discussed.