Cardiac Issues Raised by an Examination of the Antipsychotic Prescribing Practices in the Elderly of St. James's Hospital (SJH), Dublin

Abstract

Background

Antipsychotic medication use may be associated with prolongation of the QTc interval, increasing the risk of potentially fatal arrhythmias [1]. This is particularly pertinent in the elderly due to comorbid cardiovascular disease and polypharmacy. Attention to the ECG and co-prescribed medications is essential to minimise cardiac risk when prescribing antipsychotics.

Methods

On 23rd February 2016 all inpatients aged over 65 who were prescribed antipsychotic medications were identified as part of a hospital-wide survey. Data was collected from medical and electronic patient notes and medication kardexes.

Results

Complete data was obtained for 36 patients aged over 65 who were newly-prescribed an antipsychotic or had their antipsychotic changed. Of these, 39%(n = 13) had a cardiac history. One quarter did not have an ECG in the 12 months preceding antipsychotic initiation. Of the 28 patients with an ECG, 57% (n = 16) had a QTc > 450ms before starting antipsychotic treatment. Only 11% (n = 4) had an ECG within 24 hours of starting the antipsychotic. The average change of the QTc interval in those with a repeat ECG was 30msecs. 42% (n = 15) were co-prescribed another QTc-prolonging medication.

Conclusion

Current monitoring of QTc interval in an elderly population newly prescribed antipsychotic medications is inadequate and a cause for significant safety concerns. Education and clear guidance is warranted to improve safety and minimise risk in this population.

Disclosure of interest

The authors have not supplied their declaration of competing interest.