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J Vasc Surg. 2015 Nov;62(5):1125-33.e2. doi: 10.1016/j.jvs.2015.06.051. Epub 2015 Jul 14.

Comparison of a Vascular Study Group of New England risk prediction model with established risk prediction models of in-hospital mortality after elective abdominal aortic aneurysm repair.

Author information

1
Division of Vascular and Endovascular Surgery, Boston University School of Medicine, Boston, Mass. Electronic address: mohammad.eslami@bmc.org.
2
Department of Biostatistics, Boston School of Public Health, Boston, Mass.
3
Division of Vascular and Endovascular Surgery, Boston University School of Medicine, Boston, Mass.

Abstract

BACKGROUND:

A certain number of deaths may result from elective abdominal aortic aneurysm (AAA) repair due to inherent risks of operation; however, no agreement exists about which predictive model for in-hospital mortality is most accurate in predicting these events. This study developed a risk prediction model using Vascular Study Group of New England (VSGNE) data and compared it with established models.

METHODS:

VSGNE data (2003-2013) were queried for patients undergoing elective AAA repair by open or endovascular techniques. Clinical variables and known predictors of mortality were included in a full prediction model. Backward elimination with α = .2 was used to construct a parsimonious model. This VSGNE model was compared with established models-Medicare, Glasgow Aneurysm Score (GAS), and Vascular Governance North West (VGNW)-based on the scope of VSGNE data collection. Model fit was compared with the Vuong test. Model discrimination was compared in equally sized risk-group VSGNE terciles.

RESULTS:

The overall mortality rate for 4431 elective AAA patients was 1.4%. The discriminating ability of the VSGNE model was high (C statistic = 0.822) and corrected slightly to 0.779 after internal validation. Vuong tests yielded significant overall fit difference favoring the VSGNE model over the Medicare (C statistic = 0.769), VGNW (C statistic = 0.767), and GAS (C statistic = 0.685) models. The VGNW and Medicare models performed better than GAS in predicting mortality among risk-group terciles.

CONCLUSIONS:

The VSGNE risk prediction model is best at forecasting mortality among this patient population. The Medicare and VGNW models showed good discrimination.

PMID:
26187291
DOI:
10.1016/j.jvs.2015.06.051
[Indexed for MEDLINE]
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