The purpose of this study is to evaluate if the use of antidepressant medication in depressed patients with implantable cardioverter defibrillator reduces the number of ICD's shocks as it improves depressive affect.

episodes of arrhythmia remain present even after icd implantation, this is specially true in depressed patients. it is hypothesized that improving mood state by means of an antidepressant drug . namely mirtazapine. could be responsible of alleviating the number of appropriate shocks delivered by the cardioverter. this could be due to a direct effect of the drug itself or an indirect effect of improving anxious and depressive affect. the mood and anxiety state are measured with the HADS scale

Inclusion Criteria:

• cardioverter implanted patients
• depression
• anxiety

Exclusion Criteria:

• heart failure
• other diseases reducing physical fitness