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Biomedical subjects

G F Fueger

Publications and source records attributed to G F Fueger.

At least 19 recordsLinked to original sources
PubMed1991

[Normal values for free thyroxine, free triiodothyronine, reverse triiodothyronine, thyrotropin, thyroglobulin and thyroxine-binding globulin in umbilical cord blood of healthy mature newborn infants].

The venous cord blood levels of free thyroxine (fT4), free triiodothyronine (fT3), reverse triiodothyronine (rT3), thyrotropin (TSH), thyroglobulin (TG) and thyroxine binding globulin (TBG) were studied in 56 mature and healthy newborns. Newborns with a gestational age less than 37 or more than 42 weeks, a delivery by forceps or cesarian section, a birth-weight less than 2500 g, a pH-value of the cord-artery blood less than 7.15, an Apgar-value after 1 minute less than 7 were excluded from the study. All mothers were non-smokers. The values of fT4 were 18.66 +/- 4.18 pmol/L, of fT3 were 1.59 +/- 0.75 pmol/L, of fT3 were 2152 +/- 666 pg/ml, of TSH were 7.83 +/- 4.49 mU/ml, of TG were 44.61 +/- 23.84 ng/ml, and of TBG were 25.61 +/- 5.42 micrograms/ml. A weak negative correlation was found between the TG-value and the pH-value of the cord-artery blood (r = -0.27, y = 191.55 - 22.82.x, p less than 0.05), and between the fT4 values and the gestational age (r = -0.34, y = 67.53-1.22.x, p = 0.01). The rT3-values were positively correlated to the gestational age (r = 0.29, y = -4571 + 167.x, p less than 0.03).

Female↗
PubMed1990

Diminished response to furosemide in I-123 Hippuran renal studies of renovascular hypertension caused by unilateral renal artery stenosis.

Dynamic I-123 Hippuran renal studies to measure furosemide response (FR) were performed in three groups of patients: 1) 57 patients with renovascular hypertension due to a poststenotic, ischemic kidney; 2) 23 patients with essential hypertension; and 3) 50 nonhypertensive patients with healthy kidneys (control group). FR was observed as renal parenchymal tracer washout within 10 minutes after the injection of 40 mg of furosemide. The retention index (RI) took into consideration the renal parenchymal tracer content before and 10 minutes after furosemide injection. In the control group, the FR was greater than 50% and the RI was less than 20. Patients with essential hypertension revealed no differences in the amounts of FR and RI compared with the control group. In renovascular hypertension, the FR was diminished and the RI was raised significantly. The values of FR and RI showed a good correlation to the degree of the renal artery stenosis before and after percutaneous transluminal angioplasty. It is concluded that the stimulation of diuresis with furosemide and its quantification represent an important additional step in the evaluation of dynamic I-123 Hippuran studies to detect renal ischemia.

Furosemide↗
PubMed1989

Abdominal metastases of an ovarian cancer demonstrated on bone imaging.

Tc-99m HMDP uptake by abdominal metastases of an ovarian cancer was seen on a bone image. The findings were confirmed by computed tomography and by biopsy at surgery. The psammoma bodies throughout the tumor tissue appeared to be the substrate of this unusual extraosseous tracer uptake.

Abdominal Neoplasms↗
PubMed1989

Quantitative static and dynamic renal scintigraphy with diuresis stimulation in renovascular hypertension.

The results of computer-assisted static and dynamic renal scintigraphy in 57 patients with renovascular hypertension (RVH) and 23 patients with essential hypertension (EH) are presented. The following parameters were quantified: renal size (RS), count density (CD), relative unilateral renal clearance (RRC), mean parenchymal transit time (PTT), difference of time-to-peak of activity (tmaxd) to stenosed minus non-stenosed side, effect of frusemide (FE) and renal parenchymal radionuclide retention (RI). Among 57 stenosed renal arteries we detected 54 (true-positive cases) and missed three (false-negative cases); among 23 patients with EH and no significant haemodynamic renal artery stenosis, we found 21 cases correctly negative and two patients falsely positive. These data yielded a sensitivity of 95% and a specificity of 92%. The quantification of renal radionuclide studies in renal artery stenoses minimizes false-positive results and increases their specificity. This study shows that, because of its sensitivity, quantitative renal scintigraphy reliably allows the assessment of the functional haemodynamic effects of a renovascular lesion (significant stenosis) in the diagnostic work-up and during follow-up after surgical reconstruction or percutaneous transluminal angioplasty (PTA). The evaluation of renal function is in general greatly supported by the quantitative parameters, yet particularly after medication with converting enzyme inhibitors and after intervention.

Diuresis↗
PubMed1989

[Indications for MIBG scintigraphy in the diagnosis of neuroblastoma].

The significance and indications of MIBG scintigraphy are critically assessed. The results are compared with the results of whole-body bone scintigraphy, computed tomography (CT) and magnetic resonance tomography (MRT), and are related to values of catecholamine metabolites in 24-h urines. In our patients (10 histologically proven cases) MIBG scintigraphy turned out to be most useful in tumor follow-up. In contrast, the significance was much lower in primary tumor diagnosis and tumor staging as the exact primary diagnosis was established by other means such as CT, MRT, MDP whole-body scan, urine chemistry and bone marrow biopsy in all cases. MIBG scintigraphy in diagnostic imaging of neuroblastoma is an additive diagnostic tool and is called for in (1) tumour follow-up (progress, recurrencies, metastases); (2) primary diagnosis if the primary tumour has not been localized by means of CT or MRT; and (3) tumour staging to differentiate stage IV disease from lower stages as long as stage IV disease has not been established by bone-marrow biopsy or MDP whole-body scan.

3-Iodobenzylguanidine↗
PubMed1988

[Aircraft noise: changes in biochemical parameters].

The effect of stress caused by aircraft noise was studied on 14 female and 11 male volunteers, who were of a age ranging from 21 to 42 years and of a mean age of 25 years. The volunteers were exposed to an aircraft simulator that stimulated the low level flight of an air force plane and produced a maximum noise level of 105 dB(A) for 3 sec. in a short time. Before and immediately after the exposure, the concentration of ACTH was measured by means of a radioimmunoassay. The ACTH is a hormone, responsible for initiating a chain reaction that is characteristic for a stress reaction. In 100% of the cases the concentration of this hormone increased. It reached a pathological level in 28% of the cases. The effect on the lipid metabolism was expressed by an increase of total cholesterol and a decrease of the triglycerides in the serum. A slight increase in blood sugar which, together with the free fatty acids, is relatively quickly reduced to energy, could be determined. The aircraft noise did not influence the activity of the liver transaminases in any way. A short-term exposure to aircraft noise is able to stimulate a stress reaction, whereby, the determination of the ACTH offers valuable informations.

Adrenocorticotropic Hormone↗
PubMed1988

[Functional diagnosis of biliary endoprostheses using hepatobiliary sequence scintigraphy].

In 11 patients with biliary endoprosthesis, hepatobiliary scintigraphy with dimethyliminodiacetic acid (HIDA) was performed 16 times because of an increase in the serum bilirubin level. For the demonstration of dysfunction of the endoprosthesis, this method proved to have the same sensitivity as transhepatic cholangiography, which was performed as control examination. Therefore, hepatobiliary scintigraphy, a noninvasive and well-tolerated examination, can be recommended as a primary diagnostic tool in addition to ultrasonography for assessment of the drainage function of the biliary endoprosthesis.

Aged↗
PubMed1987

[Value of cholescintigraphy in the differential diagnosis of direct hyperbilirubinemia in infancy].

Cholescintigraphy using 99mTc-diethyl-, 99mTc-diisopropyl-, 99mTc-iodo-diethyl- and 99mTc-bro-motrimethyl-IDA was performed in 22 newborns and infants with direct hyperbilirubinaemia. Retrospective evaluation of 99mTc-diethyl- and 99mTc-diisopropyl-IDA (n = 18) showed an efficiency of 66% in the differentiation between extrahepatic biliary atresia and neonatal intrahepatic diseases if the hepatocyte-clearance index and transit time were taken into consideration; the sensitivity of detecting extrahepatic biliary atresia was 100%. Cholestyramine treatment (n = 9) did not increase the efficiency of the test. Efficiency was markedly reduced when the serum direct bilirubin level was above 5.5 mg/dl (94 mumol/l). The gall bladder was not visualized in 13 out of 18 examinations. The prospective and retrospective analysis of 99mTc-iodo-diethyl- and 99mTc-bromo-trimethyl-IDA revealed intrahepatic disease in all 6 infants with serum values up to 12.6 mg/dl (216 mumol/l) direct bilirubin; the gall bladder was not visualized in 4 out of 7 examinations.

Biliary Atresia↗
PubMed1987

[Liver diseases in children and their relatives with homozygous and heterozygous alpha 1-antitrypsin deficiency].

Over a 6-year period 26 infants and children with homozygous (2 Z and 6 ZZ) or heterozygous alpha 1-antitrypsin deficiency (12 MZ, 6 MS) were observed prospectively and their families investigated. 7 of 8 homozygous patients had neonatal hepatitis, whereby 3 of these showed maximum transferase activities during the 5th to 9th months of life. At the age of 7 years 2 of these patients were clinically normal, but only one patient had normal transferases. One patient had cirrhosis with portal hypertension at the age of 16 years 6 months; her nephew showed hypersplenism. Family studies revealed a further 5 relatives of phenotype Z, 16 of phenotype MZ, 3 of phenotype SZ and 1 of phenotype MS; 6 of these had slightly elevated serum transferase activities. 6 patients of phenotype MZ and 2 patients of phenotype MS had neonatal hepatitis but generally with a much better prognosis than in homozygous patients. The other heterozygous patients (6 MZ and 4 MS) had a variety of additional factors determining the disease and the prognosis. Family studies showed a further 7 family members of phenotype MZ, and 2 of phenotype MS; 2 of these had slightly elevated transferase activities, 3 parents had hereditary hyperbilirubinaemia.

Adolescent↗
PubMed1987

[Results of bone marrow scintigraphy in hematological diseases].

Bone marrow scintigraphy was performed in 40 patients with haematological disorders (lymphomas, multiple myeloma, myeloid leukaemia, panmyelopathy and others). Routine skeletal scintigraphy was available for comparison in 18 patients. In agreement with the literature it became evident that marrow scintigraphy can show infiltrations of the bone marrow in haematological disorders earlier than skeletal scintigraphy. Hot lesions were caused by reactive proliferation of the bone marrow such as may occur with acute inflammatory joint diseases, osteomyelitis, fracture healing or other entities. Marrow imaging demonstrated reliably the actual distribution of the functioning bone marrow, a characteristic that is important for diagnosis and staging, especially in myeloproliferative diseases.

Bone Marrow↗
PubMed1987

A computer controlled automated dispensor for the eluting, calibrating and dispensing of 99Tcm-pertechnetate.

This paper describes an automated 99Tcm-Dispensor, a computer controlled device for the programmed, automated elution of 99Tcm-sodium pertechnetate, its calibration, metered delivery and dilution. The elution can be programmed up to 7 days in advance. The total radioactivity of the eluate is assayed by a semiconductor counter integrated in the shielding of the pertechnetate reservoir. The volume of eluate actually available for dispensing is measured by capacitance and is monitored continuously. The specific concentration is calculated from total activity and volume, and is corrected for decay prior to each delivery. All activity bearing sections are shielded by lead-antimony covers specified to attenuate the radiation from generators up to 2 Ci 99Mo/99Tcm. The labelling vials are inserted into the dispensing chamber within a shielding vessel manually. The sodium pertechnetate solution is dispensed prior to the optional additional delivery of normal saline. The Tc-Dispensor maintains sterility, guards against accidental radioactive contamination, and is suited to reduce the radiation burden of personnel. All operations are recorded by the computer enabling the print-out of protocols. We found the Tc-Dispensor safe, precise and accurate.

Calibration↗
PubMed1987

[Dosimetry and dose schedule of radioiodine therapy with 131 iodine].

In 131-J treatment as in other forms of internal radiotherapy using biologically distributed radionuclides it is important to differentiate between projected and obtained internal radiation doses which may differ considerably because of a change in the kinetics during and because of the irradiation by radioiodine. The clinical result (remission, recurrence, ablation, hypothyroidism) as well as possibly necessary repetition of the treatment depend upon the obtained rather than the projected internal radiation dose. Dosimetry of the internal radiation dose to the thyroid considers the emitted energy of the radionuclide, the absorbed fractions, the mass of the thyroid tissue, maximum thyroid uptake, and the mean residence time in the target tissue (derived from the effective elimination half time). A monoexponential time course is observed in only about one half of the patients, whereas the other one half displays biexponential or nonlinear curves which can not be established reliably within 48 hours. While sonographic volumetry and thyroid uptake can be performed prior to iodine therapy, the true effective elimination halftime of the radioiodine can be measured only following its administration. About 97% of the internal radiation dose to the normal 20-g-thyroid gland is caused by the nonpenetrating emission. In goitres the contribution by the penetrating emissions increases proportional to the cubic root of the square of the mass. A dose of 5 mCi will cause in the 80-g-thyroid with 80% uptake internal radiation doses differing by a factor of 2 or more (i. e. approx. 1500 rad or less in one case or about 3000 rad or more in another case) depending upon the mean intrathyroidal residence time. The internal radiation doses to the gonads and the total body are dimensionally smaller than the thyroid dose by about one thousand. Radioiodine therapy using 125-I has been abandoned.

Graves Disease↗
PubMed1986

[Biological effects and risks of accidental radionuclide uptake].

This review presents the actual state of knowledge about medical dangers of a radioactive fall-out. Concepts for the estimation of accidental incorporation, as well as effects and risks that are known to occur after incorporation of radionuclides are discussed. Special attention is paid to the following topics: effect of radioiodine on the thyroid gland, effect of radio-cesium on whole body burden, alpha-emitting particles (plutonium) with deposition in the airways, association of osteotrope radionuclides (strontium) with malignomas of the skeleton and finally prophylaxis with iodine to prevent damage of the thyroid.

Accidents↗