3.0-t diffusion images after clipping of middle cerebral artery aneurysm.

Abstract

AIm: Replacement of aneurysm clips or temporary parent artery occlusion during aneurysm clipping (AC) carries the risk of inducing postoperative neurologic deficits. When studying the risk of surgical complications associated with cerebral aneurysms, patients with similar conditions should be compared to eliminate the influence of rupture and location of aneurysm. mAterIAl and methOds: We used 3.0-Tesla (3.0T) magnetic resonance diffusion-weighted imaging (DWI) and magnetic resonance angiography (MRA) to analyze surgical complications after AC. A total of 42 AC procedures for 40 unruptured and 2 delayed-phase ruptured MCA aneurysms were evaluated. results:In six patients, temporary parent artery occlusion was performed. Asymptomatic hyperintensities were observed on DWI of three patients. In one patient, an asymptomatic lesion was most likely caused by a small contusion that occurred during dissection of an aneurysm attached to the brain surface. In two patients, asymptomatic cortical lesions were caused by brain surface contusions due to lacerations of the open dura. No symptomatic hyperintensities on DWI were observed after surgery. No fixed ischaemic neurologic deficits resulted from AC.COnClusIOn: Although some postoperative abnormalities were observed with 3.0T DWI, we found clipping of MCA aneurysms to be a safe procedure with a low risk of ischaemic complications. BulGulAr: Altı hastada geçici ana arter oklüzyonu yapıldı. Asemptomatik hiperintansite üç hastada DWI ile görüldü. Bir hastada asemptomatik bir lezyonun beyin yüzeyine tutunmuş bir anevrizmanın diseksiyonu sırasında oluşan bir küçük kontüzyon nedeniyle gelişmesi muhtemeldi. İki hastada, asemptomatik kortikal lezyonlar açık dura laserasyonu sonucunda beyin yüzeyi kontüzyonları nedeniyleydi. Cerrahi sonrasında DWI ile semptomatik hiperintansite gözlenmedi. Anevrizma klipsleme sonucunda herhangi bir sabit iskemik nörolojik defisit oluşmadı.sOnuÇ: 3,0 T DWI ile bazı postoperatif anormallikler görüldü ama MCA anevrizmalarının klipslenmesinin düşük bir iskemik komplikasyon riskiyle güvenli bir işlem olduğunu saptadı.

Study on Film Formability of Thermosetting Phenolic Resin Film

“…The materials and energy consumption can also be saved. What is more, because of the low volatile of prepregs, the composite products could show low porosity and excellent mechanical properties [10][11][12][13][14][15][16][17]. The resin content of the prepregs could be controlled precisely by this method, sharply contrary to solution dipping method.The hot-melt impregnation process for manufacturing the prepregs can be classified into the direct hot-melt impregnation and the hot-melt film impregnation [18][19][20].…”