Plasma noradrenaline response to electroconvulsive therapy in depressive illness

Abstract

BackgroundAbnormalities of catecholaminergic function have been hypothesised to cause depressive illness. Plasma noradrenaline can be used as a marker of central noradrenergic activity. It is of interest to examine the change in resting plasma noradrenaline in patients with depressive illness over a course of electroconvulsive therapy (ECT) and relate this to their clinical state.MethodPatients referred for ECT who suffered from DSM – III – R major depressive disorder or dysthymia were recruited. Blood samples were taken before and after each treatment, during a course of ECT, to measure plasma noradrenaline and Cortisol. Clinical ratings were carried out weekly during the course of ECT.ResultsPlasma noradrenaline fell significantly in those patients with melancholic/psychotic depressions but increased in those with non-melancholic depressive illness. There was a strong trend indicating that a fall in plasma noradrenaline was associated with improvement in depression ratings in the melancholic/psychotic patients only.ConclusionsElectroconvlusive therapy decreases plasma noradrenaline in melancholic/psychotic depressive illness and this shows a trend associated with clinical improvement.