Keith A A Fox1, Gabriele Accetta2, Karen S Pieper3, Jean-Pierre Bassand4,5, A John Camm6,7, David A Fitzmaurice8, Gloria Kayani2, Ajay K Kakkar4,9. 1. Centre for Cardiovascular Science, University of Edinburgh, Queen's Medical Research Institute, 47 Little France Crescent, Edinburgh EH16?4TJ, UK. 2. Thrombosis Research Institute, Emmanuel Kaye Building, Manresa Road, London SW3?6LR, UK. 3. Duke Clinical Research Institute, 2400 Pratt St, Durham, NC 27705, USA. 4. Thrombosis Research Institute, Emmanuel Kaye Building, Manresa Road, London SW3 6LR, UK. 5. University of Besançon, 1 Rue Claude Goudimel, Besançon 25000, France. 6. Molecular and Clinical Sciences Research Institute, Cardiology Clinical Academic Group, St George's, University of London, Cranmer Terrace, London SW17 0RE, UK. 7. Imperial College London, Kensington, London SW7 2AZ, UK. 8. Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK. 9. University of London, Gower St, Kings Cross, London WC1E 6BT, UK.
Abstract
Aims: 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 and 18 months (such that the total time of follow-up was 24 months; data collection December 2009 and October 2010). In the prospectively enrolled cohort, patients with newly diagnosed AF (≤6 weeks after diagnosis) were recruited between March 2010 and October 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 2.51-3.67] vs. 4.05 [95% CI 3.53-4.63]; P = 0.016). Conclusion: 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: http://www.clinicaltrials.gov. Unique identifier for GARFIELD-AF (NCT01090362). Published on behalf of the European Society of Cardiology. All rights reserved.
Aims: 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 and 18 months (such that the total time of follow-up was 24 months; data collection December 2009 and October 2010). In the prospectively enrolled cohort, patients with newly diagnosed AF (≤6 weeks after diagnosis) were recruited between March 2010 and October 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 2.51-3.67] vs. 4.05 [95% CI 3.53-4.63]; P = 0.016). Conclusion: 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: http://www.clinicaltrials.gov. Unique identifier for GARFIELD-AF (NCT01090362). Published on behalf of the European Society of Cardiology. All rights reserved.
Authors: Jean-Pierre Bassand; Saverio Virdone; Marc Badoz; Freek W A Verheugt; A John Camm; Frank Cools; Keith A A Fox; Samuel Z Goldhaber; Shinya Goto; Sylvia Haas; Werner Hacke; Gloria Kayani; Frank Misselwitz; Karen S Pieper; Alexander G G Turpie; Martin van Eickels; Ajay K Kakkar Journal: Blood Adv Date: 2021-02-23
Authors: Jan Beyer-Westendorf; A John Camm; Keith A A Fox; Jean-Yves Le Heuzey; Sylvia Haas; Alexander G G Turpie; Saverio Virdone; Ajay K Kakkar Journal: Thromb J Date: 2019-04-25