Conclusion Sublingual isosorbide dinitrate administration before ITTT is a simple practical test with high sensitivity, powerful specificity and short duration in diagnosis of NMS.

• 结论ITTT加硝酸异山梨醇酯舌下含化是一种敏感性高、特异性强、节时的诊断血管迷走性晕厥的一种方法。