There are a lot of medical latin-sounding words used to describe the different stroke symptoms. Below is a list together with the way that I remember them.
In brackets is (Ph) or (M) to indicate whether the symptom is physical or mental. Physical could be movement or sensation; and Mental means cognitive processes such as perception or attention.
Around 40% of the brain is actually involved with vision, since it includes ocular motor movement, planning of these movements, receipt of the visual information, processing of it and then decisions made on the visual information – these decisions could be visuospatial, emotional etc.
Hemianopia (Ph) (hemi=half; plegia=paralysis)
Loss of vision in either L or R half of both eyes. So not loss of vision in left eye, but loss of left visual field in both eyes. The information from one side is not transmitted to the brain.
The information from eyes is being transmitted to the brain, but information for one side is ‘ignored’ or not processed by the brain.
Diplopia (Ph) (diplo=double; op=eye)
Continuous uncontrolled eye movements, seen with involuntary flickering movements of the eyes either L-R or up-down.
What is a stroke?
A stroke is similar to how a heart attack stops the blood going to the heart -but for the brain. So like a ‘brain attack’ or a sudden ‘strike’ to the brain. Depending where the blood is stopped from getting to in the brain, depends on what effect it’ll have on the person. Once deprived of blood and therefore oxygen, parts of the brain begin to die after only a few minutes and so a stroke is classed as a medical emergency.
Causes of stroke
Ischaemic– blood vessel blocked by clot, stopping flow. Most common 85% cases. Clot could be due to narrow arteries, clot in artery, or clot travelling from somewhere else to the brain. Brain area that dies is called an infarct… ‘the naughty clot “schemes” to injure the brain’
Haemorrhagic-blood vessel ruptures and blood leaks out. 15% cases. The leaking blood building up also causes extra pressure inside the skull. Leak could be due to high blood pressure or a weakened/bulging blood vessel wall (‘aneurysm’)…‘haemorrhage of blood’
Where the brain dies dictates which abilities will be lost. The right side of the brain controls the left side of the body, and vice versa.This means an injury to the left side will affect movement in the right side of the body.
The different areas of the brain control different tasks:
Frontal lobe (front)
- initiation and motivation
- voluntary movement
- appropriate socialising & interactions with others
- Broca’s area -produce spoken language
Parietal lobe (top middle strip: like saddle on a horse on the prairies, you experience a lot of unusual sensations as you ride through the desert like heat, smells, sore bum etc!)
- perception: processing sensation from touch/pressure/temp/pain
- Wernicke’s area-understand received language: spoken & written
Occipital lobe (back: why a blow to back of the head often affects vision)
- processing visual input from eyes
Temporal lobes (front either side:where your temples are located, a lot of old artefacts are stored (memory) and labelled (different things identified) in an old temple)
- distinguishing different smells & sounds apart
- visual & verbal memory (for words & names)
Cerebellum (bottom underneath, Latin for ‘little brain’)
- controls smooth (involuntary) muscles like gut or maintaining balance
Brain stem (stick at bottom, joining onto spinal cord)
- basic life support functions eg breathing, heart