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CVA Emergency Management - Complete Drug Guide
Source: Rosen's Emergency Medicine, Chapter 87 (Stroke)
FIRST: IMMEDIATE STEPS FOR ALL CVA (Before Knowing the Type)
| Action | Target Time |
|---|
| Doctor sees patient | <10 min |
| CT scan completed | <25 min |
| CT read | <45 min |
| Treatment decision | <60 min ("door-to-needle") |
Initial stabilization (ALL stroke patients):
- ABC - Airway, Breathing, Circulation
- Oxygen - only if SpO2 <95%. Do NOT give routine oxygen to normoxic patients
- IV access - use Normal Saline (NOT dextrose - hyperglycemia worsens ischemic deficit)
- Blood glucose STAT - treat hypoglycemia immediately (it mimics stroke)
- ECG - identify AF or arrhythmias
- Non-contrast CT head STAT - to differentiate ischemic vs hemorrhagic
⚠️ You CANNOT give tPA until CT rules out hemorrhage
PART 1: ISCHEMIC STROKE
A. Blood Pressure Management
| Situation | Target BP | Drug |
|---|
| tPA candidate (before thrombolysis) | Must be <185/110 mmHg | Labetalol 10-20 mg IV over 1-2 min (repeat x1) OR Nicardipine 5 mg/h IV (titrate up by 2.5 mg/h q5-15 min, max 15 mg/h) |
| tPA candidate (after thrombolysis) | Maintain <180/105 mmHg | Same agents |
| NOT a tPA candidate | Do NOT lower BP unless >220/120 mmHg | Lower by only 15-20% in first 24h |
Rationale: Permissive hypertension maintains perfusion to ischemic penumbra. Aggressive BP lowering worsens outcomes.
Avoid in ischemic stroke: Sublingual nifedipine, aggressive IV nitroprusside
B. Thrombolysis - IV Alteplase (tPA)
ELIGIBILITY: Within 4.5 hours of symptom onset (or last seen normal)
Dose: Alteplase 0.9 mg/kg IV (maximum 90 mg total)
- 10% of total dose as IV bolus over 1 minute
- Remaining 90% as IV infusion over 60 minutes
Example: 70 kg patient = 63 mg total → 6.3 mg bolus + 56.7 mg over 60 min
Absolute Contraindications to tPA:
- Hemorrhage on CT
- Symptom onset >4.5 hours (or unknown onset)
- Prior intracranial hemorrhage ever
- Active internal bleeding
- Intracranial/spinal surgery in past 3 months
- Head trauma in past 3 months
- BP >185/110 mmHg (uncontrolled)
- Blood glucose <50 or >400 mg/dL
- INR >1.7, aPTT >40 sec, platelets <100,000
- NIHSS >25 (severe stroke - relative)
After tPA:
- No anticoagulants or antiplatelets for 24 hours
- Monitor BP every 15 min for 2 hours, then every 30 min for 6 hours, then every hour x 16 hours
- Watch for angioedema, symptomatic intracranial hemorrhage
C. Antiplatelet Therapy (if NOT a tPA candidate, or after 24h post-tPA)
| Drug | Dose | Notes |
|---|
| Aspirin | 325 mg orally within 24-48h of onset | First-line. Do NOT give within 24h of tPA |
| Aspirin + Clopidogrel (DAPT) | ASA 325 mg + Clopidogrel 75 mg | For minor stroke (NIHSS ≤3) or high-risk TIA - give within 24h, continue x 21 days |
| Clopidogrel | 75 mg daily | Alternative to aspirin if intolerant |
D. Anticoagulation (selected cases)
| Indication | Drug | Notes |
|---|
| Cardioembolic stroke (AF) | Heparin IV or LMWH | Typically delayed 24-48h to avoid hemorrhagic transformation |
| Cerebral venous sinus thrombosis (CVST) | UFH or LMWH | Even if hemorrhagic infarct present |
| Hypercoagulable state | Heparin | Individualized |
Routine heparin for all ischemic strokes is NOT recommended.
E. Glucose Management
- Treat hypoglycemia immediately: Dextrose 50% (D50W) 25-50 mL IV (if glucose <60 mg/dL)
- Treat hyperglycemia: Insulin sliding scale, keep glucose <180 mg/dL
- Avoid dextrose-containing IV fluids
F. Temperature
- Acetaminophen (Paracetamol) 650 mg PO/IV q6h for fever (target normothermia)
- Even minor hyperthermia worsens neurologic injury
G. Seizure (if occurs)
- Lorazepam 0.1 mg/kg IV (or Diazepam 0.15 mg/kg IV) for active seizure
- Prophylactic antiepileptics NOT recommended routinely in ischemic stroke
PART 2: HEMORRHAGIC STROKE (ICH / SAH)
Key Principle: The goals are OPPOSITE to ischemic stroke
- STOP the bleeding - reverse anticoagulation, lower BP aggressively
- NO tPA, NO anticoagulants, NO antiplatelets
A. Blood Pressure Management in ICH
| Target | Drug | Dose |
|---|
| SBP <140 mmHg (AHA/ASA guideline for most ICH) | Labetalol | 10-20 mg IV bolus q10-20 min, OR 2-8 mg/min IV infusion |
| Nicardipine | 5 mg/h IV, titrate by 2.5 mg/h q5-15 min, max 15 mg/h |
| Clevidipine | 1-2 mg/h IV, double q90 sec, max 21 mg/h |
| Enalaprilat | 1.25-5 mg IV q6h (use if LV dysfunction) |
| Hydralazine | 10-20 mg IV q4-6h (alternative) |
Avoid nitroprusside in increased ICP (increases cerebral vasodilation)
B. Reversal of Anticoagulation (URGENT in ICH)
| Anticoagulant | Reversal Agent | Dose |
|---|
| Warfarin (elevated INR) | Vitamin K + 4-Factor PCC (Kcentra) | Vitamin K 10 mg IV slow + PCC 25-50 units/kg IV (target INR <1.4). FFP 10-15 mL/kg if PCC unavailable |
| Heparin (UFH) | Protamine sulfate | 1 mg per 100 units of heparin given in last 2 hours (max 50 mg IV slow) |
| Enoxaparin (LMWH) | Protamine sulfate (partial reversal) | 1 mg per 1 mg enoxaparin if given <8h ago |
| Dabigatran | Idarucizumab (Praxbind) | 5 g IV (two 2.5 g vials) |
| Apixaban / Rivaroxaban | Andexanet alfa | Low dose: 400 mg bolus + 480 mg infusion; High dose: 800 mg bolus + 960 mg infusion |
| Antiplatelet agents (aspirin/clopidogrel) | Platelet transfusion (controversial) | 1 apheresis unit - only if going to surgery/life-threatening |
C. Intracranial Pressure (ICP) Management
| Drug | Dose | Indication |
|---|
| Mannitol | 0.5-1 g/kg IV over 20-30 min (20% solution) | Cerebral edema, herniation signs. Repeat q6-8h. Check serum osmolarity (stop if >320 mOsm) |
| Hypertonic Saline (3% NaCl) | 150-250 mL IV over 15-30 min | Alternative to mannitol, preferred if hypotension present. Target serum Na 145-155 mEq/L |
| Dexamethasone | NOT recommended in ICH | No benefit, increases infection risk |
D. Seizure Prophylaxis / Treatment in ICH
| Situation | Drug | Dose |
|---|
| Active seizure | Lorazepam | 0.1 mg/kg IV (max 4 mg), repeat once |
| Status epilepticus | Levetiracetam (preferred) OR Phenytoin | Levetiracetam: 1000-3000 mg IV loading dose |
| Prophylaxis (lobar ICH only, controversial) | Levetiracetam | 500-1000 mg IV/PO twice daily x 7 days |
Prophylactic phenytoin is NOT recommended in ICH (associated with worse outcomes)
E. Glucose and Temperature (same as ischemic stroke)
- Treat hypoglycemia: D50W IV
- Treat hyperglycemia: Insulin, keep glucose <180 mg/dL
- Treat fever: Acetaminophen 650 mg q6h. Active cooling if needed
F. Subarachnoid Hemorrhage (SAH) - Additional Drugs
| Drug | Dose | Purpose |
|---|
| Nimodipine | 60 mg PO q4h x 21 days | Prevents cerebral vasospasm (does NOT reverse it - only prevention). Do NOT give IV - causes severe hypotension |
| Dexamethasone | 4 mg IV q6h | Reduce meningeal irritation (controversial) |
| Levetiracetam | 1000 mg IV/PO twice daily | Seizure prophylaxis |
| Stool softeners (Docusate) | 100 mg PO twice daily | Prevent Valsalva / straining |
SUMMARY COMPARISON TABLE
| Feature | Ischemic Stroke | Hemorrhagic Stroke |
|---|
| CT appearance | Hypodense (after 6-12h) | Hyperdense (bright white) immediately |
| tPA | YES (if eligible, <4.5h) | ABSOLUTELY CONTRAINDICATED |
| Aspirin | Yes (after 24h) | NO (at least first 24h) |
| Anticoagulation | Selected cases only | Reverse it if on anticoagulants |
| BP target | Permissive (allow up to 220/120 if no tPA) | Aggressive (<140 systolic) |
| Mannitol/HTS | If edema/herniation | Yes for ICP control |
| Nimodipine | No | Yes in SAH only |
| Steroids | No benefit | No (harmful) |
QUICK EMERGENCY DRUG CHECKLIST
Ischemic: D50W (if hypoglycemic) → CT → tPA 0.9 mg/kg (if eligible) → Aspirin 325 mg (after 24h) → BP control if needed (Labetalol/Nicardipine to keep <185/110 for tPA) → Normal saline fluids → Treat fever (Paracetamol)
Hemorrhagic: CT → STOP all anticoagulants → Reverse anticoagulation (PCC/Vitamin K/Idarucizumab) → BP control aggressively (SBP <140) → Mannitol/HTS if herniation → Nimodipine (SAH only) → Levetiracetam (seizures)
Source: Rosen's Emergency Medicine, 9th Ed., Chapter 87 - Stroke