摘要: 初始直立性低血压(initial orthostatic hypotension, IOH)是指从卧位或者坐位转换为站立位15 s内出现短暂性血压下降、脑血流灌注不足的现象,表现为收缩压下降≥40和/或舒张压下降≥20 mm Hg(1 mm Hg=0.133 kPa),这有别于经典直立性低血压(classic orthostatic hypotension, COH)