急性脑梗死患者伴脑内微出血的临床研究

目的探讨急性脑梗死合并脑内微出血(CMBs)的发生率、分布、演变的规律、出血转换的关系。方法采用回顾性的方法,对2005～2007年1039例患者进行研究,其中脑梗死患者678例(其中梗死后出血者27例),对照组361例。采用1.5 T Philips MRI对全部研究对象进行MR I自旋回波序列(SE)、快速自旋回波序列(FSE)、场回波序列(FE)、梯度回波(GRE)扫描。结果比较4种序列检查阳性率,证实CMBs在MRI-T2WI序列显影率最高,CMBs发生率在对照组、梗死组、梗死后出血组中依次为11%、22.6%、40.7%,差异有统计学意义(χ2=216.695,P=0.000),CMBs灶以皮质-皮质下、基底节区分布较多,幕下结构分布相对较少,但3组间比较分布差异无统计学意义(χ2=6.530,P=0.163)。脑梗死患者合并高血压病与非高血压分组,与对照组相比CMBs检出率未见明显差别(χ2=0.417,P=0.792).,CMBs分布规律与急性脑梗死分布区域不一致,两侧半球灶分布无明显差别(χ2=4.811,P=0.683);脑梗死患者与对照组的CMBs分级均以轻度为主,中重度发病相对较少,差异无统计学意义(P=0.181),梗死组中对36例CMBs患者动态观察发现:再梗死患者的新发微出血的比例高于无再梗死者(60.9%:23.1%,χ2=4.760,P=0.029)。结论通过MRI的GRE序列扫描发现急性脑梗死、再发脑梗死和梗死后出血患者微出血发生率高,但CMBs分布与梗死部位和梗死的严重的程度无关,推论CMBs发生可能与急性脑梗死发病时,在应激和缺血、缺氧的状态下出现的脑内广泛微血管病变有关。

Approaches of feature of MR in patients with acute cerebral infarction and intracerebral microbleeds

Objective To make out the feature of MRI in patients with acute cerebral infarction and intracerebral microbleeds(CMBs),as well as the occurrence and distribution and variation regularity of CMBs,and to approach the mechanism of the intracerebral microbleeds in patients with acute cerebral infarction.Methods A prospective study in clinical and MRI was performed since March 2005 to December 2007 in 1039 obejects including 361 controls and 678 cases of acute cerebral infarction,who were admitted to our hospit...