Thrombectomy in acute vertebrobasilar occlusion: a single-centre experience.

PURPOSE: Acute vertebrobasilar occlusion (VBO) has a grave clinical course; however, thrombectomy in VBO patients has rarely been reported. We retrospectively evaluated the clinical and radiological outcomes of thrombectomy in VBO patients. METHODS: From March 2010 to December 2017, 38 patients with 40 acute VBOs underwent thrombectomy at our hospital. Thrombectomy was performed using catheter aspiration (n = 11, 26.8%) or a stent retriever (n = 29, 70.7%). RESULTS: Good clinical outcomes (3-month modified Rankin scale (mRS) of 2 or lower) were achieved in 9 cases (22.5%), and successful recanalization (thrombolysis in cerebral infarction (TICI) grade of 2b or 3) was achieved in 35 cases (87.5%). Good clinical outcomes were significantly related to aetiologies other than atherosclerosis (p = 0.020) and lower National Institutes of Health Stroke Scale (NIHSS) scores on admission (p = 0.025). The clinical and radiological outcomes did not differ significantly between catheter aspiration and stent retriever thrombectomy (p = 1.000 and p = 0.603, respectively); however, stent retriever thrombectomy had a shorter procedure time than catheter aspiration (59.7 ± 31.2 vs. 84.5 ± 35.1 min, p = 0.037). CONCLUSION: In our series, good clinical outcomes were associated with a lower NIHSS score on admission and stroke aetiologies other than atherosclerosis. The two thrombectomy modalities showed similar clinical and radiological outcomes. However, stent retrievers seemed to allow more rapid recanalization than catheter aspiration in VBO.

Unexpected abnormal intraoperative neurophysiologic monitoring change by multiple spontaneous intracerebral haemorrhage during endovascular coiling.

We report a patient with multiple angiographically negative intracerebral haemorrhages, which were recognized by significant changes in intraoperative neurophysiologic monitoring during the coil embolization of a left middle cerebral artery aneurysm.

Angiographic and clinical outcomes of non-patent anastomosis after bypass surgery in adult moyamoya disease.

BACKGROUND: The clinical and radiologic outcomes of symptomatic adult moyamoya disease (MMD) patients who have an occluded anastomosis immediately after bypass surgery are poorly studied. The clinical and angiographic outcomes of non-patent anastomosis in symptomatic adult MMD patients were retrospectively reviewed. METHODS: From August 2011 to November 2016, 31 revascularization surgeries, consisting of direct and indirect bypass, were performed on 29 adult MMD patients. Primary outcomes were evaluated based on the frequency of transient ischaemic attack (TIA) incidence and the recurrence of cerebral infarction and were assessed as improvement or worsening. RESULTS: Among 31 cases, computed tomography angiography (CTA) on the first day after surgery showed patent anastomosis in 20 hemispheres and non-patent anastomosis in 11 hemispheres. Follow-up conventional angiographies showed spontaneous recanalization of non-patent anastomosis in all occlusion cases. The incidence of TIA decreased in both the non-patent and the patent groups. Two newly developed cerebral infarctions were observed, which occurred in the patent group. Patients in the non-patent group also showed clinical improvement after surgery (p = 0.04), and no significant relationship was found between immediate postoperative patency and the primary outcome (p = 0.53). CONCLUSIONS: In our series, regardless of patency immediately after bypass surgery, delayed recanalization and clinical improvement can be expected after bypass surgery for adult MMD.

Role of Neurosurgeons in the Treatment of Acute Ischemic Stroke in the Emergency Room.

OBJECTIVE: With the recent increase in mechanical thrombectomy (MT) for acute ischemic stroke (AIS), the role of neurosurgeons in AIS treatment has become increasingly important. This study aimed to assess the outcomes of patients with AIS treated by neurosurgeons and neurologists in the emergency room (ER) of a tertiary hospital in South Korea. METHODS: From January 2020 to June 2021, 536 patients with AIS within 24 hours of symptom onset were admitted to our hospital via the ER. Based on the type of doctors who provided initial care for AIS in the ER, patients were divided into two groups : (a) neurosurgeon group (n=119, 22.2%) and (b) neurologist group (n=417, 77.8%). RESULTS: Intravenous tissue plasminogen activator (tPA) was administered in 82 (15.3%) of 536 patients (n=17 [14.3%] in the neurosurgeon group and n=65 [15.6%] in the neurologist group). The door-to-tPA time was not significantly different between both groups (median, 53 minutes; interquartile range [IQR], 45-58 vs. median, 54 minutes; IQR, 46-74; p=0.372). MT was performed in 69 patients (12.9%) (n=25, 36.2% in the neurosurgeon group and n=44, 63.8% in the neurologist group). The neurosurgeon group achieved a shorter door-to-puncture time than the neurologist group (median, 115 minutes; IQR, 107-151 vs. median, 162 minutes; IQR, 117-189; p=0.049). Good clinical outcomes (3-month modified Rankin Scale 0-2) did not differ significantly between the two groups (96/119 [80.7%] vs. 322/417 [77.2%], p=0.454). CONCLUSION: The neurosurgeon group showed similar door-to-treatment time and clinical outcomes to the neurologist group in patients with AIS in the ER. This study suggests that neurosurgeons have comparable abilities to care for patients with AIS in the ER.

Clinical and radiological outcomes of mechanical thrombectomy in simultaneous anterior cerebral artery and middle cerebral artery occlusion.

OBJECTIVE: Simultaneous anterior cerebral artery (ACA) and middle cerebral artery (MCA) occlusion is rare. We investigated the clinical and radiological outcomes of patients with simultaneous ACA and MCA occlusion treated with mechanical thrombectomy. METHODS: We analyzed the clinical and radiological outcomes of 12 patients with simultaneous ACA and MCA occlusion treated with mechanical thrombectomy from January 2018 to December 2020. The clinical outcome was assessed using the modified Rankin Score (mRS) after 3 months of thrombectomy. The radiological outcome was assessed using the thrombolysis in cerebral infarction (TICI) score. RESULTS: The median National Institutes of Health Stroke Scale score at hospital arrival was 18 (interquartile range, 16-20). M1 was the most common occlusion lesion (n=8), and A3 was the most common lesion in the ACA (n=6). Six patients were first treated for MCA occlusion and later for ACA occlusion (MCA group). Other patients were first treated for ACA occlusion and later for MCA occlusion (ACA group). There was no difference in clinical outcomes between the MCA and ACA groups (p=0.180). Successful recanalization (TICI ≥2b) of MCA was achieved in 10 patients (83.3%). Successful recanalization of ACA was achieved in 10 patients (83.3%). Successful recanalization of both ACA and MCA occlusion was observed in eight patients (66.7%). Three patients (25%) had good clinical outcomes (mRS ≤2). CONCLUSIONS: In our series, simultaneous ACA and MCA occlusion showed relatively poor successful recanalization rates and poor clinical outcomes despite treatment with mechanical thrombectomy.

Salvage treatment with stenting and temporary balloon occlusion for subarachnoid hemorrhage after stent retrieval following acute proximal M3 occlusion treatment.

Procedure-related subarachnoid hemorrhage (SAH) after mechanical thrombectomy is known to be a clinically benign presentation. However, the treatment in the presence of definite contrast leakage without vessel rupture is controversial. Here, we report a case in which a salvage technique was performed for procedure-related SAH after mechanical thrombectomy for a proximal M3 occlusion. A 56-year-old female patient presented with global aphasia and right hemiparesis within 2 hours after symptom onset. The initial National Institute of Health Stroke Scale score of the patient was 18 points, and Computed tomography (CT) angiography showed that the superior division of the left middle cerebral artery (MCA) was occluded. We decided to treat the patient with mechanical thrombectomy. Control angiography showed a left proximal M3 occlusion. We performed mechanical thrombectomy with a partially deployed technique using a Trevo 3 mm stent (Stryker). Control angiography showed recanalization of the occluded vessel but contrast leakage after stent retrieval. We decided to treat the lesion presenting with contrast leakage with stenting using a Neuroform Atlas 3 mm stent (Stryker). Serial control angiography continued to show contrast leakage of the recanalized artery. We decided to treat the lesion with temporary balloon occlusion using a Scepter C balloon catheter (MicroVention). The patient recovered and had a modified Rankin scale score at discharge of 0. Given the results of our case, stenting and subsequent repeat temporary balloon occlusion should be considered for SAH with contrast leakage after mechanical thrombectomy, as spontaneous cessation of the arterial bleeding is unlikely.

Improving Door-To-Puncture Time in Mechanical Thrombectomy with Direct Care from a Neurointerventionalist in the Emergency Department.

OBJECTIVE: A shorter door-to-puncture time is an independent predictor of good clinical outcomes in patients with acute ischemic stroke (AIS) who undergo mechanical thrombectomy (MT). We recently initiated a protocol for direct care from neurointerventionalists (NIs) in the emergency department (ED) rather than from non-NI neurologists for patients with AIS. Our aim was to investigate whether NIs, as the first point-of-care physicians for stroke in the ED, could shorten door-to-puncture time compared to non-NI neurologists. METHODS: From January 2020 to December 2020, 50 patients with AIS underwent MT at our hospital. Patients were divided into 2 groups based on the type of physician who provided initial care for stroke in the ED: (a) NI group (n = 20) and (b) non-NI group (n = 30). The door-to-puncture time was retrospectively analyzed. RESULTS: The NI group had a significantly shorter door-to-puncture time than the non-NI group (135.2 ± 50.0 minutes vs. 167.2 ± 54.3 minutes, P = 0.040). A door-to-puncture time of ≤120 minutes was more frequently achieved in the NI group than in the non-NI group (55.0% vs. 23.3%, P = 0.022). Multivariable logistic regression analysis revealed that a door-to-puncture time of ≤120 minutes was independently associated with the NI group (adjusted odds ratio 4.098, 95% confidence interval 1.085-15.479, P = 0.037). CONCLUSIONS: Our study showed that NIs, as the first point-of-care stroke physicians in the ED, were associated with shorter door-to-puncture times. We suggest that NIs should be at the forefront of care for patients with AIS in the acute setting by performing triage and deciding on and performing MT.

Differences between proximal and distal M1 occlusions after mechanical thrombectomy.

PURPOSE: Whether M1 occlusions proximal (pM1) and distal (dM1) to the lenticulostriate perforators result in different clinical outcomes after mechanical thrombectomy (MT) is unknown. We retrospectively compared the clinical outcomes and baseline characteristics of patients with these two types of occlusions. METHODS: From March 2010 to May 2019, we performed MT for 141 M1 occlusions, including pM1 occlusions (n = 58) and dM1 occlusions (n = 83). RESULTS: Good clinical outcomes (modified Rankin Scale score 0 to 2) were achieved in 28 out of 58 (48.3%) patients with pM1 occlusions and 46 out of 83 (55.4%) patients with dM1 occlusions without significance (p = 0.493). Cardioembolic occlusions represented 19 out of 58 (32.6%) pM1 occlusions and 53 out of 83 (63.9%) dM1 occlusions, and atherosclerotic occlusions represented 37 out of 58 (63.8%) pM1 occlusions and 27 out of 83 (32.5%) dM1 occlusions, with significance (p = 0.001). Rescue treatments, such as balloon angioplasty or stenting, were needed more for pM1 occlusions than dM1 occlusions (21 out of 58 (36.2%) vs. 8 out of 83 (9.8%), p < 0.001). The multivariable logistic regression analysis demonstrated that the need for rescue treatment was associated with pM1 occlusions (adjusted odds ratio; 3.804, 95% confidence interval; 1.306-11.082, p = 0.014). CONCLUSIONS: In our series, pM1 and dM1 occlusions did not significantly differ in good clinical outcomes. Our study also showed that pM1 occlusions were more strongly associated with atherosclerotic occlusions, while dM1 occlusions were more strongly associated with cardioembolic occlusions, and rescue treatments were needed more often for pM1 occlusions than dM1 occlusions.

Transient neurological deterioration due to watershed shift after STA-MCA bypass surgery in acute atherosclerotic occlusion.

Superficial temporal artery (STA)-middle cerebral artery (MCA) bypass surgery is considered not the primary but the last treatment option for acute atherosclerotic occlusions refractory to medical treatment. We retrospectively evaluated patients who underwent STA-MCA bypass surgery for acute atherosclerotic occlusion intractable to other treatments. From June 2010 to May 2014, 10 patients underwent STA-MCA bypass surgery for acute atherosclerotic occlusion at our hospital. The sites of occlusion were the internal carotid artery (n = 5) and the proximal MCA (n = 5). All 10 patients showed good patency in the anastomosis after bypass surgery, and postoperative cerebral angiography showed a newly formed border zone between the existing collateral blood flow and bypass graft blood flow. Transient neurological deterioration (TND) developed in 4 patients after STA-MCA bypass surgery (40%). All 4 patients showed worsened hemiparesis or aphasia 2-3 days after bypass surgery and improvement in neurological deficits within 1 week after bypass surgery. Diffusion MRI in patients with TND showed new cerebral infarctions near the newly formed border zone. In our series of bypass surgeries for acute atherosclerotic occlusion, postoperative changes in hemodynamic status, also called watershed zone shift, may be one of the causes of new cerebral infarctions near the newly formed border zone.

Differences in thromboembolism after stent-assisted coiling for unruptured aneurysms between aspirin plus clopidogrel and ticagrelor.

PURPOSE: To reduce procedural thromboembolisms, tailored antiplatelet drug preparation has been used according to antiplatelet resistance for endovascular coiling of unruptured aneurysms. We compared an aspirin plus clopidogrel group with a ticagrelor group using diffusion-weighted imaging (DWI) after stent-assisted coiling for unruptured aneurysms. METHODS: From October 2018 to April 2019, 72 patients with 78 aneurysms underwent stent-assisted coiling, with aspirin plus clopidogrel (n = 20 patients with 22 aneurysms) or ticagrelor (n = 52 patients with 56 aneurysms) as an antiplatelet preparation, and were enrolled in our study. All patients were evaluated using DWI 2 h after coiling to detect procedural thromboembolisms. RESULTS: Postprocedure infarction was observed on DWI in 37 procedures (47.4%), and symptomatic infarction occurred in 1 procedure (1.28%). Postprocedure infarction was significantly lower in the aspirin plus clopidogrel than in ticagrelor group (27.3% vs. 55.4%, p = 0.043). Postprocedure infarction was associated with aneurysm type (sidewall aneurysm (30.8%) vs. aneurysm with incorporated branches (64.1%), p = 0.006) and guiding catheter type (single (23.8%) vs. double (56.1%), p = 0.020). Multivariable logistic regression analysis demonstrated that postprocedure infarction was related to aneurysm type (adjusted odds ratio (OR); 3.317, confidence interval (CI); 1.223-8.991, p = 0.018), guiding catheter type (adjusted OR; 2.783, CI; 0.828-9.353, p = 0.098), and antiplatelet medication (adjusted OR; 1.295, CI; 0.969-1.730, p = 0.080). CONCLUSIONS: Postprocedure infarction was observed on DWI after stent-assisted coiling for unruptured aneurysms more frequently in the ticagrelor group than in the aspirin plus clopidogrel group. However, our study suggests that postprocedure infarction is more associated with aneurysm type than antiplatelet medication.

An investigation of thalamic nuclei volumes and the intrinsic thalamic structural network based on motor subtype in drug naïve patients with Parkinson's disease.

INTRODUCTION: This study aimed to investigate the alterations in thalamic nuclei volumes and the intrinsic thalamic structural network in patients with de novo Parkinson's disease (PD) based on their predominant symptoms. METHODS: We enrolled 65 patients with de novo PD (44 patients with tremor-dominant [TD] subtype and 21 patients with postural instability and gait disturbance [PIGD] subtype) and 20 healthy controls. All subjects underwent three-dimensional T1-weighted magnetic resonance imaging. The thalamic nuclei were segmented using the FreeSurfer program. RESULTS: We obtained volumetric differences in the thalamic nuclei of each subtype of PD in comparison of healthy control. Volumes of the right and left suprageniculate nuclei were significantly increased, whereas that of the left parafascicular nucleus was decreased in patients with the TD subtype. Volumes of the right and left suprageniculate nuclei and right ventromedial nucleus were significantly increased, whereas those of the right and left parafascicular nuclei volumes were decreased in patients with the PIGD subtype. The measures of the intrinsic thalamic global network were not different between patients with TD PD and healthy controls. However, in patients with the PIGD subtype, the global and local efficiencies were significantly increased compared to healthy controls. Moreover, although there were no differences in thalamic volume and intrinsic thalamic global network between patients with the TD and PIGD variants, we identified significant differences in the intrinsic thalamic local network between the two groups. CONCLUSIONS: Alterations in thalamic nuclei volumes and the intrinsic thalamic network in patients with PD differed based on their predominant symptoms. These findings might be related to the underlying pathogenesis and suggest that PD is a heterogeneous syndrome.

Hybrid mechanical thrombectomy for acute ischemic stroke using an intermediate aspiration catheter and Trevo stent simultaneously.

PURPOSE: To overcome the limitations of traditional mechanical thrombectomy (MT), including catheter aspiration and stent retrievers, such as thrombus fragmentation or migration, we designed hybrid MT using an intermediate aspiration catheter and a Trevo stent simultaneously. We retrospectively compared hybrid MT with the traditional MT. METHODS: From January 2017 to January 2019, we performed MT on 91 occlusions, including internal carotid artery bifurcation (n = 17), M1 segment (n = 53) and M2 segment (n = 21), using hybrid MT (n = 42) and traditional MT (n = 49). RESULTS: Hybrid MT had a shorter procedure time (52.4 ± 22.0 vs. 73.0 ± 36.2 min, p = 0.002) and fewer attempts (1.50 ± 0.86 vs. 1.92 ± 1.10 times, p = 0.049) than traditional MT did. Hybrid MT achieved more good clinical outcome (3-month modified Rankin Scale score, 2 or less) and better successful recanalization (Thrombolysis In Cerebral Infarction grade, 2b or 3) than traditional MT did, but the difference was not significant (61.9% vs. 55.1%, p = 0.531, 92.9% vs. 87.8%, p = 0.498). Hybrid MT showed a higher first pass successful recanalization rate than traditional MT did (69.0% vs. 40.8%, p = 0.011). Multivariable logistic regression analysis demonstrated that first pass successful recanalization is related to the M1 segment rather than other segments (adjusted odds ratio (OR); 3.277, confidence interval (CI); 1.227-8.749, p = 0.018) and hybrid MT rather than traditional MT (adjusted OR; 4.995, CI; 1.725-14.460, p = 0.003). CONCLUSIONS: Hybrid MT can be used as a first-line MT modality, particularly in M1 occlusion, based on our high first pass successful recanalization results.

Contralateral Mechanical Thrombectomy of Partial Deployed Stent Retrieval for Acute Anterior Inferior Cerebellar Artery Occlusion.

BACKGROUND: Acute anterior inferior cerebellar artery (AICA) occlusion is considered an acute ischemic stroke requiring medical treatment without mechanical thrombectomy (MT). There is a procedural risk of parent vessel rupture, but neurologic deficits are not generally severe. Here, we report a case of MT performed using partially deployed stent retrieval for acute AICA occlusion. CASE DESCRIPTION: A 53-year-old male patient presented with acute-onset drowsiness and visual disturbance. The initial National Institutes of Health Stroke Scale score of the patient was 5. Computed tomography angiography showed no definite vascular occlusion, but computed tomography perfusion imaging suggested decreased cerebral blood flow and cerebral blood volume, with an increased mean transit time and time to peak in the left posterior inferior cerebellar artery territory. Conventional angiography showed occlusion of the left proximal AICA and posterior inferior cerebellar artery cortical branches, which were reconstituted by the muscular branches of the left vertebral artery. We decided to perform intra-arterial thrombectomy for proximal left AICA occlusion because the patient's symptoms seemed to be aggravated, and neurologic deficits were not expected. MT was performed using a Trevo stent (Stryker Neurovascular, Fremont, California, USA) in the left proximal AICA via a right vertebral artery approach and resulted in complete recanalization of the occluded AICA. The patient recovered and had an National Institutes of Health Stroke Scale score of 0 at 1 day after MT. CONCLUSIONS: Our case suggests that MT can be performed in a highly selective manner in patients with the occlusion of a posterior circulation branch, such as the AICA, and yield a good clinical outcome.