Alpha-1 Antitrypsin Augmentation Therapy Improves Survival in Severely Deficient Patients with Predicted FEV1 Between 10% and 60%: A Retrospective Analysis of the NHLBI Alpha-1 Antitrypsin Deficiency Registry
Authors Rahaghi FF, Monk R, Ramakrishnan V, Beiko T, Strange C
Received 30 July 2020
Accepted for publication 26 October 2020
Published 3 December 2020 Volume 2020:15 Pages 3193—3199
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 4
Editor who approved publication: Dr Richard Russell
Franck F Rahaghi,1 Richard Monk,2 Viswanathan Ramakrishnan,3 Tatsiana Beiko,2 Charlie Strange2
1Department of Pulmonary and Critical Care, Cleveland Clinic Florida, Weston, FL, USA; 2Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Medical University of South Carolina, Charleston, SC, USA; 3Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA
Correspondence: Franck F Rahaghi
Department of Pulmonary and Critical Care, Cleveland Clinic Florida, Weston, FL, USA
Tel +1 954 659 5450
Fax +1 954 6595451
Purpose: The extent of the survival benefit of augmentation therapy for alpha-1 antitrypsin deficiency (AATD) in individuals with advanced COPD is difficult to define. We performed a retrospective analysis using all available data from the observational registry of individuals with severe deficiency of alpha-1 antitrypsin (AAT) conducted by the NHLBI investigators.
Patients and Methods: Individuals (N=1129) with severe deficiency of AAT were evaluated for mortality using all data sources and stratified by 10% increments of baseline forced expiratory volume in 1 second (FEV1) percent predicted and by augmentation therapy status (ever receiving versus never receiving). Kaplan–Meier survival curves were constructed for each of the deciles comparing survival in treated vs non-treated groups. A multivariable model was performed to define the correlates of survival in individuals with FEV1 < 30% predicted.
Results: Amongst all subjects, augmentation was associated with improved survival (p< 0.0001). Among the individuals ever receiving augmentation therapy, survival was better than for those not receiving augmentation at all 10% increments of FEV1% predicted from 10% to 60% (P values < 0.05 in all deciles). In subgroups of participants with hyperinflation defined as residual volume (RV)> 120% predicted and in subgroups of participants with reduced diffusing capacity for carbon monoxide (DLCO) < 70% predicted, there was significantly better survival for those ever receiving augmentation therapy than for those who never received augmentation (p< 0.001). A multivariable analysis showed that mortality benefit is influenced by age, DLCO % predicted, and augmentation therapy.
Conclusion: There is a survival benefit from augmentation therapy in AATD between FEV1 values in the 10– 60% predicted range. Screening and treatment of AATD patients should therefore not be limited by the severity of illness as defined by FEV1.
Keywords: alpha-1 antitrypsin deficiency, COPD, mortality, augmentation therapy, FEV1, survival
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