Changes of subtests of Wechsler Memory Scale and cognitive function in subjects with subclinical hypothyroidism following treatment with levothyroxine.
Arch Med Sci
; 8(6): 1096-101, 2012 Dec 20.
Article
in En
| MEDLINE
| ID: mdl-23319987
ABSTRACT
INTRODUCTION:
Subclinical hypothyroidism has been reported to be associated with disturbed cognitive function. In this study, changes of subtests of the Wechsler Memory Scale and memory quotient were investigated in subjects with subclinical hypothyroidism following treatment with levothyroxine. The aim of the study was a randomized double blind placebo-controlled clinical trial. MATERIAL ANDMETHODS:
Sixty subjects (51 females and 9 males) with subclinical hypothyroidism were enrolled. Memory quotient was evaluated at the beginning of the study and three months after enrollment, using Wechsler's memory test. Subclinical hypothyroidism was defined as serum TSH level between 4.5 mU/l and 10 mU/l in the presence of normal free-T4 (0.8-2 ng/dl) and positive anti-TPO-Ab. The intervention and control groups received levothyroxine and placebo respectively for 3 months. Re-evaluation was done using the Wechsler Memory Scale at the end of the study.RESULTS:
The mean age was 34 ±10 years, mean TSH level was 8.25 ±3.64 muIU/l. Memory quotient was similar in both groups at the beginning of the study 105.70 ±2.1 in intervention group vs. 105.87 ±2.1 in control group (p = 0.89). At the end of the study, the memory quotient rose by 9.3 points in the intervention group and by 3.23 in the controls (p = 0.002). Analysis of the scores of Wechsler Memory subtests in the intervention group indicated significant improvement of mental control (p = 0.002), logical memory (p < 0.001), associate learning (p = 0.014), age corrected score (p = 0.002), and memory quotient (p < 0.001).CONCLUSIONS:
This study showed the efficacy of levothyroxine for cognitive function of subjects with subclinical hypothyroidism.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Clinical_trials
Language:
En
Journal:
Arch Med Sci
Year:
2012
Document type:
Article
Affiliation country:
Iran