Functional impairment in patients with major depressive disorder: the 2-year PERFORM study
Authors Hammer-Helmich L, Haro JM, Jönsson B, Tanguy Melac A, Di Nicola S, Chollet J, Milea D, Rive B, Saragoussi D
Received 12 July 2017
Accepted for publication 27 October 2017
Published 9 January 2018 Volume 2018:14 Pages 239—249
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Colin Mak
Peer reviewer comments 2
Editor who approved publication: Dr Roger Pinder
Lene Hammer-Helmich,1 Josep Maria Haro,2 Bengt Jönsson,3 Audrey Tanguy Melac,4 Sylvie Di Nicola,5 Julien Chollet,6 Dominique Milea,7 Benoît Rive,8 Delphine Saragoussi4
1Real World Evidence and Epidemiology, H Lundbeck A/S, Valby, Denmark; 2Research and Teaching Unit, Parc Sanitari Sant Joan de Deu, CIBERSAM, University of Barcelona, Barcelona, Spain; 3Department of Economics, Stockholm School of Economics, Stockholm, Sweden; 4Real-World Evidence and Epidemiology, Lundbeck SAS, Issy-les-Moulineaux, 5Biostatistics, Inferential, Paris, 6Clinical Operations, Lundbeck SAS, Issy-les-Moulineaux, France; 7Health Economics and Epidemiology, Lundbeck Singapore Pte. Ltd, Singapore, Singapore; 8Global Analytics, Lundbeck SAS, Issy-les-Moulineaux, France
Background: The Prospective Epidemiological Research on Functioning Outcomes Related to Major depressive disorder (PERFORM) study describes the course of depressive symptoms, perceived cognitive symptoms, and functional impairment over 2 years in outpatients with major depressive disorder (MDD) and investigates the patient-related factors associated with functional impairment.
Methods: This was a 2-year observational study in 1,159 outpatients with MDD aged 18–65 years who were either initiating antidepressant monotherapy or undergoing their first switch of antidepressant. Functional impairment was assessed by the Sheehan Disability Scale and the Work Productivity and Activity Impairment questionnaire. Patients assessed depression severity using the nine-item Patient Health Questionnaire and severity of perceived cognitive symptoms using the five-item Perceived Deficit Questionnaire. To investigate which patient-related factors were associated with functional impairment, univariate analyses of variance were performed to identify relevant factors that were then included in multivariate analyses of covariance at baseline, month 2, months 6 and 12 combined, and months 18 and 24 combined.
Results: The greatest improvement in depressive symptoms, perceived cognitive symptoms, and functional impairment was seen immediately (within 2 months) following initiation or switch of antidepressant therapy, followed by more gradual improvement and long-term stabilization. Improvement in perceived cognitive symptoms was less marked than improvement in depressive symptoms during the acute treatment phase. Functional impairment in patients with MDD was not only associated with severity of depressive symptoms but also independently associated with severity of perceived cognitive symptoms when adjusted for depression severity throughout the 2 years of follow-up.
Conclusion: These findings highlight the burden of functional impairment in MDD and the importance of recognizing and managing cognitive symptoms in daily practice.
Keywords: major depressive disorder, functioning, functional impairment, depression, cognition
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