BP Management Guidelines in Acute Stroke

Why High BP Is "Allowed" in Acute Stroke

• Comprehensive Clinical Nephrology, 7th Ed.

1. Acute Ischemic Stroke (AIS) - NOT a Reperfusion Candidate

• Early treatment is also indicated if hypertension is required by a comorbid condition (acute coronary syndrome, aortic dissection, hypertensive encephalopathy, preeclampsia/eclampsia).
• Do not lower SBP by more than 15% in the first 24 hours - this is a hard rule.
• Tintinalli's Emergency Medicine, 9th Ed.; Frameworks for Internal Medicine

2. AIS - Candidate for IV Thrombolysis (tPA/alteplase)

• Labetalol 10-20 mg IV over 1-2 min; may repeat once
• Nicardipine 5 mg/h IV infusion; titrate by 2.5 mg/h every 5-15 min; max 15 mg/h
• Clevidipine 1-2 mg/h IV; double dose every 2-5 min; max 21 mg/h
• Nitroprusside - reserved for refractory cases or DBP > 140 mmHg

3. AIS - After Successful Mechanical Thrombectomy (MT)

• Do NOT intensively lower SBP below 140 mmHg in the first 24 hours after successful thrombectomy.
• This is now a high-certainty evidence recommendation from the 2025 ESO guideline update.
• Vasopressors to raise BP in AIS patients with neurological deterioration who are not receiving reperfusion therapy are also discouraged (low-certainty evidence).

4. Intracerebral Hemorrhage (ICH)

• Labetalol IV bolus or continuous infusion
• Nicardipine IV continuous infusion
• Esmolol IV bolus then infusion (data suggest aggressive control to SBP 130-139 at 6h may reduce hematoma growth)

5. Aneurysmal Subarachnoid Hemorrhage (SAH)

Summary Table

Key Principles

1. Never treat permissively elevated BP in AIS without a specific reason - the penumbra depends on it.
2. The 15% rule applies to non-reperfusion AIS: maximum reduction is 15% in 24h.
3. Thrombolysis changes everything - you must hit < 185/110 before giving tPA.
4. ICH target is SBP 140 for mild-moderate hemorrhages; avoid over-lowering if ICP is elevated.
5. Labetalol, nicardipine, and clevidipine are the preferred IV agents across all acute stroke types; nitroprusside is a backup.
6. The 2025 ESO guideline update (Sandset et al., Eur Stroke J, 2026) is the most current authoritative reference and reaffirms these core targets while noting that most evidence remains moderate-to-low certainty.

BP Reduction Guidelines in Acute Ischemic Stroke - NOT a Thrombolysis Candidate

Core Principle: Permissive Hypertension

• The ischemic penumbra (viable brain tissue surrounding the infarct core) depends on collateral perfusion pressure.
• Cerebral autoregulation is impaired - cerebral blood flow becomes passively dependent on systemic BP.
• A fall in BP reduces flow to the penumbra and extends the infarct.
• BP also tends to fall spontaneously over the first 1-3 days post-stroke.
• Multiple trials and a 2025 meta-analysis (Yuan et al., Int J Stroke) confirmed that prehospital BP lowering in ischemic stroke was associated with worse functional outcome (OR 1.27) and increased 90-day mortality (OR 1.28).

"Aggressive lowering of BP has been associated with neurologic deterioration." - Washington Manual of Medical Therapeutics

AHA/ASA Guideline (Non-tPA Candidates)

• Comprehensive Clinical Nephrology, 7th Ed. - Table 41.3; Washington Manual of Medical Therapeutics

ESO Guideline

• Routine BP lowering is NOT recommended in AIS.
• Cautious BP lowering is considered only in patients with extremely high BP (> 220/120 mmHg) on repeated measurements, or with severe cardiac failure, aortic dissection, or hypertensive encephalopathy.
• Abrupt BP lowering should always be avoided.
• Comprehensive Clinical Nephrology, 7th Ed. - Table 41.3 (ESO column)

When to Treat Regardless of BP Value

1. Acute coronary syndrome (ACS)
2. Congestive heart failure (CHF)
3. Hypertensive encephalopathy - distinguish from stroke: encephalopathy = global dysfunction + papilledema; stroke = focal deficit
4. Aortic dissection
5. Preeclampsia / eclampsia

Preferred IV Agents

• Tintinalli's Emergency Medicine, 9th Ed.

Note: Be cautious in patients on chronic oral beta-blockers or clonidine - antihypertensive withdrawal syndrome can occur.

Advantages vs. Risks of Treating BP in Non-tPA AIS

• Comprehensive Clinical Nephrology, 7th Ed. - Table 41.1

What Happens After 24 Hours?

• After 24 hours, if the patient is neurologically stable, antihypertensive therapy can be restarted or initiated, especially for secondary stroke prevention.
• The long-term BP target for secondary prevention is < 130/80 mmHg (AHA/ASA 2021).
• If the patient was on antihypertensives before the stroke, guidelines generally recommend continuing or cautiously restarting them after the acute phase (not during the acute 24-hour window).

Summary in One Sentence

Nodosis 2g Sachet - How to Take

Step-by-step instructions:

1. Empty the sachet into a cup or glass.
2. Add water (about half a glass, ~100-150 mL of plain water at room temperature). Do not use hot water.
3. Stir well until the powder is fully dissolved.
4. Drink the entire solution immediately - do not let it sit.

Key points:

• Active ingredient: Sodium bicarbonate (an antacid/alkalinizing agent).
• When to take: With or without food - but it is often taken when symptoms of acidity, heartburn, or indigestion occur. Taking it after meals is also fine.
• Frequency: Usually 1 to 4 times a day, or as directed by your doctor.
• Can be taken with or without food.

Important cautions:

• Heart patients / high sodium diet: Use with caution - sodium bicarbonate has high sodium content and can worsen fluid retention.
• Kidney disease: Dose adjustment may be needed - consult your doctor.
• Do not combine with other antacids unless advised.
• Avoid alcohol while taking it - alcohol increases stomach acid production.
• Not recommended for children unless prescribed.