这个词是什么意思？
A syndrome of ORTHOSTATIC INTOLERANCE combined with excessive upright TACHYCARDIA, and usually without associated ORTHOSTATIC HYPOTENSION. All variants have in common an excessively reduced venous return to the heart (central HYPOVOLEMIA) while upright.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D054972 · MeSH 2026。
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