Adil Abbasi, MD FACP FSCN

Learning Objectives

• Define cerebrovascular accident (CVA) and distinguish ischemic stroke, hemorrhagic stroke, and transient ischemic attack (TIA).
• Review epidemiology, burden of disease, and major risk factors.
• Recognize common and uncommon clinical presentations of stroke.
• Understand emergency evaluation, diagnostic imaging, and acute management.
• Compare treatment approaches for ischemic and hemorrhagic stroke.
• Review complications, rehabilitation, secondary prevention, and prognosis.
• Apply principles through concept-check questions with detailed solutions.

Introduction

A cerebrovascular accident (CVA), commonly called stroke, is an acute neurological deficit caused by interruption of cerebral blood flow or rupture of a cerebral vessel, leading to brain injury. Stroke remains one of the leading causes of death and long-term disability worldwide. Rapid recognition and treatment are critical because millions of neurons may be lost each minute during untreated ischemic stroke.

Stroke is broadly divided into:

1. Ischemic Stroke – due to arterial occlusion causing reduced perfusion and infarction.
2. Hemorrhagic Stroke – due to rupture of intracranial blood vessels causing bleeding.
3. Transient Ischemic Attack (TIA) – brief focal neurological dysfunction without permanent infarction, but a major warning sign of future stroke.

The phrase “time is brain” summarizes the urgency of treatment.

Epidemiology and Burden

Stroke is among the most common neurological emergencies.

Aging populations and increasing rates of hypertension, diabetes, obesity, atrial fibrillation, and sedentary lifestyle contribute to rising stroke burden.

Types of Stroke

1. Ischemic Stroke: Accounts for approximately 80–87% of strokes. Caused by vessel occlusion.

Major Mechanisms

• Large artery atherosclerosis
• Cardio-embolism (e.g., Atrial Fibrillation)
• Small vessel (lacunar) disease
• Arterial dissection
• Hypercoagulable states
• Cryptogenic stroke

2. Hemorrhagic Stroke Includes:

Intracerebral Hemorrhage (ICH) - Bleeding into brain tissue.

Subarachnoid Hemorrhage (SAH) - Bleeding into subarachnoid space, often from ruptured  - aneurysm.

3.Transient Ischemic Attack (TIA): Temporary neurological deficit without persistent infarction. Symptoms usually resolve within minutes to hours.

Risk Factors

Nonmodifiable

• Advanced age
• Male sex (slightly higher earlier risk)
• Family history
• Prior stroke/TIA
• Certain ethnic/genetic predispositions

Modifiable

Clinical Presentations

Symptoms depend on vascular territory affected.

Common Findings

• Sudden unilateral weakness
• Facial droop
• Speech difficulty (aphasia/dysarthria)
• Numbness
• Vision loss or diplopia
• Ataxia
• Vertigo
• Severe headache (especially hemorrhage)
• Confusion
• Altered consciousness

FAST Recognition Tool

Stroke Syndromes by Territory

Diagnostic Workup

Immediate Priorities

• Airway, breathing, circulation
• Glucose check
• Time last known well
• Focused neurological exam
• NIH Stroke Scale

Key Investigations

Acute Management of Ischemic Stroke

Intravenous Thrombolysis

Eligible patients may receive IV thrombolytic therapy within accepted time windows after symptom onset if no contraindications exist.

Examples:

• Alteplase
• Tenecteplase

Mechanical Thrombectomy

For selected patients with large vessel occlusion, thrombectomy can dramatically improve outcomes.

Supportive Care

• Blood pressure management
• Fever treatment
• Oxygen if hypoxic
• Glucose control
• Swallow screen before oral intake
• DVT prophylaxis when appropriate

Acute Management of Hemorrhagic Stroke

Priorities

• Reverse anticoagulation if present
• Blood pressure control
• Neurosurgical consultation
• ICP management
• Seizure management when indicated

Examples of Surgical/Procedural Care

• Hematoma evacuation (selected cases)
• External ventricular drain
• Aneurysm clipping/coiling for SAH

Secondary Prevention After Ischemic Stroke

Common antiplatelets: Aspirin and Clopidogrel

Common anticoagulants (selected patients):

• Apixaban
• Rivaroxaban
• Warfarin

Complications

Rehabilitation

Stroke rehab should begin early when medically stable.

Disciplines Involved

• Physical therapy
• Occupational therapy
• Speech-language therapy
• Neuropsychology
• Nutrition
• Social work

Goals

• Mobility recovery
• ADL independence
• Swallow safety
• Communication restoration
• Cognitive compensation
• Home safety

Prognosis Depends on:

• Stroke size/location
• Age
• Initial severity
• Reperfusion success
• Complications
• Rehab intensity
• Comorbid disease

TIA predicts future stroke risk and warrants urgent evaluation.

Concept Check Questions

1. A patient develops sudden right facial droop and aphasia. Most likely hemisphere?

Answer: Left hemisphere often left middle cerebral artery territory because language centers are usually left-sided.

2. Why is non-contrast CT obtained first?

Answer: To rapidly exclude intracranial hemorrhage before thrombolysis.

3. Which arrhythmia strongly increases embolic stroke risk?

Answer: Atrial Fibrillation.

4. Why must swallow screening occur early?

Answer: To reduce aspiration risk and pneumonia.

5. A patient has “worst headache of life” with meningismus. Concern for?

Answer: Subarachnoid hemorrhage until proven otherwise.

Summary

• Stroke is a medical emergency requiring rapid diagnosis and treatment.
• Most strokes are ischemic; hemorrhagic strokes require different urgent management.
• FAST recognition saves brain tissue.
• CT head is first-line emergency imaging.
• Reperfusion therapy can improve outcomes in selected ischemic stroke patients.
• Prevention of recurrent stroke is essential.
• Rehabilitation strongly influences long-term recovery.

References

• American Heart Association. Stroke Guidelines.
• American Stroke Association. Acute Stroke Management Statements.
• World Health Organization. Global Stroke Burden Reports.
• Adams HP et al. Guidelines for early management of acute ischemic stroke.
• Powers WJ et al. 2019 Update to acute ischemic stroke guidelines.
• Greenberg SM et al. Guideline for spontaneous intracerebral hemorrhage.

Permissive Hypertension in Acute Ischemic Stroke

Learning Objectives

• Define permissive hypertension in acute ischemic stroke.
• Understand blood pressure targets with and without reperfusion therapy.
• Review duration of permissive hypertension.
• Identify commonly used IV antihypertensive agents when treatment is required.
• Recognize when transesophageal echocardiography (TEE) is indicated after stroke.
• Recognize indications for outpatient Holter/ambulatory rhythm monitoring after stroke or TIA.

Introduction: Permissive hypertension refers to the temporary acceptance of elevated blood pressure in the early phase of acute ischemic stroke to preserve perfusion to ischemic penumbra tissue. Cerebral autoregulation may be impaired after stroke, and aggressive lowering of blood pressure can worsen infarction.

This principle applies primarily to ischemic stroke, not hemorrhagic stroke.

Why Allow Higher Blood Pressure? In ischemic stroke, surrounding threatened tissue (penumbra) may depend on collateral circulation. Higher systemic pressure can help maintain cerebral perfusion until reperfusion occurs or autoregulation recovers.

Guideline Targets: Acute Ischemic Stroke

1. Patient NOT Receiving Thrombolysis or Thrombectomy

If no reperfusion therapy planned:

Generally, tolerate BP up to:

220/120 mmHg

Unless there are compelling reasons to treat.

If BP exceeds this, gradual reduction (about 15% in first 24 hours) is often recommended.

2. Patient Receiving IV Thrombolysis

Before Alteplase or Tenecteplase:

Must lower BP to:

<185/110 mmHg

After thrombolysis:

Maintain:

<180/105 mmHg for 24 hours

3. Mechanical Thrombectomy

BP targets vary somewhat by center, but commonly:

• Before procedure: often <185/110 
• After successful reperfusion: many centers target lower pressures (e.g., SBP <160 or individualized)

Duration of Permissive Hypertension

Typical Duration: First 24–48 hours after acute ischemic stroke.

Then gradual normalization depending on:

• Neurologic stability
• Infarct size
• Renal/cardiac status
• Chronic hypertension history
• Secondary prevention goals

Longer Than 48 Hours? Sometimes if:

• Large vessel stenosis with pressure-dependent symptoms
• Fluctuating deficits
• Ongoing hypoperfusion concerns
• Specialist-directed management

When to Avoid Permissive Hypertension / Treat Earlier

Drug of Choice When BP Must Be Lowered

Preferred IV Agents (Acute Stroke)

Often Practical First Choice

Labetalol

If quick intermittent control needed.

Nicardipine

If sustained infusion and tight titration needed.

Usually Avoid

• Sublingual nifedipine (unpredictable drop)
• Aggressive oral therapy in hyperacute phase
• Large sudden BP reductions

Restarting Home Antihypertensives

Usually after first 24–48 hours if stable, swallowing safe, and no perfusion concerns.

Indications for Transesophageal Echocardiogram (TEE) After Stroke

TEE is more sensitive than transthoracic echo for embolic sources.

Consider TEE When Cause of Stroke Unclear (Cryptogenic Stroke) especially younger age group or embolic-appearing stroke.

Major Indications

Often High Yield In

• Multiple vascular territory infarcts
• Cortical infarcts suggesting emboli
• Young stroke patient
• No carotid disease found
• No atrial fibrillation detected

Indications for Outpatient Holter / Ambulatory Cardiac Monitoring After Stroke

Used to detect occult paroxysmal Atrial Fibrillation.

Strong Indications

Best Yield

Longer monitoring detects more intermittent AF than 24-hour Holter.

Practical Inpatient-to-Outpatient Stroke Workup Flow

1. ECG in hospital
2. Telemetry during admission
3. If no cause found → TTE
4. If embolic suspicion persists → TEE
5. If no source yet → prolonged rhythm monitoring

Concept Checks

1. BP 205/110 in ischemic stroke, no thrombolysis planned. Treat immediately?

Answer: Often no immediate aggressive treatment needed because under 220/120 unless another emergency exists.

2. BP before alteplase is 192/114.

Answer: Must lower to <185/110 before thrombolytic therapy.

3. Normal TTE but embolic cortical stroke in 52-year-old.

Answer: TEE reasonable to evaluate PFO, left atrial appendage thrombus, aortic arch plaque.

4. Stroke with no cause after discharge.

Answer: Outpatient prolonged rhythm monitoring strongly considered.

Summary

• Permissive hypertension is mainly for acute ischemic stroke to preserve penumbra perfusion.
• If no reperfusion therapy: tolerate BP up to 220/120 in many patients.
• If thrombolysis planned: <185/110 before, <180/105 for 24 hr after.
• Typical duration: 24–48 hours.
• Preferred IV drugs: Labetalol, Nicardipine, Clevidipine.
• TEE is useful for cryptogenic or embolic stroke source evaluation.
• Outpatient Holter/extended monitoring is key to detect occult Atrial Fibrillation.

References

• American Heart Association / American Stroke Association Acute Ischemic Stroke Guidelines.
• Powers WJ et al. Guidelines for early management of acute ischemic stroke.
• Kernan WN et al. Secondary prevention of stroke guidelines.
• Sanna T et al. Cryptogenic stroke and prolonged rhythm monitoring.
• European Stroke Organisation guidance on blood pressure management after stroke.

Transient Ischemic Attack (TIA)

Adil Abbasi, MD FACP FACN

Learning Objectives

• Define transient ischemic attack (TIA).
• Understand short-term and long-term stroke risk after TIA.
• Identify high-risk clinical features requiring urgent evaluation.
• Review recommended inpatient and outpatient workup for TIA.
• Understand secondary prevention after TIA.
• Apply risk-stratification concepts in clinical practice.

Introduction

A transient ischemic attack (TIA) is a brief episode of focal neurological dysfunction caused by temporary cerebral, retinal, or spinal ischemia without persistent infarction. Symptoms usually resolve completely, often within minutes.

A TIA is a medical emergency because it frequently precedes a completed cerebrovascular accident (CVA). Many strokes occur in the hours to days after a TIA, making rapid recognition and treatment critical.

TIA should be viewed as a warning stroke.

Approximate Stroke Risk Without Prompt Treatment

Practical Interpretation for TIA within 48 hours:

• Low-risk TIA with rapid treatment: closer to ~1–3% 
• Untreated / high-risk TIA: can approach 8–10% or higher 
• Highest-risk features include:

• weakness or speech symptoms
• duration >1 hour
• recurrent TIAs
• carotid stenosis
• Atrial Fibrillation
• age >60
• Diabetes Mellitus
• uncontrolled Hypertension

With urgent ED/TIA clinic workup + immediate antiplatelet/statin/vascular management, the 48-hour risk can be substantially lowered compared with historical data.

Why Does Stroke Follow a TIA?

TIA often reflects an unstable vascular process such as:

• Carotid plaque rupture/embolization
• Atrial Fibrillation
• Intracranial stenosis
• Small thrombus with intermittent occlusion
• Hypercoagulability
• Arterial dissection

The same source may later cause a persistent arterial occlusion.

High-Risk Features After TIA

ABCD2 Score (Common TIA Risk Tool)

Higher score = higher early stroke risk.

Important Note

ABCD2 helps triage but does not replace imaging or specialist assessment.

Immediate Workup for TIA

Core Emergency Priorities

1. Confirm symptoms were vascular rather than mimic.
2. Identify high-risk source.
3. Prevent imminent stroke.

Diagnostic Workup for TIA

1. Brain Imaging

MRI is often more sensitive and may reclassify “TIA” as minor stroke.

2. Vascular Imaging

Urgent carotid imaging is essential if anterior circulation symptoms occurred.

3. Cardiac Evaluation

4. Laboratory Testing

TIA Mimics to Consider

Admit vs Outpatient Evaluation

Consider Admission If:

• Symptoms in past 24–48 hour
• Recurrent TIAs
• Persistent deficits
• High ABCD2 score
• Carotid stenosis suspected
• Atrial Fibrillation
• Unable to complete rapid outpatient workup

Outpatient TIA Clinic Reasonable If:

• Symptoms resolved
• Low-risk features
• Immediate imaging available
• Specialist follow-up within 24–48 hr

Secondary Prevention After TIA

Antiplatelet Therapy

Common agents:

• Aspirin
• Clopidogrel

Short-course dual antiplatelet therapy may be used in selected high-risk non-cardioembolic TIA patients.

If Atrial Fibrillation Found anticoagulation is often indicated:

• Apixaban
• Rivaroxaban
• Warfarin

Risk Factor Control

• BP management
• High-intensity statin
• Diabetes control
• Smoking cessation
• Exercise
• Weight optimization
• Sleep apnea treatment

Special High-Yield Scenario: Amaurosis Fugax

Transient monocular vision loss may represent retinal TIA and warrants urgent stroke workup.

Concept Check Questions

1. Why is TIA considered an emergency if symptoms resolved?

Answer: Because stroke risk is highest in the next hours to days, especially first 48 hours.

2. Most important vascular study after unilateral weakness and speech deficit?

Answer: Urgent carotid/neck vascular imaging (CTA, MRA, or carotid duplex).

3. ECG normal—does that exclude atrial fibrillation?

Answer: No. Paroxysmal Atrial Fibrillation may require telemetry or ambulatory monitoring.

4. MRI normal—can it still be TIA?

Answer: Yes. Many TIAs leave no infarct, though MRI may detect some small lesions.

Summary

• TIA is a warning sign for impending stroke.
• Stroke risk is highest in the first 24–48 hours.
• Rapid workup should include brain imaging, vascular imaging, ECG/rhythm monitoring, and labs.
• Search urgently for carotid disease and Atrial Fibrillation.
• Secondary prevention can dramatically reduce future stroke risk.
• Never dismiss resolved focal neurologic symptoms without evaluation.

References

• American Heart Association / American Stroke Association Guidelines for TIA and stroke prevention.
• Easton JD et al. Definition and evaluation of TIA.
• Kernan WN et al. Secondary prevention after stroke/TIA.
• European Stroke Organization TIA management guidance.