July - September 2006, Volume 2, Issue 3

Dobrescu R, Badiu C, Iamandescu IB, Coculescu M

Decreased short term memory, attention and impaired learning due to chronic hypercortisolism in Cushing patients

Acta Endo (Buc) 2006, 2 (3): 307-322
doi: 10.4183/aeb.2006.307

Aims: Prolonged exposure to a glucocorticoid excess leads to cognitive impairment in experimental animals as well as humans. The present study tries to identify the cognitive deficits in patients with Cushing’s syndrome and to evaluate the possible residual deficits in patients after treatment. Materials and methods: 19 patients (women) with a history of chronic endogenous hypercortisolemia were investigated for etiology using clinical and biochemical criteria. Cognitive functions were evaluated using a battery of psychometric tests: the Rey Auditory Verbal Learning Test (RAVLT), the BCR2 battery for general intellectual potential and the Prague test, for divided attention and resistance to psychic fatigue. The patients were divided into two groups (before surgical treatment– Cushing and after surgical treatment – postCushing) without differences in age or duration of studies between groups (p = ns). The controls were considered to belong to the general population for which the psychometric tests were standardized. Results: Both groups showed an altered pattern of incremental learning - scores below standard in the last two trials of the RAVLT (one sample t test, one tailed, p<0.05), and the total score (p<0.05 for PostCushing, p=0.07 for Cushing); both had very low total scores in the battery for intellectual potential. The PostCushing scores were significantly better than those of the Cushing group for only one nonverbal test (complex perceptual analysis), p<0.02. There appears to be no significant effect of cortisol exposure on distributive attention; there is however an alteration in the resistance to psychic fatigue. Daily average cortisol exposure was positively correlated with the number of errors in learning for both groups (r=0.65, p=0.058 for Cushing; r=0.85, p<0.005 for PostCushing) Duration of illness was negatively correlated with the total learning score in the PostCushing group (r=-0.68, p<0.05). For the Cushing group there was a strong negative correlation between the duration of illness, general performance (r=-0.81, p<0.05) and verbal scores (r=-0.77, p<0.07).

Keywords: Cushing's syndrome, cognition, neuropsychological testing

Correspondence: Mihail Coculescu, Endocrinology Department, “Carol Davila” University of Medicine and Pharmacy, 8 Bd. Eroilor Sanitari, Bucharest, Romania, Tel: + 4021 319.87.18, e-mail: m.coculescu@uni-davila.ro