Fox, KAA; Accetta, G; Pieper, KS; Bassand, J-P; Camm, AJ; Fitzmaurice, DA; Kayani, G; Kakkar, AK; GARFIELD-AF Investigators
(2018)
Why Are Outcomes Different for Registry Patients Enrolled Prospectively and Retrospectively? Insights from the Global Anticoagulant Registry in the FIELD-Atrial Fibrillation (GARFIELD-AF).
Eur Heart J Qual Care Clin Outcomes, 4 (1).
pp. 27-35.
ISSN 2058-1742
https://doi.org/10.1093/ehjqcco/qcx030
SGUL Authors: Camm, Alan John
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Abstract
Background: Retrospective and prospective observational studies are designed to reflect real-world evidence on clinical practice, but can yield conflicting results. The GARFIELD-AF Registry includes both methods of enrolment and allows analysis of differences in patient characteristics and outcomes that may result. Methods and Results: Patients with atrial fibrillation (AF) and ≥1 risk factor for stroke at diagnosis of AF were recruited either retrospectively (n = 5069) or prospectively (n = 5501) from 19 countries and then followed prospectively. The retrospectively enrolled cohort comprised patients with established AF (for a least 6, and up to 24 months before enrolment), who were identified retrospectively (and baseline and partial follow-up data were collected from the emedical records) and then followed prospectively between 0-18 months (such that the total time of follow-up was 24 months; data collection Dec-2009 and Oct-2010). In the prospectively enrolled cohort, patients with newly diagnosed AF (≤6 weeks after diagnosis) were recruited between Mar-2010 and Oct-2011 and were followed for 24 months after enrolment. Differences between the cohorts were observed in clinical characteristics, including type of AF, stroke prevention strategies, and event rates. More patients in the retrospectively identified cohort received vitamin K antagonists (62.1% vs. 53.2%) and fewer received non-vitamin K oral anticoagulants (1.8% vs . 4.2%). All-cause mortality rates per 100 person-years during the prospective follow-up (starting the first study visit up to 1 year) were significantly lower in the retrospective than prospectively identified cohort (3.04 [95% CI 2.51 to 3.67] vs . 4.05 [95% CI 3.53 to 4.63]; p = 0.016). Conclusions: Interpretations of data from registries that aim to evaluate the characteristics and outcomes of patients with AF must take account of differences in registry design and the impact of recall bias and survivorship bias that is incurred with retrospective enrolment. Clinical Trial Registration: - URL: http://www.clinicaltrials.gov . Unique identifier for GARFIELD-AF (NCT01090362).
Item Type: | Article | ||||||||
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Additional Information: | This is a pre-copyedited, author-produced version of an article accepted for publication in European Heart Journal - Quality of Care and Clinical Outcomes following peer review. The version of record Keith A A Fox, Gabriele Accetta, Karen S Pieper, Jean-Pierre Bassand, A John Camm, David A Fitzmaurice, Gloria Kayani, Ajay K Kakkar, ; Why are outcomes different for registry patients enrolled prospectively and retrospectively? Insights from the global anticoagulant registry in the FIELD-Atrial Fibrillation (GARFIELD-AF), European Heart Journal - Quality of Care and Clinical Outcomes, Volume 4, Issue 1, 1 January 2018, Pages 27–35 is available online at: https://doi.org/10.1093/ehjqcco/qcx030 | ||||||||
Keywords: | Anticoagulation, Atrial Fibrillation, Prospective, Registries, Retrospective | ||||||||
SGUL Research Institute / Research Centre: | Academic Structure > Molecular and Clinical Sciences Research Institute (MCS) Academic Structure > Molecular and Clinical Sciences Research Institute (MCS) > Cardiac (INCCCA) |
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Journal or Publication Title: | Eur Heart J Qual Care Clin Outcomes | ||||||||
ISSN: | 2058-1742 | ||||||||
Language: | eng | ||||||||
Dates: |
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Publisher License: | Publisher's own licence | ||||||||
PubMed ID: | 28950344 | ||||||||
Go to PubMed abstract | |||||||||
URI: | https://openaccess.sgul.ac.uk/id/eprint/109177 | ||||||||
Publisher's version: | https://doi.org/10.1093/ehjqcco/qcx030 |
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