Figure 1. Study sample. ICD, implantable cardioverter-defibrillator; NCDR, National Cardiovascular Data Registry; QRS, QRS interval duration.
Figure 2. Percentage of primary prevention patients who received a discretionary dual-chamber implantable cardioverter-defibrillator (ICD) by hospital.
Figure 3. Percentage of primary prevention patients who received a discretionary dual-chamber implantable cardioverter-defibrillator (ICD) by physician.
Figure 4. Proportion of patients receiving a dual-chamber implantable cardioverter-defibrillator by hospital referral region.
Matlock DD, Peterson PN, Wang Y, Curtis JP, Reynolds MR, Varosy PD, Masoudi FA. Variation in Use of Dual-Chamber Implantable Cardioverter-DefibrillatorsResults From the National Cardiovascular Data Registry. Arch Intern Med. 2012;172(8):634-641. doi:10.1001/archinternmed.2012.394
Author Affiliations: Department of Medicine, University of Colorado Denver School of Medicine, Aurora (Drs Matlock, Peterson, Varosy, and Masoudi); Colorado Cardiovascular Outcomes Research Group, Denver (Drs Matlock, Peterson, Varosy, and Masoudi); Institute for Health Research, Kaiser Permanente Colorado, Denver (Drs Matlock, Peterson, and Masoudi); Department of Medicine, Denver Health Medical Center, Denver (Dr Peterson); Department of Internal Medicine, Yale University, New Haven, Connecticut (Mr Wang and Dr Curtis); Department of Medicine, Division of Cardiology, Beth Israel Deaconess Medical Center and the Boston VA Healthcare System, Boston, Massachusetts (Dr Reynolds); and The Medical Service, Section of Cardiology, Veterans Affairs Eastern Colorado Health Care System, Denver (Dr Varosy).