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QTc interval in patients with schizophrenia receiving antipsychotic treatment as monotherapy or polypharmacy

Published online by Cambridge University Press:  29 June 2017

Anja Elliott ,
Thibault Johan Mørk ,
Mikkel Højlund ,
Thomas Christensen ,
Rasmus Jeppesen ,
Nikolaj Madsen ,
Anne Grethe Viuff ,
Peter Hjorth ,
Jens Cosedis Nielsen  and
Povl Munk-Jørgensen
Anja Elliott*
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark Psychiatric Research Academy, Psychiatric Hospital and University of Southern Denmark, Odense, Denmark
Thibault Johan Mørk
Affiliation:
Department of Cardiology, Aarhus University Hospital–Skejby, Skejby, Denmark
Mikkel Højlund
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark Psychiatric Research Academy, Psychiatric Hospital and University of Southern Denmark, Odense, Denmark
Thomas Christensen
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark
Rasmus Jeppesen
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark
Nikolaj Madsen
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark
Anne Grethe Viuff
Affiliation:
Department of Psychiatry, Regional Psychiatry West, Herning, Denmark
Peter Hjorth
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark Regional Psychiatry Services, Randers, Denmark Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
Jens Cosedis Nielsen
Affiliation:
Department of Cardiology, Aarhus University Hospital–Skejby, Skejby, Denmark
Povl Munk-Jørgensen
Affiliation:
Aarhus University Hospital, Department of Affective Disorders, Risskov, Denmark Psychiatric Research Academy, Psychiatric Hospital and University of Southern Denmark, Odense, Denmark
*
*Address correspondence to: Anja Elliott, Department of Affective Disorders, Aarhus University Hospital, Risskov, Denmark, and University of Southern Denmark, Skovagervej 2, 8240 Odense, Denmark. (Email: anjaelliott@hotmail.com)
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Abstract

Objective

Antipsychotics are associated with a polymorphic ventricular tachycardia, torsades de pointes, which, in the worst case, can lead to sudden cardiac death. The QT interval corrected for heart rate (QTc) is used as a clinical proxy for torsades de pointes. The QTc interval can be prolonged by antipsychotic monotherapy, but it is unknown if the QTc interval is prolonged further with antipsychotic polypharmaceutical treatment. Therefore, this study investigated the associations between QTc interval and antipsychotic monotherapy and antipsychotic polypharmaceutical treatment in schizophrenia, and measured the frequency of QTc prolongation among patients.

Methods

We carried out an observational cohort study of unselected patients with schizophrenia visiting outpatient facilities in the region of Central Jutland, Denmark. Patients were enrolled from January of 2013 to June of 2015, with follow-up until June of 2015. Data were collected from clinical interviews and clinical case records.

Results

Electrocardiograms were available for 65 patients, and 6% had QTc prolongation. We observed no difference in average QTc interval for the whole sample of patients receiving no antipsychotics, antipsychotic monotherapy, or antipsychotic polypharmaceutical treatment (p=0.29). However, women presented with a longer QTc interval when receiving polypharmacy than when receiving monotherapy (p=0.01). A limitation of this study was its small sample size.

Conclusions

We recommend an increased focus on monitoring the QTc interval in women with schizophrenia receiving antipsychotics as polypharmacy.

Keywords

QTcpolypharmacyantipsychoticsschizophreniasex difference
Type
Original Research
Information
CNS Spectrums , Volume 23 , Issue 4 , August 2018 , pp. 278 - 283
Copyright
© Cambridge University Press 2017 

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