Medication errors in Parkinson's disease inpatients in the Basque Country.

INTRODUCTION: Parkinson's disease (PD) medication errors, including both missing dopaminergic drug doses and antidopaminergic usage, have been suggested as risk factors for prolonged hospital stays. The objective of this study was to evaluate the prevalence of such errors in PD patients admitted to public acute-care hospitals in the Basque Country over a two year period and their association with clinically relevant adverse health outcomes, such as length of hospital stay and mortality.

METHODS: All PD patients admitted to any of the 11 public acute-care hospitals in the Basque Country in 2011-2012 were included. Medication errors involved incorrect timing or the complete omission of administration for dopaminergic drugs, and the administration of centrally acting antidopaminergics. A logistic regression and a competing risk analysis were applied to verify whether those errors affected intrahospital mortality and length of stay.

RESULTS: The study included 1628 patients admitted 2546 times. Medication errors, affecting almost one third of admissions and half of patients, were associated with higher mortality: inappropriately omitted dopaminergic drug doses OR = 1.92 CI 95% (1.34-2.76); inappropriate antiemetic administration OR = 2.15 CI 95% (1.36-3.39); and inappropriate antipsychotic administration OR = 1.91 CI 95% (1.33-1.73). Inappropriately omitted doses and both inappropriate antipsychotic and antiemetic administration were associated with a significant 4-day increase in median hospital stay.

CONCLUSION: Medication errors (missing dopaminergic drug doses and centrally acting antidopaminergic use) are not only associated with increased length of hospital stays in PD patients, but also with a higher mortality rate.