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Gepubliceerd in: Quality of Life Research 5/2016

01-05-2016

Health-related quality of life in two randomized controlled trials of phentermine/topiramate for obesity: What mediates improvement?

Auteurs: Ronette L. Kolotkin, Kishore M. Gadde, Craig A. Peterson, Ross D. Crosby

Gepubliceerd in: Quality of Life Research | Uitgave 5/2016

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Abstract

Purpose

Phentermine/topiramate combination therapy resulted in significant weight loss and improvements in cardiometabolic risk factors in patients with obesity/overweight in two published 56-week randomized, placebo-controlled trials (EQUIP and CONQUER). The purpose of the current study was to examine whether phentermine/topiramate is also associated with greater improvements in health-related quality of life (HRQOL) and whether HRQOL improvements are solely attributable to weight reduction.

Methods

Patients in EQUIP (n = 751) had a body mass index (BMI) ≥ 35 with no obesity-related comorbidity. Patients in CONQUER (n = 1623) had a BMI ≥ 27 and ≤ 45 and at least two obesity-related comorbid conditions. HRQOL was assessed with Impact of Weight on Quality of Life-Lite (IWQOL-Lite) and Medical Outcomes Study Short Form (SF-36) (CONQUER only).

Results

Significant improvements in both obesity-specific and physical HRQOL were observed at 56 weeks in both trials (p < .0001). In EQUIP, BMI reduction fully mediated improvements in IWQOL-Lite total score (p < .0001). In CONQUER, both BMI reduction (all p values <.0001) and change in depressive symptoms (all p values <.025) were significant mediators of improved IWQOL-Lite total score and SF-36 Physical Component Summary score. Gender, psychiatric history, and baseline triglycerides moderated these relationships.

Conclusions

Both trials demonstrated that treatment with phentermine/topiramate improved HRQOL compared with placebo. Although reduction in BMI accounted for the majority of improvements in obesity-specific and physical HRQOL, decrease in depressive symptoms was also a significant mediator. Results highlight the predominance of weight reduction as a key factor in improving HRQOL in obesity.

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Metagegevens
Titel
Health-related quality of life in two randomized controlled trials of phentermine/topiramate for obesity: What mediates improvement?
Auteurs
Ronette L. Kolotkin
Kishore M. Gadde
Craig A. Peterson
Ross D. Crosby
Publicatiedatum
01-05-2016
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 5/2016
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-015-1153-x