Stroke:An Introduction

Posted by e-Medical PPT
What is a Stroke? (Brain Attack)
Disruption of blood flow to part of the brain caused by:
Occlusion of a blood vessel (ischemic stroke)
OR
Rupture of a blood vessel (hemorrhagic stroke)

What happens with cutoff of blood supply?
Oxygen deprivation to nerve cells in the affected area of the brain -->
 Nerve cells injured and die -->
 The part of the body controlled by those nerve cells cannot function.

What happens with rupture of a blood vessel?
Oxygen deprivation to nerve cells in the affected area of the brain and local destruction of nerve cells-->
 Nerve cells injured and die -->
 The part of the body controlled by those nerve cells cannot function.

Stroke Impact
750,000 strokes per year
Third leading cause of death
(1st: heart disease, 2nd: all cancers)
Over 160,000 deaths per year
Over 4 million stroke survivors

Stroke Diagnosis
Symptoms of Stroke
Sudden numbness or weakness of face, arm or leg, especially on one side of the body
Sudden confusion, trouble speaking or understanding
Sudden trouble seeing from one or both eyes
Sudden unsteadiness, dizziness, loss of balance or coordination
Sudden severe headache with no known cause

Common Stroke Patterns
Left (Dominant) Hemisphere:
Aphasia
Right hemiparesis
Right hemisensory loss
Right visual field defect
Left gaze preference
Dysarthria
Difficulty reading, writing, or calculating

Right (Nondominant) Hemisphere:
Left hemiparesis
Left hemisensory loss
Left neglect
Left visual field defect
Right gaze preference
Dysarthria

Brainstem/Cerebellum/Posterior Circulation
Motor or sensory loss in all 4 limbs
Crossed signs (face vs. body)
Limb or gait ataxia
Dysarthria
Dysconjugate gaze
Nystagmus
Amnesia
Cortical blindness

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