Objective: To examine, in a post hoc analysis of an antidepressant treatment trial, correlates of irritability and aggression after stroke and changes in irritability scores associated with antidepressant treatment.
Design: Aggressive patients (n=23) were compared with nonaggressive patients (n=69) on numerous measures of psychopathology, poststroke impairment, and neuroimaging findings.
Setting: All patients were hospitalized at the time of the initial evaluation for acute stroke or for rehabilitation therapy.
Participants: Ninety-two patients from the Iowa City Stroke Study were classified as aggressive or nonaggressive, based on symptoms elicited by the Present State Examination (PSE) and from family or caretaker reports.
Intervention: All patients were randomized to receive nortriptyline, fluoxetine, or placebo using a double-blind methodology.
Main Outcome Measure: The change in aggression score as elicited by the PSE at the beginning and the end of a 12-week treatment trial.
Results: Twenty-five percent (23/92) of patients reported irritability or aggression. Irritable and aggressive patients had higher total PSE scores, Hamilton Depression Rating Scale scores, Hamilton Anxiety Rating Scale (HAMA) scores, and lower Mini-Mental State Examination scores. They also had lesions that were more proximal to the frontal pole. Stepwise regression analysis showed that HAMA scores and proximity of lesion to the frontal pole were significant independent predictors of irritability. Among irritable and aggressive patients with depression who responded to antidepressants, there was a significantly greater reduction in irritability after treatment, compared with patients whose depression did not lessen with treatment.
Conclusions: Several factors, such as severity of impairment, other psychopathology, and neurobiologic factors, appear to contribute to irritable and aggressive behavior in stroke patients. If depression accompanies aggression, the results of this small study suggest that successful treatment of depression may reduce aggressive behavior.
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