Objective: To explore the first-pass effect in Small intestine.
目的：探讨小肠在首过效应中的作用。
Objective To evaluate the characteristics of myocardial perfusion and therapeutic effect of acute myocardial infarction using first pass perfusion MR imaging.
目的采用MR首过灌注成像评价急性心肌梗死心肌组织血流灌注特点及治疗效果。
Because of a serious liver first-pass effect, the dosage forms of Naloxone Hydrochloride is mainly used on domestic and aboard clinical practice in the forms of injection and sublingual tablet.
但由于该药肝脏首过效应严重，口服无效，目前国内外临床上供应用的盐酸纳洛酮的剂型为注射液和舌下片。
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