Large-Vessel Occlusion Stroke Treated by Endovascular Thrombectomy in Patient with Coronavirus Disease 2019.

We report a case of acute ischemic stroke caused by large-vessel occlusion in a patient infected with coronavirus disease 2019 (COVID-19) who was treated by endovascular thrombectomy. The patient was a 41-year-old man hospitalized with moderately severe COVID-19. Fourteen days after the onset of COVID-19, dysarthria and right hemiplegia were observed, and acute occlusion of the left middle cerebral artery was diagnosed. Mechanical thrombectomy was performed with a stent retriever while the patient was under local anesthesia and sedation. The staff involved in the intervention was as minimal as possible. The interventional surgeon wore a disposable surgical gown, an N95 mask, a face shield, and two pairs of gloves, while the patient was fitted with a surgical mask. The intervention involved the usual procedures, such as sheath insertion, catheter manipulation, and stent deployment, and the thrombus was removed with the stent retriever. The time from puncture to recanalization was within 30 minutes. No infection was observed in our staff or inpatients after the intervention. Thus, we were able to perform neuroendovascular treatment without spreading COVID-19 by taking appropriate measures to prevent infection.

Virtual histology analysis of carotid atherosclerotic plaque: plaque composition at the minimum lumen site and of the entire carotid plaque.

BACKGROUND: Virtual Histology intravascular ultrasound (VH IVUS) volumetric analysis (analysis of the entire plaque responsible for stenosis) has been used for carotid plaque diagnosis. Knowing the carotid plaque characteristics by analyzing the plaque composition only at the minimum lumen site will facilitate plaque diagnosis using VH IVUS. PURPOSE: To detect the relationship between the VH IVUS volumetric analysis of the entire plaque responsible for carotid artery stenosis and the VH IVUS cross-section plaque analysis at the minimum lumen site. METHODS: Forty-eight atherosclerotic cervical carotid stenoses in 45 consecutive patients were included in the study. VH IVUS was obtained during the carotid artery stenting procedure. RESULTS: Simple regression analysis revealed that the volumetric proportion of each plaque type correlated significantly with the corresponding plaque-type area at the minimum lumen site. The adjusted coefficients of determination of the simple regression analyses were .782 (P < .001) for fibrous tissue, .741 (P < .001) for fibrofatty tissue, .864 (P < .001) for dense calcium, and .918 (P < .001) for necrotic core. CONCLUSION: The plaque composition at the minimum lumen site represents the volumetric composition of the entire carotid plaque that causes atherosclerotic cervical carotid artery stenosis.

Selective propofol injection into the M1 segment of the middle cerebral artery (MCA Wada test) reduces adverse effects and enhances the reliability of the Wada test for determining speech dominance.

OBJECT: The Wada test is had been the most reliable for determining speech dominance. Drugs injected into the internal carotid artery, however, may be heterogeneously distributed as the result of asymmetry of the anterior cerebral arteries and the presence of a fetal-type posterior cerebral artery. Variations in drug distribution could occasionally alter consciousness and complicate the evaluation of the test results. We examined selective propofol injection into the M1 segment of the middle cerebral artery (MCA Wada test). METHODS: For the MCA Wada test (17 patients), 7 or 8 mg of propofol was injected via a microcatheter navigated into the M1 segment, and language function was evaluated by patient performing several tasks. The conventional Wada test (internal carotid artery [ICA] Wada test) was performed in four patients (both the ICA and MCA Wada tests were performed in one patient). The efficacy and adverse effects of both procedures were evaluated; all tests were performed by well-trained interventional neuroradiologists. RESULTS: Immediately after propofol injection during the MCA Wada test, patients developed transient contralateral hemiplegia and transient aphasia (in the case of injection on the dominant side). Confusion and other severe adverse effects did not occur during the MCA Wada test, but two of four patients who underwent the ICA Wada test showed altered consciousness that affected the performance of the test. CONCLUSIONS: The MCA Wada test is a feasible and reliable preoperative evaluation, if performed by a trained team of interventional neuroradiologists.

Evaluation of the characteristics of various types of coils for the embolization of intracranial aneurysms with an optical pressure sensor system.

INTRODUCTION: In coil embolization for an intracranial aneurysm, it is important to appropriately choose the coil most suitable for coping with various unforeseen situations. Additionally, because dense coil packing of the aneurysm sac is the most important factor to avoid a recurrence, properly selecting the coil is essential. In this article, the authors measured the coil insertion pressure of various types of coils with a newly developed sensor system, and coil characteristics were investigated. METHODS: The sensor consists of a hemostatic valve connected to the proximal end of a microcatheter. The sensor principle is based on an optical system. Using this, an experimental silicone aneurysm embolization was performed automatically at constant speed. The pattern of the insertion pressure and the maximum insertion pressure (MIP) were analyzed for the various types of coils. The sensor continuously monitored the mechanical force during the insertions. RESULTS: The sensor adequately recorded the coil insertion pressure during embolization in each coil. MIP was generally ranked in order of the coil type. The soft type coils required relatively less insertion pressure than standard/helical and 3D type. As for the patterns of coil insertion pressure, each coil presented a saw-like pressure pattern, though we observed some slight differences. 3D type coils showed peak pressure at the moment of "painting". Coil loop diameters barely affected MIP. However, as to the patterns of pressure, larger size coils more often presented the peak. CONCLUSIONS: Coil characteristics were well evaluated. The results obtained here reflected some actual clinical experience. Furthermore, collecting the in vivo study is mandatory, which may provide clinically useful data.

A novel pressure sensor with an optical system for coil embolization of intracranial aneurysms. Laboratory investigation.

OBJECT: In endovascular coil embolization for an intracranial aneurysm, the excessive pressure created during coil insertion into an aneurysm can cause a catastrophic rupture or dislodge a microcatheter tip from the aneurysm dome, resulting in insufficient embolization. Such undue mechanical pressure can only be subjectively detected by the subtle tactile feedback the surgeon experiences. Therefore, the authors of this study developed a new sensor device to measure the coil insertion pressure via an optical system. METHODS: This novel sensor system consists of a hemostatic valve connected to the proximal end of a microcatheter (Y-connector). The sensor principle is based on an optical system composed of a light-emitting diode (LED) and a line sensor. The latter measures how much the coil-delivery wire slightly bends in response to the insertion pressure by detecting the wire shadow. This information is translated into a given force level. Experimental aneurysm embolization was performed using this optical sensor. A silicone aneurysm model and an in vivo model (porcine aneurysm model) were used in this study. Several surgeons manually performed the coil insertions. The sensor continuously monitored the mechanical force during the insertions. RESULTS: The sensor adequately recorded the coil insertion pressure during embolization. The presence of the sensor did not hinder the embolization procedure in any way. During embolization in the silicone aneurysm model, a sinusoid pattern of pressure occurred, reflecting actual clinical experience. Similar results were obtained in the in vivo study. CONCLUSIONS: This new sensor device adequately measures coil insertion pressure. This system provides potentially safer and more reliable aneurysm embolizations.

[Assessment of mental condition and anxiety in patients receiving neuroendovascular treatment].

OBJECTIVE: Neuroendovascular treatment (NET) is an effective and minimally invasive procedure used for patients with vascular disease of the central nervous system. The purpose of this study was to examine anxiety levels using standardized psychometric tools and an original questionnaire among patients before and after NET. METHOD: A total of 40 patients who underwent NET were included. There were 18 patients with unruptured cerebral aneurysm, 18 with carotid stenosis, and 4 other cases. Patients were asked to complete a State-Trait Anxiety Inventory (STAI) and also to fill out a questionnaire about perioperative anxiety. It elicited the following information: (a) state-anxiety score and level before and after NET; (b) trait-anxiety score and level before and after NET; and (c) perioperative anxiety about NET. In all cases, the procedure was performed under local anesthesia. RESULTS: The preprocedural state-anxiety score was high in many patients (82%). The principal cause of the preprocedural anxiety was the procedure-related complications (92%). Patients with cerebral aneurysm experienced anxiety during the procedure because they could not know which stage of the procedure was involved. Their state-anxiety score was improved in the postprocedural examination (88%). However, patients were still anxious about postoperative complications and recurrence, particularly those with cerebral aneurysm. Patients with cerebral aneurysm generally tended to experience a higher level of anxiety than those with carotid stenosis. CONCLUSION: Though NET is apt to be thought as a relatively easy procedure, patients actually felt much anxiety, especially those with cerebral aneurysm. Due care for perioperative anxiety in patients who undergo NET is important.

Usefulness of three-dimensional digital subtraction angiography in endovascular treatment of a spinal dural arteriovenous fistula.

The use of 3D digital subtraction (DS) angiography provides a better understanding of spinal vascular lesion architecture. The authors report on 2 cases involving a spinal dural arteriovenous fistula (DAVF) and demonstrate the usefulness of 3D DS angiography for endovascular treatment of these spinal DAVFs. In both cases, middle-aged male patients suffered from bilateral leg hypesthesia, gait disturbance, and urinary dysfunction several months before treatment. Spinal angiography revealed DAVFs that were fed by a radicular artery branching from the intercostal artery and draining veins proceeding superiorly along the perimedullary veins. Endovascular embolization was performed in both cases. Selective 3D DS angiography of the intercostal artery clearly demonstrated the tortuous course of the feeder and the relationship among the feeding artery, fistula point, and draining veins in each case. This information was very useful in selecting a working angle for manipulating the microcatheter and for glue injection. In addition, the maximum intensity projection image from rotational DS angiography data clearly showed the fistula point at the dural sleeve and feeder entering the spinal canal via the intervertebral foramen and the relationship with the bone structure. Successful obliteration of the fistulae was achieved in both cases. Selective spinal 3D DS angiography was very useful in understanding the complex spinal vascular architecture and in choosing the best working angle and therapeutic strategy for endovascular treatment of spinal DAVFs.