Browse Guides  internal medicine  neurology

Stroke

Prevalence
Clinical features
Investigations
Therapy
Prevention
Prognosis
Prognosis

Death

Many patients die b though the risk is lower with a minor stroke or TIA. a 
The risk of dying following a stroke is increased with: b  

  • increasing age 
  • drowsy or comatose at first examination 
  • fever or hypothermia on admission 
  • an elevated glucose on admission particularly if no known diabetes mellitus 

The risk of dying after 30 days is increased with  a

  • a previous TIA
  • pre-stroke functional disability 
  • a history of intermittent claudication
  • urinary incontinence 

The risk of dying following an ischaemic stroke is increased with:
  • increasing age a b
  • a severe a  or worsening stroke b  
  • atrial fibrillation a b  
  • ischaemic heart disease (particularly if an early onset) b or intermittent claudication b  
  • smoking a  
  • heart failure b 
  • an elevated glucose on admission a  
  • an elevated CRP (> 33 mg/dl) on admission a
  • urinary incontinence b  
  • unpartnered marital status b  
Use the following clinical prediction rule to determine your patient's risk of dying from an ischaemic stroke within 30 days. b

Score your patient for the following features

Clinical feature on admission b score
impaired consciousness 5
urinary incontinence 4
dysphagia 3
body temperature < 36.5°C 2
hyperglycaemia but no history of diabetes 2

Determine your patient's risk of dying

Score b % dead at 30 days
(95% CI)
11 or more 68%
(48% to 89%)
< 11 5.1%
(2.0% to 8.1%)

 

The risk of dying following a TIA or minor stroke is increased with: a  

  • increasing age a  
  • diabetes mellitus a  
  • atrial fibrillation a  
  • ischaemic heart disease a  or intermittent claudication a  
  • hypercholesterolaemia  a  
  • minor disability a,  including dysarthria a,  cranial nerve palsy a or limb weakness a  
  • seizures in hospital, or altered consciousness a
  • intraventricular haemorrhage  a  
  • vomiting a  
The risk of dying from an intracranial haemorrhage is increased with: a  
  • ventricular extension 
  • intracerebral haemorrhage volume ≥ 30 cm³ 
  • an initial GCS < 12

 

Deterioration

Many patients with stroke will get worse over the next few days b  
The risk of early deterioration is increased with: b  

  • posterior circulation stroke
  • reduced level of consciousness
  • hypertension
The risk of early deterioration following an ischaemic stroke is increased with a  
  • high systolic blood pressure at admission
  • carotid vascular territory involvement 
  • elevated initial glycaemia 
The risk of early deterioration following an intracranial haemorrhage is increased with a  
  • ventricular extension
  • intracerebral haemorrhage volume ≥ 30 cm³ 

 

Functional outcome

Patients with more severe strokes are less likely to be functionally independent a
Patients are less likely to have a good function outcome with: 
  • increasing age a b
  • atrial fibrillation  a  
  • a severe deficit  a b
  • bilateral or right-sided-stroke b
  • urinary incontinence a b
  • dysphagia b
  • pre-stroke institutionalisation a
  • no committed caregiver b
Nonetheless many patients return to work b  
Patients are more likely to return to work if they have: b
  • no apraxia 
  • normal muscle strength 
  • a desk job

 

Dementia

Many patients will develop dementia b  

 

Depression

Watch out for depression b
The risk of depression is increased with increasing age, and reduced with an active rehabilitation program. b  

 

Dysphagia

Swallowing problems are common. a  
A delayed or absent swallowing reflex on admission increases the risk of continued swallowing problems, a chest infection or aspiration. a  

Dysphagia, chest infection or aspiration are more likely with: a  

  • penetration of food
  • delayed oral transit
  • increasing age
  • male sex

Recurrence

Recurrent strokes are common a b though the risk is lower for patients with a TIA or minor stroke. a
The risk of recurrence is increased following an ischaemic stroke with: a  
  • increasing age b  
  • a prior stroke a  
  • diabetes mellitus a b  or elevated glucose levels on admission a  
  • hypertension at discharge a  
  • heavy alcohol use a  
  • a patent foramen ovale and atrial septal aneurysm a

The risk of a recurrent stroke following a TIA or minor stroke is increased with:  
  • increasing age a  
  • recurrent minor strokes or a lacunar stroke a  
  • diabetes mellitus a  
  • hypertension a  
  • a prior MI a  

Seizures

Watch out for seizures within the first few days a  
The risk is increased with:
  • a cortical involvement b  
  • an acute agitated confusional state b  
  • an anterior hemisphere infarct b  

A few patients will go on to have late seizures b  
The risk of seizures is increased with:

  • a haemorrhagic first stroke b  
  • seizure onset within 24 hours of stroke b
  • recurrent stroke b

The risk of status epilepticus is increased with

  • a poor functional status b

Urinary incontinence

Urinary incontinence is common initially, but settles in most patients. a
The risk is increased with a

  • old age
  • a subarachnoid haemorrhage
  • dysphagia
  • visual field defect
  • motor weakness

and reduced following a lacunar infarct. a

Expiry date: October 2003
Levels of Evidence used in grading these guides

Author   CM   Ball
Reviewer   G  Donnan
CAT Writers   CJ   Wotton , N   Shenker , CM   Ball