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Thyroid associated
ophthalmopathy (TAO)
Terwee et al., Amsterdam, The Netherlands, assessed the test-retest
reliability of the GO-QOL which is a disease-specific quality of life questionnaire
for patients with TAO. The GO-QOL is a short, self-administered questionnaire,
including aspects of visual functioning and psychological consequences
of TAO, indicated by TAO patients as being important. In the study 89 consecutive
patients (mean age 50 yrs, 66 women) with varying degrees of TAO were included.
The questionnaire was repeated after 2 weeks. Validity of the questionnaire
was assessed by correlating the results with two generic quality of life
questionnaires and the questionnaire was subdivided in two subscales, one
related to visual functioning and the other to appearance. Mean scores
for visual functioning was 64.3 and for appearance 61.1, indicating that
patients were on average impaired on two thirds of all items. The results
also indicated that the test-retest reliability was good. The authors conclude
that the self- administered questionnaire is a promising tool for self-assessment
of visual and psychosocial consequences of patients with TAO. (Comment:
This questionnaire is also important in evaluation of treatment results
of TAO.)
T4 treatment and the heart
Pigliaru et al., Cagliari, Italy, assessed cardiac function by echocardiographic,
ergometabolic, and clinical (Symptom Rating Scale-Klein) criteria in 19
patients receiving long term L-T4 at a fixed TSH-suppressive
daily dose of 1.5-1.8 µg/kg, such that serum TSH was below 0.02 µU/ml.
FT3 levels in these subjects were between 2.0-3.7 pg/ml (normal
range 2.8-5.6 pg/ml). Results were compared to healthy controls matched
for age and sex. Interventricular septal thickness, left ventricular posterior
wall diastolic thickness, left ventricular end-diastolic dimension, left
ventricular mass index, were all increased in T4 treated subjects
versus controls, whereas maximal oxygen consumption per kg bodyweight and
an aerobic threshold were significantly decreased in T4 treated
subjects. In 4 subjects the T4 dose was reduced to a minimal
TSH-suppressive amount and echocardiographic data were accumulated 6 months
later. It appeared that the abnormal findings were diminished or had disappeared.
(Comment: There is still controversy in the literature with regard to cardiac
effects of TSH-suppressive doses of T4. This study suggests
that, if T4 is titrated to a minimal TSH-suppressive dose, cardiac
effects are less or even absent. The results of this study, however, are
preliminary in that only 4 patients were tested being on the titrated T4
dose.)
Chernobyl accident
Vermiglio et al., Messina, Italy and Tula, Russia, measured serum
antibodies against thyroglobulin (TgAb) and to thyroperoxidase (TPOAb),
FT3, FT4, and TSH levels in children and adolescents
from a moderately iodine deficient area, exposed to a moderate dose of
radioactivity by the Chernobyl accident (1.5 Ci/km2 of Caesium), n = 143,
and in a group living in the same iodine deficient area without radioactive
exposure, n = 40. Goiter prevalence was the same in both groups, 42 vs
45% respectively. Also FT3, FT4, and TSH levels or prevalence of
hypothyroidism (13.9 vs 12.5% respectively) were not different.
However, a 4- fold increase in prevalence of one or both antibodies
was present in the exposed group as compared to the non-exposed
group: 19.5 vs 5% respectively. (Comment: This report confirms
others that also show increased thyroid autoimmunity in subjects in
contaminated areas by the Chernobyl accident.)
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