Biomedical subjects
Publications and source records attributed to M A Muros de Fuentes.
Three cases of intracranial 201Tl uptake, reported as positive tumour activity in patients with a final diagnosis of abscess, are described. 201Tl has been proposed as a useful oncotropic radiotracer in the diagnosis of brain tumour activity. These cases suggest a note of caution in the interpretation of 201Tl brain images in the differential diagnosis of an intracranial expanding mass.
Twenty patients with the diagnosis of pheochromocytoma were studied from January 1990 to January 1998. Nineteen patients had a pathologic investigation performed. The mean age of patients was 49 +/- 16 years (range: 24-71 years), 8 males and 12 females. Nine cases corresponded to adrenal and eleven to extra-adrenal (paragangliomas) pheochromocytomas. The anatomic location was similar in both adrenal glands and for paragangliomas the cervical location predominated. The most consistent clinical finding in our patients was maintained arterial hypertension, followed by headache, palpitations and flushing. Biochemically, an increase in urine catecholamine levels or their metabolites was found in 82.2%. The clonidine test was very useful, particularly for cases where biochemical results were discrepant. CT, NMR and gammagraphy with 123I-MIBG have a high sensitivity for locating pheochromocytomas. NMR and gammagraphy with 111In-pentetreotide located cases in which CT or 123I-MIBG were negative. Preoperative treatment with adrenergic alpha-blockers allowed to surgery with no arterial tension complications. Only one patient with multiple abdominal paragangliomas relapsed. No differences regarding clinical manifestations, biochemical parameters or imaging studies were found between pheochromocytomas and paragangliomas, except their location.
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The aim of this study is to evaluate gastric emptying change in patients with gastroesophageal reflux (GER). To this purpose, 36 patients with GER diagnosis and 18 control subjects have been studied. GER diagnosis was achieved by means of endoscopy, biopsy and 24 h continuous pH monitoring. Gastric emptying studies were performed on a two day basis, similar labelling meals were provided to patients and control subjects. Those consisted in a one-egg omelette, chicken (110 gr) and orange juice (200 ml). On first day liquid phase was labelled with 99mTc-diethylenetriamine pentaacetic acid (99mTc-DTPA), and on second day, the solid phase was labelled with 99mTc-sulfur colloid in the omelette (Labelling efficiency was 85.3 +/- 3.2%). The studies were carried out by imaging static anterior and posterior views every 20 minutes for a total of 180 minutes. Images were quantified obtaining solid and liquid gastric emptying curves. No statistical significative difference between patients and control subjects gastric emptying results were found. We can conclude that gastric emptying is not a main factor in the pathogenesis of gastroesophageal reflux.
We have reviewed the legislation about the quality control of dose calibrator. The importance of verifying the correct work of these instruments, is fundamental in daily practice of radiopharmacy and nuclear medicine. The Spanish legislation establishes to include these controls as part of the quality control of radiopharmaceuticals, and the program of quality assurance in nuclear medicine. We have reviewed guides and protocols from international eminent organizations, summarizing the recommended tests and periodicity of them.