Cardiovascular risks and their long-term clinical outcome in patients with subclinical Cushing's syndrome.

Although subclinical Cushing's syndrome has been commonly experienced, details of the clinical outcome and its indication for adrenalectomy have yet to be established. In the present study, we investigated the prevalence of cardiovascular risks, their clinical outcome during long-term follow up before and after adrenalectomy in 20 patients with subclinical Cushing's syndrome. We also correlated the hypercortisolism and age with the cardiovascular risks and the clinical outcome. The prevalence of hypertension, impaired glucose metabolism, dyslipidemia, and obesity was 45%, 65%, 65%, and 25%, respectively. In the non-operated group (n = 12), six patients (50%) showed deterioration of at least one of the cardiovascular risks. Four patients showed an increase of at least one risk, while none of the patients showed a decrease in the number of risks. One patient developed overt Cushing's syndrome. In the operated group (n = 10) including two operated patients of the non-operated group, eight patients (80%) showed an improvement of at least one of the cardiovascular risks after surgery and five patients (50%) showed a decrease of at least one risk. The prognosis in terms of the changes of the cardiovascular risks was significantly better in the operated group than in the non-operated group (p<0.001). Neither the hypercortisolism nor age correlated to the presence and the clinical outcome of the cardiovascular risks. The present study clearly demonstrated probability of deterioration during the clinical course and improvement after adrenal surgery in patients with subclinical Cushing's syndrome. Careful follow-up of the cardiovascular risks is therefore warranted. Adrenalectomy could be a treatment of choice despite the hypercortisolism and age of the patients, especially when the cardiovascular risks show signs of deterioration.