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Updated: Aug 5, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
Published on: February 12, 2014
Difficult access problems
1Hospital of the University of Pennsylvania, Philadelphia, USA.
Abstract:
We have described numerous alternatives for establishing central venous access in challenging patients. Using these techniques has proven successful in our experience in essentially all patients, although occasionally initial efforts fail and repeated attempts by alternate routes are required. The keys to eventual success appear to be good basic surgical skills, a strong working relationship between surgeon and interventional radiologist, and perhaps most important, perseverance in the face of frustration.
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