Health-related quality of life consequences of implantable cardioverter defibrillators: results from MADIT II.
BACKGROUND
Implantable cardioverter defibrillators (ICDs) improve survival and extend lives of patients with severe heart disease.


OBJECTIVE
We sought to evaluate the impact of ICDs on health-related quality of life (HRQOL) during the first 3 years after implantation.


METHODS
A total of 1089 patients from the Multicenter Automatic Defibrillator Implantation Trial II (MADIT II) were randomized to an ICD or medical treatment only.


METHODS
Health Utility Index (HUI3) at baseline, 3, 12, 24, and 36 months following randomization; survival data.


METHODS
We constructed mean profiles of HRQOL for living patients, estimated overall quality-adjusted life years (QALYs), separately by treatment arm, and calculated cumulative QALY gains/losses as the difference between the areas under the treatment specific HRQOL profiles. Multivariate fixed effect regression models were developed to impute the missing HRQOL data using baseline patient characteristics (age, gender, treatment, HUI3 score, diabetes, diuretics use, and NYHA class). Bootstrapped standard errors were calculated for the estimated differences in HRQOL gains/losses between treatment arms. Similarly, we performed subgroup analyses (by gender, age, and baseline NYHA class, blood urine nitrogen, ejection fraction, and QRS).


RESULTS
There were no differences in QALYs loss for living patients by treatment group (-0.037, P = 0.64) or in overall QALYs loss by treatment group (0.043, P = 0.37) over 3 years. In subgroup analysis, female subjects demonstrated a trend towards greater survival benefit (0.298, P = 0.07) and overall QALYs (0.261, P = 0.14).


CONCLUSIONS
Adverse effects of the ICD on HRQOL together with lower HRQOL among survivors may offset the 3-year survival benefits of ICDs.
Noyes
Katia
K
Department of Community and Preventive Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York 14620, USA. katia_noyes@urmc.rochester.edu
Corona
Ethan
E
Zwanziger
Jack
J
Hall
W Jackson
WJ
Zhao
Hongwei
H
Wang
Hongkun
H
Moss
Arthur J
AJ
Dick
Andrew W
AW
D000367:Age Factors; D000368:Aged; D003625:Data Collection; D017147:Defibrillators, Implantable; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D019057:Quality-Adjusted Life Years; D012737:Sex Factors; D016019:Survival Analysis; D016896:Treatment Outcome; D014481:United States / Q000453:epidemiology