非手术指征颈动脉斑块患者缺血性脑卒中的危险因素分析

目的:探讨颈动脉狭窄≤50%的颈动脉斑块患者的MRI斑块特征及临床因素与发生缺血性脑卒中的关系。方法:选取2014年9月—2016年2月超声筛选颈动脉狭窄≤50%的颈动脉斑块患者43例,所有患者行核磁共振黑血成像检查,分析MRI斑块特征及其他危险因素与缺血性脑卒中的关系。结果:43例患者的颈动脉斑块狭窄程度5%～50%,随访时间1.9～19.4个月。随访期间发现脑梗死患者共4例。单因素与多因素Logistic回归分析结果显示,仅MRI的斑块内出血与缺血性脑卒中的发生有明显关系(OR=297.797,95%CI=2.638～33620,P=0.018),而其他斑块特征及临床因素均无明显关系(均P0.05)。Kaplan-Meier生存分析显示,有斑块内出血者较无斑块内出血者的中位无脑卒中时间明显缩短(14.3个月vs. 18.6个月,P=0.001);有冠心病者较无冠心病者的中位无脑卒中时间也明显缩短(12.1个月vs. 18.7个月,P=0.029);Cox回归分析显示,斑块内出血(HR=18.2,95%CI=2.7～123.3,P=0.003)及冠心病(HR=27.4,95%CI=1.6～464.3,P=0.022)是缺血性脑卒中发生的独立危险因素。结论:在颈动脉狭窄≤50%的颈动脉斑块患者中,斑块内出血与冠心病是缺血性卒中的发生密切相关。     

确炎舒松A瘢痕内注射联合扩张治疗儿童食管瘢痕狭窄46例

目的探讨儿童食管瘢痕狭窄的治疗方法与疗效。方法我们于近期采用确炎舒松A食管瘢痕内注射联合扩张治疗儿童食管瘢痕狭窄46例,观察其症状变化、狭窄直径、吞咽困难分级及并发症情况。结果 46例中,获及时扩张成功32例,于注射治疗后2~3周再行食管扩张14例。显效24例(占52.2%),有效19例(占41.3%),无效3例(占6.52%),总有效率93.5%。狭窄部位直径由(0.28±0.11)cm增至(0.95±0.34)cm,t=13.81,P0.01,差异有统计学意义。吞咽困难分级由(2.17±0.79)级降至(0.40±0.93)级,P0.01,差异有统计学意义。结论确炎舒松A食管瘢痕内注射联合扩张治疗儿童食管瘢痕狭窄是一种安全可靠的方法。     

急性心肌梗死患者血清sLOX-1、CK-MB水平及意义

目的探讨急性心肌梗死(AMI)患者血清可溶性凝集素样氧化型低密度脂蛋白受体-1(sLOX-1)和心肌型肌酸激酶同工酶(CK-MB)水平及意义。方法选取AMI患者120例(AMI组),同时选取健康体检者120例作为对照组,检测血清sLOX-1、CK-MB水平。结果AMI组患者血清sLOX-1、CK-MB水平明显高于对照组(P<0.05);AMI组左室舒张末期容积指数(LVEDVI)、左室收缩末期容积指数(LVESVI)和左室射血分数(LVEF)分别为(73.39±2.29)mL/m^2、(38.83±9.28)mL/m^2和(47.88±8.29)%;血清sLOX-1、CK-MB与LVEDVI、LVESVI和LVEF未见明显相关性(P>0.05);AMI组重度狭窄患者血清sLOX-1、CK-MB明显高于轻度和中度狭窄患者(P<0.05);中度狭窄患者血清sLOX-1、CK-MB明显高于轻度狭窄患者(P<0.05);血清sLOX-1、CK-MB与Gensini评分呈正相关(G=0.339和0.252,P<0.05),血清sLOX-1与CK-MB呈正相关(r=0.301,P<0.05)。结论急性心肌梗死患者血清SLOX-1、CK-MB水平升高,与冠状动脉狭窄程度有一定相关性。     

Coronary CT angiography

Coronary CT angiography (coronary CTA) represents an increasingly applied noninvasive method for coronary artery imaging. Due to technical development and improved spatial and temporal resolution of CT, high diagnostic value of coronary CTA is reported when compared to conventional selective angiography. The aim of this review is to present an overview of the clinical applications of coronary CTA. Important factors in patient selection and preparation are also briefly discussed.     

Effect of pulsatile swirling flow on stenosed arterial blood flow

The existence of swirling flow phenomena is frequently observed in arterial vessels, but information on the fluid-dynamic roles of swirling flow is still lacking. In this study, the effects of pulsatile swirling inlet flows with various swirling intensities on the flow field in a stenosis model are experimentally investigated using a particle image velocimetry velocity field measurement technique. A pulsatile pump provides cyclic pulsating inlet flow and spiral inserts with two different helical pitches (10D and 10/3D) induce swirling flow in the stenosed channel. Results show that the pulsatile swirling flow has various beneficial effects by reducing the negative wall shear stress, the oscillatory shear index, and the flow reverse coefficient at the post-stenosis channel. Temporal variations of vorticity fields show that the short propagation length of the jet flow and the early breakout of turbulent flow are initiated as the swirling flow disturbs the symmetric development of the shear layer. In addition, the overall energy dissipation rate of the flow is suppressed by the swirling component of the flow. The results will be helpful for elucidating the hemodynamic characteristics of atherosclerosis and discovering better diagnostic procedures and clinical treatments.