External Validation of the Swedvasc Registry: A First-time Individual Cross-matching with the Unique Personal Identity Number

Troëng, Thomas; Malmstedt, Jonas; Björck, Martin

doi:10.1016/j.ejvs.2008.08.017

Cited by 123 publications

(105 citation statements)

References 22 publications

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“…Nonetheless, previous validation of the Swedvasc registry has shown excellent external and internal validity, 5 and data quality has been improved by merging the databases, which all use the same personal identity code to identify patients, as well as by reviewing individual case records. As has been commented on previously, not all patients gave their consent for retrospective review of medical records.…”

Section: Discussionmentioning

confidence: 99%

“…5,6 A detailed analysis of the stroke register data quality has shown that the concordance between hospital inpatient medical records versus data recorded in the stroke register is high (≥95%) for stroke subtype and clinical parameters. The vascular and stroke registries complement each other with regard to pre-, peri-, and postoperative data.…”

Section: Study Datamentioning

confidence: 99%

“…Previous external validation for CEA has been 93.4% in the Swedvasc registry after comparing vascular registry data for CEA/CAS with the Swedish Hospital Discharge Register data and the National Population Registry (for mortality) by matching every individual patient using a unique 10-digit personal identity code. 4,5 All citizens and permanent residents in Sweden have a 10-digit personal identity code used to identify the patient in the Swedvasc registry, the Stroke registry, and the Population registry. Mortality data in the Swedvasc register are fully accurate because the register is continuously cross-checked against the National Population Register.…”

Section: Study Datamentioning

confidence: 99%

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Urgent Carotid Surgery and Stenting May Be Safe After Systemic Thrombolysis for Stroke

Koraen-Smith

Troëng

Björck

et al. 2014

Stroke

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Background and Purpose-Early carotid surgery or stenting after thrombolytic treatment for stroke has become more common during recent years. It is unclear whether this carries an increased risk of postoperative complications and death. The aim of this nationwide population-based study was, therefore, to investigate the safety of urgently performed carotid procedures in patients treated with thrombolysis for stroke. Methods-Using the national Vascular and Stroke registries, we identified 3998 patients who had undergone carotid endarterectomy or carotid artery stenting for symptomatic carotid stenosis between May 2008 and December 2012. Among these, 2% (79 of 3998) had undergone previous thrombolysis for stroke. We conducted a retrospective review of registry data and individual case records with regard to postoperative complications, including surgical-site bleeding, stroke, and death. The outcome was compared with the results for the remaining patient cohort (3919 of 3998) undergoing carotid surgery and stenting during the study period. Results-The median time between thrombolysis and the carotid procedure was 10 days. Seventy-one patients underwent carotid endarterectomy, and 6 patients underwent carotid artery stenting. The 30-day death and stroke rate for the thrombolysis cohort was 2.5% (2 of 79), and for the whole cohort, it was 3.8% (139 of

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Section: Discussionmentioning

confidence: 99%

Section: Study Datamentioning

confidence: 99%

Section: Study Datamentioning

confidence: 99%

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Urgent Carotid Surgery and Stenting May Be Safe After Systemic Thrombolysis for Stroke

Koraen-Smith

Troëng

Björck

et al. 2014

Stroke

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“…The external validity of the registry is high and covers Ͼ93% of all CEAs performed in Sweden. 20 Because the data are prospectively gathered from a heterogeneous unselected population in everyday clinical practice, they are therefore well suited to monitor the effects of changes in guidelines on the timing of CEA. However, it is important to note that our study is not randomized and there may be differences between the subgroups that we did not identify.…”

Section: Discussionmentioning

confidence: 99%

“…These results have shown 93.7% to 100% completeness. 20,21 Several articles have also studied the external and internal validation of Swedvasc showing high accuracy regarding stroke and death within 30 days postoperatively. [22][23][24] We obtained data for patients who underwent intervention for symptomatic carotid stenosis in Sweden between May 12, 2008, and May 31, 2011, and were recorded in Swedvasc (nϭ2763).…”

Section: Study Populationmentioning

confidence: 99%

Very Urgent Carotid Endarterectomy Confers Increased Procedural Risk

Strömberg

Gélin

Österberg

et al. 2012

Stroke

165

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Background and Purpose— Current Swedish guidelines recommend that carotid endarterectomy should be performed within 14 days of a qualifying neurological event, but it is not clear if very urgent surgery after an event is associated with increased perioperative risk. The aim of this study was to determine how the time between the event and carotid endarterectomy affects the procedural risk of mortality and stroke. Methods— We prospectively analyzed data on all patients who underwent carotid endarterectomies for symptomatic carotid stenosis between May 12, 2008, and May 31, 2011, with records in the Swedish Vascular Registry (Swedvasc). Patients were divided according to time between the qualifying event and surgery (0–2 days, 3–7 days, 8–14 days, 15–180 days). Stroke rate and mortality at 30 days postsurgery were determined. Results— We analyzed data for 2596 patients and found that the combined mortality and stroke rate for patients treated 0 to 2 days after qualifying event was 11.5% (17 of 148) versus 3.6% (29 of 804), 4.0% (27 of 677), and 5.4% (52 of 967) for the groups treated at 3 to 7 days, 8 to 14 days, and 15 to 180 days, respectively. In a multivariate analysis, time was an independent risk factor for perioperative complications: patients treated at 0 to 2 days had a relative OR of 4.24 (CI, 2.07–8.70; P <0.001) compared with the reference 3- to 7-day group. Conclusions— In this study of patients treated for symptomatic carotid disease, it was safe to perform surgery as early as Day 3 after a qualifying neurological event in contrast to patients treated within 0 to 2 days, which has a significantly increased perioperative risk.

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Comparison of long-term mortality after ruptured abdominal aortic aneurysm in England and Sweden

Karthikesalingam

Wanhainen

Holt

et al. 2016

Journal of British Surgery

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External Validation of the Swedvasc Registry: A First-time Individual Cross-matching with the Unique Personal Identity Number

Abstract: The external and internal validity of the Swedvasc registry allows to confidently assess volumes of, and mortality after, vascular surgery in Sweden.

Cited by 123 publications

References 22 publications

Urgent Carotid Surgery and Stenting May Be Safe After Systemic Thrombolysis for Stroke

Urgent Carotid Surgery and Stenting May Be Safe After Systemic Thrombolysis for Stroke

Very Urgent Carotid Endarterectomy Confers Increased Procedural Risk

Comparison of long-term mortality after ruptured abdominal aortic aneurysm in England and Sweden

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