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Acute Stroke Protocol

Purpose: To provide guidance in the care of an Acute Ischemic Stroke patient

Application: For all potential acute ischemic stroke patients presenting with Last Known Well less than 6 hours

Exceptions: Patients who present with stroke symptoms greater than 6 hours

Procedure: a tPA Guideline: Acute Ischemic Stroke


This protocol was developed by the Stroke Service and members of the Stroke Taskforce at Boston Medical Center and outlines the major responsibilities for the urgent evaluation and treatment of acute stroke patients who present to the ED.

This information is intended to be used only as a medical and educational reference tool. It does not replace or overrule the treating physician's judgment or diagnosis. We tried to keep the information as accurate as possible and therefore disclaim any implied warranty or representation about its accuracy or appropriateness for a particular purpose. This stroke protocol is subject to change without notice.


Emergency Department Stroke Care Process Measure Assessment Tool

Activity Time Targets
Door to notification of Acute Stroke Team (AST), i.e., making the call to the team* within 5 minutes of arrival
Time from notification of AST to response of team member by phone or at patient bedside to assess patient* within 5 minutes of being called
Door to CT scan or MRI scan within 25 minutes
Door to CT result within 45 minutes
Door to completion of chest X-Ray and interpretation within 45 minutes
Door completion of ECG and interpretation within 45 minutes
Door to completion of labs and results/interpretation within 30 minutes
Results (labs, CT) to tPA decision time* Within 10 minutes
ED door-to-needle time for IV thrombolytic (t-PA) treatment within 45 minutes
Time from order of neurosurgical evaluation to start of evaluation; includes transfer to another hospital for such evaluation, if applicable within 2 hours of being deemed clinically necessary
Neurosurgical intervention as needed urgently

* DPH stroke care recommendations modified for BMC.

NOTE: Complete tPA consent form to patients who will receive tPA in the 3-4.5 hour window and give information sheet to patient.

Intravenous tPA in Acute Ischemic Stroke
Approved FDA use for LESS than 3.0 hours from initial symptoms
Off-label use for 3 to 4.5 hours (see additional warnings below)

A. Indications

  • New symptomatic ischemic stroke with clearly defined Last Known Well < 3 hours
  • Age 18 or more
  • Patient evaluated by in-house neurology fellow or resident, and tPA approved by stroke fellow or ED attending (via phone or in person)

B. Contraindications

  • CT scan findings of intracranial hemorrhage or major acute infarct (>1/3 cerebral hemisphere)
  • Suspicion of subarachnoid hemorrhage (even if head CT is negative for hemorrhage)
  • Significant head trauma or prior stroke in previous 3 months
  • Recent intracranial or intra-spinal surgery
  • History of previous intracranial hemorrhage or brain aneurysm, vascular malformation or brain tumor
  • Arterial puncture at non-compressible site in previous 7 days
  • Known bleeding diathesis OR
    1. Current use of oral anticoagulants with INR > 1.7 or PT  and > 15 seconds
    2. Use of heparin within 48 hours preceding onset of stroke AND prolonged aPTT at time of presentation. Low molecular weight heparin use (i.e.- Lovenox) in the past 24 hours.
    3. Platelets < 100,000
    4. Active internal hemorrhage
    5. Novel oral anticoagulant use in the past 48 hours (if last dose > 48 hours, confirm normal renal function [creatinine clearance > 50 mL/min] and normal coagulation [aPTT, INR, platelet count, thrombin time or appropriate factor Xa activity assays] before tPA administration) See Addendum A
  • Persistent systolic BP >185 mm Hg or diastolic BP > 110 mm Hg despite treatment.
  • Blood glucose concentration < 50 mg/dl

Patients treated within 3-4.5 hour window warnings/contraindications

Age > 80
Any anticoagulant use
History of Stroke AND Diabetes

C. Warnings (risks must be weighted against anticipated benefits)

  • MI within last 3 months (with normal TTE)
  • Current use of oral anticoagulants with INR >  1.5 or PT  > 15 seconds
  • Major surgery or serious trauma within previous 2 weeks
  • Minor neurological deficit or rapidly improving symptoms (see Addendum B)
  • High likelihood of left heart thrombus
  • Aortic dissection
  • Severe neurological deficit (NIH stroke scale score > 22)
  • Seizure at symptom onset
  • History of IVDU and/or suspicion for endocarditis
  • Tox-screen positive for ETOH, cocaine, opiates, or amphetamines (if available, but should not delay tPA protocol)
  • Subacute bacterial endocarditis
  • Acute pericarditis
  • History of hemorrhagic diabetic retinopathy
  • Significant hepatic dysfunction with abnormal INR
  • Pregnancy
  • Sickle cell disease
  • Internal hemorrhage (e.g., GI or urinary tract) < 3 weeks
  • Blood glucose < 50 mg/dL

D. Not a contraindication

  • Current aspirin, NSAID or antiplatelet drugs (dipyridamole, ticlopidine, clopidogrel)
  • History of PUD (not currently active [>3 months])

E. For those patients presenting with a suspected stroke to the Emergency Room

  1. EMT/Triage: alert EM-MD and stroke fellow (pager 1620) –Activate Level 2 of Stroke Alert pager
  2. Patient is transferred/assigned to the Trauma Room or Acute Side
  3. EM/MD: ORDER STAT HEAD-CT (non-contrast enhanced) AND STAT STROKE-CONSULT [if NIHSS > 6, order STAT CTA for patients who could be candidates to bridge from iv tPA to intra-arterial intervention- DO NOT DELAY tPA TO COMPLETE THE CTA] If the patient has a significant neurological deficit (ie NIHSS > 6) and/or CTA demonstrates proximal vessel occlusion, the neurointerventional team should be activated early (pager 2645 or COIL)
  4. RN/MD:
    • Establish 2 IV sites, including stat 18 gauge antecubital IV for CTA (ideally on right), start 0.9% NS 250- 500 cc bolus followed by NS @ 80 cc/hour
    • Cardiac monitor, pulse oximeter, continuous vital signs
    • 12 lead EKG and CXR after CT – unless experiencing chest pain
    • Clinical evaluation for active illicit drug use (toxicology screen) or ETOH intoxication
    • Obtain patient weight early
    • Notify pharmacy early regarding potential tPA preparation.
  5. STAT Labs: PTT, INR, CBC (without diff.), electrolytes, BUN, creatinine, CK & troponin, glucose, type & hold. Call Hematology lab to notify this is a stroke patient, place stroke stickers on tubes.
  6. t-PA is approved by stroke attending or ED attending and Stroke Fellow. ED attending MUST be notified if tPA is going to be given
  7. Admit to ICU

F. For those patients with a suspected stroke while hospitalized

  1. Activate the Acute Stroke Team (1620); Page Rapid Response Team.
  2. Stat bedside glucose
  3. 3. Stat Head CT, CTA if NIHSS > 6
  4. Place order for IV tPA- notify Pharmacy
  5. Order stat blood tests: PTT, INR, CBC (without diff.), electrolytes, BUN, creatinine, CK & troponin, glucose, type and hold
  6. t-PA approved by stroke attending. tPA can be given by the Stroke Service, CCRN, ICU nurse, or ED nurse.
  7. Transfer patient to ICU
  8. RN/MD (as above)
    • Establish 2 IV sites, including stat 18 gauge antecubital for CTA, start 0.9% NS 250 cc bolus followed by NS @ at 80 cc/hour
    • Cardiac monitor, pulse oximeter, monitor vital signs
    • If patient is candidate for IA intervention, IR attending will consider foley catheter

G. Once tPA has been started

  • Do not perform for 24 hours post tPA unless procedure is life-saving: Arterial or central venous punctures/lines, IM injections, nasogastric tubes, Foley catheters
  • Place the patient on anticoagulation precautions until 24 hours after the infusion
  • Do not give any antithrombotic drugs (including heparin, warfarin, aspirin, clopidogrel, dipyridamole, ticlopidine, or NSAIDS) x 24 hrs

H. Administration

  • The stroke fellow will utilize a phone consultation with the stroke attending prior to administering IV tPA
  • Administer tPA in monitored setting (unit bed or emergency room) Bolus may be given in CT and on floor for in-house strokes as long as critical care or resource nurse present
    • Mix a 100 mg tPA vial with 100 cc NS- 1cc=1mg
    • Estimate total body weight (if not measured on admission)
    • Calculate TOTAL tPA DOSE: 0.9 mg per kg (not to exceed 90 mg total dose)
      • Give 10% as IV bolus over 1 minute
      • Give other 90% as IV infusion over 60 minutes – infuse 50 cc NS after dose to flush medication
    • Vital signs and neurochecks at least every 15 min for first 2 hours, including NIHSS scores, which must be documented in Epic note
    • Treat systolic BP if it rises to &gt;180 mm Hg or diastolic BP &gt;105 mm Hg for more than 15 minutes Pause infusion while BP is being controlled.
    • Avoid BP decrease < 160/ 85 mm Hg

t-PA Dosing (estimated weight)

Estimated Weight (lbs) Conversion to Kilograms (Kg) Total iv t-PA Dose (mg) at 0.9 mg/kg t-PA Bolus (mg) *10% of total* t-PA Bolus (ml) Discard Dose t-PA (Not for infusion) Infusion Dose (mg) Infusion Rate (ml/hr)
220+ 100.0 90.0 9.0 9.0 10.0 81.0 81.0
210 95.5 85.9 8.6 8.6 14.1 77.3 77.3
200 90.9 81.8 8.2 8.2 18.2 73.6 73.6
190 86.4 77.7 7.8 7.8 22.3 70.0 70.0
180 81.8 73.6 7.4 7.4 26.4 66.3 66.3
170 77.3 69.5 7.0 7.0 30.5 62.6 62.6
160 72.7 65.5 6.5 6.5 34.5 58.9 58.9
150 68.2 61.4 6.1 6.1 38.6 55.2 55.2
140 63.6 57.3 5.7 5.7 42.7 51.5 51.5
130 59.1 53.2 5.3 5.3 46.8 47.9 47.9
120 54.5 49.1 4.9 4.9 50.9 44.2 44.2
110 50.0 45.0 4.5 4.5 55.0 40.5 40.5
100 45.5 40.9 4.1 4.1 59.1 36.8 36.8

I. Monitoring:

  1. Admit to ICU and monitor patient in ICU for a minimum of 24 hours.
    • Unless the patient is unstable, notify ED attending and bed control RN that patient should be admitted to the neurocritical care service in the neuro-ICU (ENC 3 West). The patient will be co-managed by the MICU service. Patients undergoing acute endovascular or surgical treatment will be admitted to the HAC SICU. The ED Neurology resident must sign out to the appropriate admitting ICU resident
  2. Blood pressure monitoring:
    1. During the first 24 hours after tPA, monitor BP:
      • Every 15 minutes for 2 hours after starting the infusion, then
      • Every 30 minutes for 6 hours, then
      • Every 60 minutes until 24 hours after starting treatment
  3. If systolic blood pressure is > 180 mmHg or if diastolic blood pressure is &gt;105 mmHg for 2 or more readings 5 to 10 minutes apart, the following is recommended:
    1. First tier intervention: Give IV labetalol 10 mg over 1 to 2 minutes. Labetalol may be repeated up to 3 doses every 10 to 20 minutes (doubling doses if needed depending on effect of preceding dose; eg. 1st dose-10mg, 2nd dose- 20mg, 3rd dose- 40mg, then consider drip)
      • For heart rate&lt;60/minute, use hydralazine 5-20mg intravenous over 1-2 minutes every 20-30 minutes. After second bolus, consider second line intervention.
      • Monitor blood pressure and neurologic exam every 15 minutes during treatment and observe for development of hypotension for all 3 tiers of BP interventions.
    2. Second tier intervention: If 3 doses of labetalol or hydralazine bolus or 30 minutes pass without sufficient BP control, the next step should be a nicardipine drip.
    3. Third tier intervention: If nicardipine drip fails, then the next step should be a labetalol drip.
      **To avoid worsening of cerebral ischemia, target BP of 155-175/85-100.
  4. Use 0.9% NS only, as needed (avoid hypotonic solutions). Initiate fluid hydration in the ED with 250-500 cc bolus followed by 80 cc per hour, except in those patients who have a contraindication (pulmonary edema, renal failure, known CHF)
  5. Further management as directed by the neurocritical care service.


Considerations for patients on novel oral anticoagulants (NOACs):


Rivaroxaban (Xarelto)

Apixaban (Eliquis)

Dabigatran (Pradaxa)


Factor Xa inhibitor

Factor Xa inhibitor

Direct thrombin inhibitor

Typical dose for Afib

20mg daily

5mg BID

150mg BID

Onset of action

3-4 hours

3-4 hours

0.5-2 hours

Half life

5-9 hours

12 hours

12-17 hours


Anti-factor Xa levels*

Anti-factor Xa levels*


Reversal agents

Consider PCC**

Consider PCC**

Dialysis; consider PCC**

  • *Limited monitoring of NOACs available by the following means:
    • Rivaroxaban: PT and aPTT are prolonged in a dose-dependent manner with 1-4 hours after administration of rivaroxaban. Increase is short-lived and at therapeutic levels, rivaroxaban will NOT reliably elevate PT/aPTT. Antifactor Xa levels must be specifically calibrated for Factor Xa inhibitors and are assay specific. This is a send-out test that takes at least 5-6 days to result.
    • Apixaban: PT/aPTT are insensitive. Antifactor Xa levels must be specifically calibrated for Factor Xa inhibitors and are assay specific. This is a send-out test that takes at least 5-6 days to result.
    • Dabigatran: a normal aPTT excludes the presence of a significant amount of dabigatran but degree of aPTT isn’t correlated with degree of coagulopathy (non-linear dose response curve, plateaus at higher concentrations).
  • **There is no evidence-proven effective reversal agents for NOACs. In the setting of serious or life-threatening bleeding, PCC can be used at a dose of 50 unites/kg. Note: see BMC policy for Reversal of Anticoagulation in Adults for complete information.
    • Rivaroxaban: Evidence suggests that PCC may be effective for reversal.
    • Apixaban: PCC has not yet been studied for reversal of Apixaban.
    • Dabigatran: Evidence suggests that PCC is not effective for dabigatran reversal. Because dabigatran is primarily renally excreted, dialysis of 2-3 hours can remove 60% of the circulating drug.

B. Considerations in patients with minor symptoms (NIHSS &lt;4)

  • Patients with minor symptoms (NIHSS &lt;4) may still benefit from tPA, especially if the symptoms are likely to be debilitating (hand weakness, aphasia, visul field deficit, etc.)
  • Several studies have reported that approximately 1/3 of patients who are not treated with tPA because of mild or rapidly improving stroke symptoms on hospital arrival have a poor final stroke outcome.

C. Treatment of patients who sustain a hemorrhage soon after IV t-PA administration

  • STAT Hematology consult
  • In addition to standard labs, check fibrinogen
  • Cryoprecipitate 10 units
  • Consider aminocaproic acid or tranexamic acid
  • Consider platelet transfusion (6-8 units)
  • Consider FFP transfusion

Responsibility: MD, RN, Radiologist, radiology tech, Lab, Pharmacy

Forms: tPA consent, tPA information sheet, IR consent

Other Related Policies: IA Stroke Protocol,


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