Aim: Intraplaque hemorrhage (IPH) belongs to potential mechanisms of plaque instability subsequently leading to ischemic stroke. Study aims to compare the IPH occurrence in patients with symptomatic (SS), asymptomatic stable (AS) and asymptomatic progressive (AP) internal carotid artery (ICA) stenosis ≥ 50%.
Materials and methods: Serial duplex ultrasound (DUS) in a 6-month period and MRI using axial 3DT1_MPRAGE sequence were used for IPH detection in patients with ICA stenosis. Stenoses in patients with ipsilateral ischemic stroke / transient ischemic attack within the previous 4 weeks or acute ischemic lesion on diffusion-weighted MRI sequencies were evaluated as symptomatic. Stenoses with progression of > 10% since last DUS examination were evaluated as progressive. Echolucent part of atherosclerotic plaque > 8 mm2 on DUS and hyperintensity on 3DT1_MPRAGE-MRI were evaluated as IPH. Differences in IPH occurrence between SS, AS and AP ICA stenoses were statistically evaluated.
Results: A total of 52 patients (33 males, mean age 69.2 ± 9.0 years) with 59 ICA stenoses were enrolled in the prospective study during 15 months; 13 ICA stenoses were evaluated as SS, 27 as AS and 19 as AP. IPH was detected using DUS/ MRI in 6 (46%) / 4 (30%) of SS, 12 (44%) / 8 (30%) of AS, and 11 (58%) / 11 (58%) of AP ICA stenoses (P > 0.05 in all cases). IPH was detected using combination of both methods in 3 (23%) of SS, 4 (15%) of AS, and 7 (36%) of AP ICA stenoses (P > 0.05 in all cases).
Conclusion: IPH was more frequently detected in asymptomatic progressive than asymptomatic stable ICA stenoses. No significant differences were found between occurrence of IPH in symptomatic than in asymptomatic progressive ICA stenoses. A total of 200 patients will be enrolled in the ongoing study.
The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study.
The Editorial Board declares that the manuscript met the ICMJE “uniform requirements” for biomedical papers.
材料和方法：将6个月的串行双工超声（DUS）和使用轴向3DT1_MPRAGE序列的MRI用于ICA狭窄患者的IPH检测。将同侧缺血性卒中/前4周内短暂性缺血性发作或弥散加权MRI序列的急性缺血性病变的患者进行症状评估。自上次DUS检查以来进展> 10％的狭窄被评估为进展性。在DUS上动脉粥样硬化斑块的回声部分> 8 mm2和在3DT1_MPRAGE-MRI上的高强度被评估为IPH。统计评估SS，AS和AP ICA狭窄之间IPH发生的差异。
结果：前瞻性研究共纳入52例患者（33例男性，平均年龄69.2±9.0岁），其59例ICA狭窄在15个月内进入研究。 13种ICA狭窄评估为SS，27种评估为AS，19种评估为AP。使用DUS / MRI检测到IPH在SS的6（46％）/ 4（30％），AS的12（44％）/ 8（30％）和AP的11（58％）/ 11（58％）中被检测到ICA狭窄（在所有情况下P> 0.05）。使用这两种方法的组合，在3个SS中（23％），4个AS（15％）和7个（36％）AP ICA狭窄中检测到IPH（在所有情况下P> 0.05）。
internal carotid artery – stenosis – ultrasound – intraplaque hemorrhage