MRI of acute cerebral infarcts: increased contrast enhancement with continuous infusion of gadolinium

被引:26
作者
Merten, CL
Knitelius, HO
Assheuer, J
Bergmann-Kurz, B
Hedde, JP
Bewermeyer, H
机构
[1] Krankenhaus Merheim, Kliniken Stadt Koln, Neurol Klin, D-51109 Cologne, Germany
[2] Krankenhaus Merheim, Radiol Klin, D-51109 Cologne, Germany
关键词
cerebral infarcts; magnetic resonance imaging; contrast enhancement;
D O I
10.1007/s002340050740
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
We compared contrast enhancement on T1-weighted MRI of acute cerebral infarcts after conventional bolus administration and continuous infusion of gadolinium. We examined 12 patients with a history of acute stroke with contrast-enhanced MRI once a week for a 1 month. Only ischaemic lesions were investigated after cerebral haemorrhage had been excluded by CT. Each MRI study included T2- and proton density-weighted sequences for determination of the size and site of the infarct, immediate postinjection T1-weighted imaging after bolus administration of 0.1 mmol/kg gadolinium-DPTA and delayed T1-weighted imaging after additional continuous infusion of 0.1 mmol/kg over 2 h. A total of 42 MRI studies was performed. In the first week after the onset of stroke, most infarcts (8 of 10) did not enhance after bolus administration, whereas all showed distinct contrast enhancement after the infusion. In the following weeks all but two infarcts showed contrast enhancement after bolus administration; after continuous infusion contrast enhancement could be seen in all cases. While contrast enhancement after bolus administration showed the typical gyriform pattern, enhanced areas were more extensive after the infusion and usually covered the entire infarcted area shown on T2- and proton density-weighted images. We presume that the disturbed blood-brain barrier in ischaemic areas favours delivery of contrast medium to the infarcted tissue if it is offered continuously so that a steady state can develop.
引用
收藏
页码:242 / 248
页数:7
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