RESULTS.Technical failures (6.3%) were caused by the inability to perform an arm venogram in 22 patients or to catheterize the brachial vein in 41 patients.

• 结果：6.；3%25的技术失败，有的是因为前臂静脉描记的失败（22例），有的是因为肱静脉导管植入失败（41例）。