pulmonary embolism: a harmful association? Case series and review of the literature.Objective: Risperidone is an atypical antipsychotic drug used to treat a number of psychiatric diseases, such as schizophrenia, schizoaffective and bipolar disorders and irritability in children with autism. Moreover, it is also often administered for short-term treatment of persistent aggression in people with moderate-to-severe Alzheimer's dementia. A possible association between risperidone and venous thromboembolism (VTE) has been described. We intended to verify the dimension of the problem in our hospital setting. Methods: We considered all consecutive patients hospitalised in our Internal Medicine Department from January 2004 to December 2010, who were treated with risperidone and presented pulmonary embolism (PE). Results: Four cases of patients, apparently free from the well-known major risk factors for VTE (i.e. cancer, prolonged immobilisation, acute cardiac and respiratory failure, infections), who presented PE associated with risperidone therapy, were reported in details.
Significant OutcomesOur study showed:• Pulmonary embolism is not a negligible finding in a cohort of patients admitted to a medical department (0.66%). • A possible association between risperidone and pulmonary embolism has been shown (26/494), especially in elderly patients. • Four patients, apparently free from all the major risk factors, developed a pulmonary embolism, although they had all a favourable outcome.
Limitations• As a result of a small series of clinical cases, any definite conclusion cannot be drawn. Further investigation on larger scale cohorts of patients will be needed to confirm this possible, and potentially harmful, association.