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Sedation Versus General Anesthesia for Endovascular Therapy in Acute Stroke - Impact on Neurological Outcome (ANSTROKE)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01872884
Recruitment Status : Completed
First Posted : June 7, 2013
Last Update Posted : October 11, 2017
Information provided by (Responsible Party):
Alexandros Rentzos, Sahlgrenska University Hospital, Sweden

Brief Summary:
The purpose of this study is to evaluate whether general anesthesia or sedation technique is preferable during embolectomy for stroke, measured in terms of three months neurological impairment. In addition we study if there is any difference between the methods regarding complication frequency.

Condition or disease Intervention/treatment Phase
Ischemic Stroke Drug: Sevorane Remifentanil Drug: Remifentanil Not Applicable

Detailed Description:

Stroke is a common cause of neurological disability. Early diagnosis of ischemic stroke now enables treatment with thrombolysis and / or endovascular therapy (embolectomy). In order to implement this procedure, the duration of which varies from 2-6 hours, the patient has to remain immobilized. Two techniques are currently used routinely to achieve this.

One technique is general anaesthesia, that will ensure that the patient is completely immobile throughout the procedure, which is an advantage from a neuroimaging perspective. A disadvantage is that preparation for, and the induction of anesthesia prolongs the time to embolectomy. Another disadvantage may be that the patient´s blood pressure drops during anesthesia, which could impair the brain blood supply and subsequently neurological outcome. The ability to evaluate the patient's neurological symptoms also disappears.

The second technique consists of sedation during surgery. The advantages of this technique are that the time to the beginning of embolectomy is getting shorter and the blood pressure becomes more stable. One drawback is that it cannot guarantee that the patient remains immobile throughout the procedure, which increases the risk of motion artifacts and may lead to the duration of embolectomy becomes prolonged. There is also a risk of hypoventilation and the patient aspirates during surgery.

Retrospective studies suggest that patients receiving general anesthesia have worse neurologic outcome three months after stroke. This could be explained by more or less pronounced anesthesia-induced episodes of hypotension, compared with lightly sedated patients with more stable blood pressure. In these retrospective analyzes, however, the patients who received general anesthesia were, neurologically speaking, more ill than patients who only received sedation. This may probably, at least in part, explain why anesthetized patients have a worse neurologic outcome. In these retrospective studies, many centers were involved, with various endovascular and anesthesia procedures.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 90 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Sedation Versus General Anesthesia for Endovascular Therapy in Acute Stroke - Impact on Neurological Outcome
Actual Study Start Date : November 14, 2013
Actual Primary Completion Date : September 30, 2016
Actual Study Completion Date : September 30, 2016

Arm Intervention/treatment
Experimental: General anaesthesia
General anaesthesia with mechanical ventilation. Sevorane Remifentanil. Bloodpressure control, systolic pressure 140-180 mmHg.
Drug: Sevorane Remifentanil
Sevorane Remifentanil
Other Name: tracheal intubation

Placebo Comparator: Sedation
Sedation with spontaneous breathing. Remifentanil. Bloodpressure control, systolic pressure 140-180 mmHg
Drug: Remifentanil
Other Name: Conscious sedation

Primary Outcome Measures :
  1. Neurological outcome in the two different arms [ Time Frame: 90 days ]
    Neurological outcome is measured as modified Rankin Scale (mRS), 90d post stroke.

Secondary Outcome Measures :
  1. NIHSS(National Institutes of Health Stroke Scale) [ Time Frame: Day 3,7,90 ]
    Change in NIHSS score on day 3, day 7 and 3 months compared to admission to hospital

  2. The degree of recanalization and reperfusion [ Time Frame: 1 day (After completed embolectomy) ]
    Measures as modified TICI(Thrombolysis In Cerebral Infarction)score

  3. Periprocedural complications [ Time Frame: Perioperatively ]
  4. Infarction magnitude [ Time Frame: Day 1 to Day 90 ]
    CT (computer tomography scan) Day 1 incl CTperfusion MR (magnetic resonance imaging) on day 3 (2-4) and 3 months Brain damage markers (GFAP, Tau, S-100B) before, 2, 24, 48, 72 hours and 3 months after the procedure.

  5. Quantitative EEG changes [ Time Frame: Day 1,2,90 ]
    Quantitative EEG (electro encephalography) days 1, 2, and three months after onset

  6. Time consumption [ Time Frame: Periprocedural ]
    Time consumed from: stroke onset to CT angiography, CT angiography to start of anesthesia / sedation, stroke onset to start of embolectomy and duration of embolectomy.

  7. Hospital length of stay [ Time Frame: Approximately 7-14 days ]
    Hospital length of stay

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:Patients with acute stroke considered for thrombectomy and meeting the following inclusion criteria included:

  1. the patient is ≥ 18 years
  2. the patient has a CT angio verified embolization * and / or a NIHSS scores ** ≥ 10 (R) or 14 (L) depending on the side engagement
  3. embolectomy (= groin puncture) started <8 hours after symptom onset

    • Embolus in one of the following arteries: internal carotid artery, anterior cerebral (A1 segment), cerebri media (M1 segment) and proximal cerebri media branches (M2 segment).

      • NIHSS (National Institutes of Health Stroke Scale). Patients with embolus in left hemisphere circulation require ≥ 14 points, while patients with embolus in the right hemisphere circulation require ≥ 10 points. This is because occlusion on the right side does not usually cause aphasia, a symptom that usually leads to higher total score of NIHSS.

Exclusion Criteria:

  1. the patient must receive general anesthesia, for medical reasons, according to the responsible anesthesiologist
  2. the patient cannot receive general anesthesia, for medical reasons, according to the responsible anesthesiologist
  3. the patient has an embolization of posterior brain vessels
  4. CT-confirmed intracerebral hemorrhage
  5. spontaneous recanalization or spontaneous neurological improvement
  6. any other reason that does not allow embolectomy (co-morbidities)
  7. premorbid MRS ≥ 4

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01872884

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Sahlgrenska University Hospital
Gothenburg, Sweden, S-413 45 Göteborg
Sponsors and Collaborators
Sahlgrenska University Hospital, Sweden
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Principal Investigator: Alexandros Rentzos, MD Diagnostic and interventional Neuroradiology, Radiology department, Sahlgrenska Academy, University of Gothenburg
Principal Investigator: Pia Löwhagen Henden, MD Anesthesiology, Sahlgrenska Academy, University of Gothenburg
Study Director: Sven-Erik Ricksten, MD PhD Prof Sahlgrenska Academy, University of Gothenburg
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Alexandros Rentzos, MD, Sahlgrenska University Hospital, Sweden Identifier: NCT01872884    
Other Study ID Numbers: ANSTROKE
ALFGBG-75870 ( Other Grant/Funding Number: Swedish State Support for Clinical Research (ALFGBG-75870) )
First Posted: June 7, 2013    Key Record Dates
Last Update Posted: October 11, 2017
Last Verified: October 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided
Keywords provided by Alexandros Rentzos, Sahlgrenska University Hospital, Sweden:
Ischemic stroke
Acute stroke
Endovascular therapy
Intra-arterial therapy
Additional relevant MeSH terms:
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Ischemic Stroke
Cerebrovascular Disorders
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Vascular Diseases
Cardiovascular Diseases
Analgesics, Opioid
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Platelet Aggregation Inhibitors
Anesthetics, Inhalation
Anesthetics, General