Document Detail

201Tl scintigraphy does not allow visualization of the thyroid in euthyroid and hyperthyroid patients treated with amiodarone.
MedLine Citation:
PMID:  9259521     Owner:  NLM     Status:  MEDLINE    
A retrospective study was performed to evaluate the usefulness of thallium scintigraphy for visualization of thyroid morphology and function. Moreover, applying absolute quantitation, we wished to confirm the qualitatively reduced 99Tc(m) uptake reported by Wiersinga et al. in both euthyroid and hyperthyroid patients treated with amiodarone. Over a period of 2 years (1995-96), 10 patients (group A; 2 females, 8 males, mean age 68.6 years, range 61-74 years) receiving amiodarone treatment for cardiac arrhythmias for at least 4 months were referred for exploration of either hyperthyroidism (n = 4) or for exclusion of parathyroid adenoma (n = 6). During the same period, 17 patients (group B; 10 females, 7 males, mean age 62 years, range 19-91 years) referred for Tc-Tl subtraction scintigraphy, and in whom follow-up revealed no thyroid or parathyroid pathology, were used as controls. In all patients, thyroid status was assessed by thyroid function tests. 201Tl and 99Tc(m) uptake was calculated as a percentage of the injected dose, taking account of net injected counts and background and isotope decay correction. Original images were scored using a 2-point scoring system (0 = poor, 1 = fair or good). Uptake of both 99Tc(m) and 201Tl was significantly reduced in group A (99Tc[m]: 0.16 +/- 0.21%; 201Tl: 0.30 +/- 0.21%; mean +/- S.D.) compared to group B (99Tc[m]: 1.58 +/- 1.07%; 201Tl: 0.72 +/- 0.37%) (P < 0.005). The mean relative reduction in 99Tc(m) uptake was more pronounced (90% decrease) than that of 201Tl (58% decrease). In group A, the 99Tc(m) and 201Tl image quality was poor in 10 of 10 and 8 of 10 patients respectively. In group B, the 99Tc(m) and 201Tl image quality was poor in 3 of 17 and 4 of 17 patients respectively. The decreased uptake of 201Tl may reflect the inhibitory effect of iodides on adenyl cyclase and its stimulation by TSH. In conclusion, the data presented confirm the qualitatively reduced pertechnetate uptake reported by Wiersinga et al. Furthermore, 201Tl uptake by the thyroid in euthyroid or hyperthyroid patients treated with amiodarone is also reduced. Although quantitatively less pronounced, it does not allow proper visualization of the thyroid.
C van de Wiele; K Osmanagaoglu; M Monsieurs; K van Laere; J M Kaufman; R A Dierckx
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Nuclear medicine communications     Volume:  18     ISSN:  0143-3636     ISO Abbreviation:  Nucl Med Commun     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-09-30     Completed Date:  1997-09-30     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8201017     Medline TA:  Nucl Med Commun     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  513-6     Citation Subset:  IM    
Division of Nuclear Medicine, University Hospital Gent, Belgium.
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MeSH Terms
Aged, 80 and over
Amiodarone / therapeutic use*
Anti-Arrhythmia Agents / therapeutic use*
Arrhythmias, Cardiac / drug therapy
Hyperthyroidism / radionuclide imaging*
Middle Aged
Reference Values
Retrospective Studies
Sodium Pertechnetate Tc 99m / diagnostic use*,  pharmacokinetics
Thallium Radioisotopes / diagnostic use*,  pharmacokinetics
Thyroid Gland / radionuclide imaging*
Reg. No./Substance:
0/Anti-Arrhythmia Agents; 0/Thallium Radioisotopes; 1951-25-3/Amiodarone; 23288-60-0/Sodium Pertechnetate Tc 99m

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