# THE JOURNAL OF CARDIOVASCULAR SURGERY

## A Journal on Cardiac, Vascular and Thoracic Surgery

Indexed/Abstracted in: BIOSIS Previews, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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ORIGINAL ARTICLES  VASCULAR SECTION

# The Journal of Cardiovascular Surgery 2016 February;57(1):66-71

language: English

#### How to calculate the main aortic graft-diameter for a chimney-graft

Tilo KÖLBEL 1, Sebastian W. CARPENTER 1, Anusch TARAZ 2, Martin TARAZ 2, Axel LARENA-AVELLANEDA 1, Eike S. DEBUS 1

1 Department of Vascular Medicine, University Heart Center, University Hospital Eppendorf, Hamburg, Germany; 2 Department of Mathematics, Technical University Munich, Garching, Germany

BACKGROUND: The aim of this paper was to present a mathematical model to calculate the required main aortic graft-diameter for parallel chimney-grafts.
METHODS: Geometric approximation model, developed to allow for a standardized calculation of the main aortic graft-diameter determined by the aortic diameter and the diameter of the chimney-graft.
RESULTS: We propose a mathematical formula using circular segments of the aorta and the chimney-graft and provide a table with recommended main aortic graft-diameters for single chimney-grafts of 6 and 8 mm.
CONCLUSION: Geometric approximation can be used to calculate the required main aortic graft-diameter. For parallel running chimney-grafts a significant degree of oversizing is necessary to allow the main aortic body to surround the chimney and to prevent the occurrence of gutters, which may cause type-1 endoleaks.

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