C Ionita

Safety and Effectiveness of Endovascular Therapy After 8 Hours of Acute Ischemic Stroke Onset and Wake-Up Strokes

Background and Purpose— This is a retrospective review of patients who underwent endovascular recanalization ≥8 hours after acute ischemic stroke symptom onset, including wake-up strokes, between June 2005 and June 2008. Methods— Thirty patients with a premorbid modified Rankin score ≤1 and NIHSS between 5 and 22 were included. All had admission CT, CTA, and CT perfusion scans to evaluate for salvageable brain tissue. Recanalization effectiveness was assessed by angiograms obtained within 30 hours after intervention. Patient, treatment characteristics, and immediate and 3-month outcomes were analyzed. Results— Mean NIHSS at presentation was 13 (median=12). Mean interval between time last-seen well and angiogram was 12.75 hours (median=10). Twenty-six patients (86.7%) presented with complete-to-near-complete vessel occlusion (thrombolysis in myocardial infarction [TIMI] 0/1); 4 had partial vessel occlusion (TIMI 2). Interventions included intra-arterial pharmacological thrombolysis (n=10), mechanical thrombectomy(n=21; Merci, 16; intracranial stent, 9; extracranial stent, 3), angioplasty (n=14; intracranial, 11; extracranial, 3). Nine patients received GPIIb/IIIa inhibitors (eptifibatide); all received heparin. Partial-to-complete recanalization (TIMI 2/3) was achieved in 20 patients (66.7%). Procedure-related complications included vascular perforations (n=3) and femoral access site complication (n=1). One patient had an embolic anterior cerebral artery infarct during intervention; another had progression of brain stem infarct. Symptomatic intracerebral hemorrhage occurred in 3 patients (10%), with 2 being primarily subarachnoid in location. Total in-hospital mortality including procedural mortality, disease progression, or other comorbidities was 23.3% (n=7). Mean discharge NIHSS was 9.5, representing an overall NIHSS 3.5-point improvement. Overall, mean modified Rankin score at death or last follow-up (mean=10.6 months) was 4.2. At 3 months, total mortality was 33.3% (n=10), 20% had modified Rankin score ≤2, and 33% had modified Rankin score ≤3. Among survivors, mean modified Rankin score at 3-month follow-up was 3. Conclusion— Our data show that delayed endovascular revascularization of carefully selected patients is safe, effective, and improves clinical outcome.

Acute Ischemic Stroke and Infections

We present an overview of multiple infections in relation to acute ischemic stroke and the therapeutic options available. Conditions that are a direct cause of stroke (infectious endocarditis, meningoencephalitides, and human immunodeficiency virus infection), the pathophysiologic mechanism responsible for stroke, and treatment dilemmas are presented. Independently or in conjunction with conventional risk factors, chronic and acute infections can trigger an acute ischemic stroke through an accelerated process of atherosclerosis and immunohematologic alterations. Acute ischemic stroke has a negative impact on the antibacterial immune response, leading to stroke-induced immunodepression and infections, the most common poststroke medical complications. Poststroke infections are independent predictors of poor outcome. Antibiotic trials for poststroke infection prevention are reviewed. Although antibiotic prophylaxis is not the standard of care in acute stroke, current guidelines support prompt treatment of stroke-related infections.

Cerebral small vessel disease: cognition, mood, daily functioning, and imaging findings from a small pilot sample.

Cerebral small vessel disease, a leading cause of cognitive decline, is considered a relatively homogeneous disease process, and it can co-occur with Alzheimer’s disease. Clinical reports of magnetic resonance imaging (MRI)/computed tomography and single photon emission computed tomography (SPECT) imaging and neuropsychology testing for a small pilot sample of 14 patients are presented to illustrate disease characteristics through findings from structural and functional imaging and cognitive assessment. Participants showed some decreases in executive functioning, attention, processing speed, and memory retrieval, consistent with previous literature. An older subgroup showed lower age-corrected scores at a single time point compared to younger participants. Performance on a computer-administered cognitive measure showed a slight overall decline over a period of 8–28 months. For a case study with mild neuropsychology findings, the MRI report was normal while the SPECT report identified perfusion abnormalities. Future research can test whether advances in imaging analysis allow for identification of cerebral small vessel disease before changes are detected in cognition.

Acute ischemic stroke and thrombolysis location: comparing telemedicine and stroke center treatment outcomes.

Abstract Background: Telemedicine has been increasingly used as an option for acute ischemic stroke treatment at hospitals where neurological expertise is not available. The aim of this study was to compare the outcome of stroke patients treated with systemic thrombolysis at our academic hub regional stroke centers (hub) versus our spoke hospital telemedicine locations (spoke). Methods: Data were retrospectively reviewed for consecutive patients admitted for stroke treatment with intravenous tissue plasminogen activator at our hub (128 patients) and at the spoke centers (27 patients) over a 2-year period. Mortality was selected as a primary outcome measure, and post-thrombolysis intracranial hemorrhage (PT-ICH) rate, hospital length of stay (LOS), and discharge modified Rankin Scale (mRS) score were selected as secondary outcome measures. Logistic regression models were used to determine the effect of thrombolysis treatment site on stroke outcomes. Results: Demographic and clinical variables of patients treated at the hub versus spoke sites were similar, except for a lower initial platelet count and a shorter time from ictus onset to needle in the spoke group. With covariates, the treatment site (hub vs spoke) did not have a significant impact on mortality (10.9% vs 11.1%; P = 0.34), nor on PT-ICH (20.3% vs 33.3%; P < 0.35). Site did not reach significance in affecting discharge outcome: 52.3% versus 51.9% of patients had good outcomes (mRS 0–3) and 47.7% versus 48.1% patients had poor outcomes (mRS, 4–6; P = 0.16). Length of stay was also not significantly affected by site: 8.8 days versus 10.7 days (P < 0.23). Conclusion: The hub-and-spoke telemedicine model for acute ischemic stroke treatment seems to carry similar efficacy and safety outcomes at the regional academic hub and spoke centers.

Impact of Ruptured Cerebral Aneurysm Coiling and Clipping on the Incidence of Cerebral Vasospasm and Clinical Outcome

This study assessed the impact of treatment modality of aneurysmal subarachnoid hemorrhage (aSAH) on the rate of vasospasm (VSP), mortality, and hospital length of stay (LOS) of patients with aneurysmal subarachnoid hemorrhage (aSAH).

Timing of Symptomatic Vasospasm in Aneurysmal Subarachnoid Hemorrhage: The Effect of Treatment Modality and Clinical Implications

A better prediction of the time course of symptomatic vasospasm (SVSP) might have a significant impact on the management and prevention of delayed neurologic ischemic deficit (DIND). We studied the influence of the treatment for ruptured aneurysm on SVSP timing. We retrospectively analyzed data of consecutive patients with aneurysmal subarachnoid hemorrhage (aSAH) admitted in our center between 1999 and 2005, treated within 72 hours of the rupture by surgical clipping or endovascular coiling and in accordance with our neuroscience unit protocol. We analyzed the presence of SVSP and recorded the timing of occurrence after the aneurysmal repair intervention. Data on demographics, premorbid conditions, time elapsed from the subarachnoid hemorrhage onset and intervention, and clinical and radiologic characteristics at admission were collected. The first occurrence of postintervention SVSP was recorded and compared between the 2 treatment groups using a proportional hazards regression model, including significant covariates. Of the 67 patients analyzed, 21 (31%) underwent endovascular coiling and 46 (69%) underwent surgical clipping. The baseline variables were similar in the 2 groups. The median time from the procedure to clinical vasospasm was 4 days in the coiled patients and 7 days in the clipped patients. In a proportional hazards model regression analysis including age, sex, Fisher and Hunt-Hess grades, time between onset to procedure, and intervention type, only intervention type emerged as a significant predictor of time to SVSP after intervention (likelihood ratio chi2 = 16.8; P < .00). Treatment modality of ruptured intracranial aneurysm may influence the timing of SVSP occurrence.

Systemic Hemostasis With Recombinant-Activated Factor VII Followed by Local Thrombolysis With Recombinant Tissue Plasminogen Activator in Intraventricular Hemorrhage

AbstractIntroduction: A 51-year-old woman on warfarin thromboprophylaxis for transient ischemic attacks developed sudden onset nausea, vomiting, and decreased mental status, rapidly becoming comatose. Head computed tomography (CT) showed intracerebral hemorrhage, extending into all ventricular chambers, and acute obstructive hematocephalus requiring urgent ventricular drainage. CT angiogram showed no evidence of an aneurysm or vascular malformation. Methods: The pretreatment international normalized ratio (INR) of 4.9 was rapidly corrected with recombinant activated factor VII and an external ventricular drain was placed. Despite accurate positioning, the ventriculostomy thrombosed and became nonfunctional. Recombinant tissue plasminogen activator was given intraventricularly and resulted in partial ventricular decompression within 24 hours, with dramatic improvement in the patient’s level of consciousness. Results: Repeated intraventricular fibrinolysis resulted in further reduction of the intraventricular hematoma within a few days and a good patient outcome. The patient did not require permanent ventricular shunt. Conclusion: To our knowledge, this is the first reported case of combined systemic enhancement of hemostasis and local fibrinolysis as a life-saving measure in intracranial hemorrhage.

SU-D-134-03: Design Considerations for a Dose-Reducing Region of Interest (ROI) Attenuator Built in the Collimator Assembly of a Fluoroscopic Interventional C-Arm

PURPOSE ROI fluoroscopy involves the use of an x-ray beam attenuator with higher attenuation in the periphery than the center thus allowing for dose reduction to the patient. This study presents the design considerations for placing an x-ray ROI attenuator made of copper inside the collimator assembly of an angiographic c-arm. METHODS The two important considerations for the design of the attenuator are the size of the ROI and the attenuation (and hence thickness of the material) needed outside the ROI. An attenuation of 80% outside the ROI, and none inside the ROI was assumed. To calculate the thickness, exposures were measured for different thicknesses of copper at various kVps and different inherent filtration of the system. Attenuation percentage was calculated from these readings and the thickness of copper was determined. The field-of-view (FOV) requirement depends on the type of procedure: smaller for a neurovascular intervention and larger for a cardiac procedure. An average FOV of 33% of 21cm × 21cm at 100cm SID with a circular ROI was assumed to calculate the diameter of the ROI in the attenuator. RESULTS For kVps ranging from 80 to 90, with an added filtration of 0.2mm copper, to get an average attenuation of 80%, 0.7mm of copper was needed for the thickness of the attenuator. The attenuator was placed 13cm from the focal spot and the diameter of the ROI at this distance was calculated to be 10mm. CONCLUSION The ROI attenuator can be mounted inside the beam limiting mechanism of the c-arm. This allows for the flexibility in the usage of this technique during fluoroscopic interventions, thus achieving patient-dose reduction. Since the attenuation for copper varies with varying kVp, different masks for different kVps are to be used for brightness equalization.

MRI assessment followed by successful mechanical recanalization of a complete tandem (internal carotid/middle cerebral artery) occlusion and reversal of a 10-hour fixed deficit

Mechanical clot extraction up to 8 hours after stroke onset is an alternative strategy for opening large vessels, especially for patients ineligible for intravenous thrombolysis. Safety beyond this therapeutic window is untested.

Paradoxical Brain Embolism From Thrombus Associated With Vena Caval Filter in a Patient With Cancer

A 71‐year‐old man experienced sudden onset of hemiparesis and aphasia. He had a 4‐month history of gallbladder cholangiocarcinoma, complicated with a postoperative deep‐vein thrombosis (DVT) that necessitated a vena caval filter placement. Diffusion‐weighted magnetic resonance imaging of the brain showed multiple hyperintense foci. Magnetic resonance spectroscopy was compatible with cerebral infarction. Abdominal computed tomography showed a thrombus in the inferior vena cava extending through the filters. A transcranial Doppler bubble study revealed the presence of a right‐to‐left shunt. Paradoxical cerebral embolism must be considered in patients with DVT who have new onset neurologic deficits even in the presence of a caval filter.