What Is a Stroke? An Australian Guide

What is a stroke? An Australian guide

Someone in Australia has a stroke every nineteen minutes.

That figure comes from the Stroke Foundation’s No Postcode Untouched report, which counted 27,428 new strokes in 2020 and projected roughly 50,600 a year by 2050 — one every ten minutes — if nothing changes. There are currently around 445,087 Australians living with the effects of a stroke, a number expected to reach 819,900 by 2050.

Those numbers get quoted a lot. What gets quoted far less is the one underneath them: 10,670 of the 2020 strokes happened to Australians of working age, roughly 39% of the total, and around a quarter of strokes that year occurred in people aged 54 or younger. Stroke incidence is rising specifically in Australians aged 35 to 54.

That matters enormously for how this guide is written, because the public image of stroke is an elderly person in a nursing home, and a very large share of Australian stroke survivors are people in their forties and fifties with mortgages, jobs and school-age children.

This guide covers what a stroke actually is, what happens in the hours and weeks afterwards, and what the Australian picture really looks like.

What happens in a stroke

The brain uses about a fifth of the body’s oxygen and has essentially no reserve. Interrupt the blood supply to part of it and that part starts dying within minutes.

There are two mechanisms, and they are opposites.

Ischaemic stroke — around 80% of strokes — is a blockage. A clot forms in an artery supplying the brain, or travels there from elsewhere (most often from the heart, in atrial fibrillation) and lodges in a vessel too narrow to pass. Everything downstream is starved.

Haemorrhagic stroke is a bleed. A vessel ruptures, either within the brain tissue itself (intracerebral haemorrhage) or into the space around the brain (subarachnoid haemorrhage, often from a ruptured aneurysm). Blood is directly toxic to brain tissue and the accumulating volume raises pressure inside a fixed skull. Haemorrhagic strokes are less common but carry higher early mortality.

Transient ischaemic attack (TIA) is a blockage that clears on its own, producing stroke symptoms that resolve — classically within an hour, and by definition within 24 hours, without lasting damage on imaging.

A TIA is not a lesser event. It is a warning, and the risk of a full stroke in the days immediately afterwards is substantial. The phrase “mini-stroke” does real harm here, because it sounds like something you can mention to your GP next week. A TIA is an emergency and should be treated as one, even though the symptoms have gone.

Why the location decides everything

This is the single most useful concept for understanding why two stroke survivors can have nothing in common.

Brain function is localised. What a stroke does depends almost entirely on which territory lost its blood supply, not on how “big” the stroke was in some general sense.

A stroke in the left hemisphere’s language areas produces aphasia — difficulty producing or understanding language — usually with weakness on the right side of the body, because motor pathways cross. A stroke in the right hemisphere more often produces hemispatial neglect, where a person is unaware of one side of space, along with left-sided weakness. A brainstem stroke can affect swallowing, eye movement, balance and consciousness while leaving language and reasoning entirely intact. A cerebellar stroke produces incoordination and vertigo. Small vessel (lacunar) strokes can cause pure motor weakness with no cognitive change at all.

So “how bad was the stroke?” is not really answerable. A small stroke in the wrong place is devastating. A larger one elsewhere may leave very little.

Recognising it: F.A.S.T., and what it misses

The Australian public health message is F.A.S.T.:

• Face — has their mouth drooped?
• Arms — can they lift both arms?
• Speech — is it slurred? Do they understand you?
• Time — time is critical. Call 000 immediately.

F.A.S.T. is genuinely good and it saves lives, because it captures the most common presentations in a form people remember.

It is also incomplete, and knowing what it misses is worth something. Strokes that do not involve face, arm or speech include: sudden loss or blurring of vision in one or both eyes; sudden severe dizziness, loss of balance or difficulty walking; sudden numbness anywhere on one side; sudden confusion; and — the classic subarachnoid haemorrhage presentation — a sudden, severe headache unlike any previous headache, often described as a thunderclap.

Posterior circulation strokes in particular are frequently missed, both by the public and in emergency departments, because dizziness and unsteadiness get attributed to inner ear problems.

The rule worth carrying: sudden onset of any neurological symptom is a stroke until proven otherwise. Sudden is the word doing the work. Stroke symptoms arrive in seconds to minutes, not over days.

Call 000. Do not drive the person yourself. Ambulances pre-notify the hospital and route to stroke-capable centres, and that pre-notification saves time that cannot be recovered later.

Why minutes matter so much

Treatments for ischaemic stroke are time-limited in a way that few medical treatments are.

Thrombolysis — a clot-dissolving drug given intravenously — works within a narrow window from symptom onset, generally up to four and a half hours, with benefit falling steeply the longer it takes.

Endovascular thrombectomy — physically retrieving the clot with a catheter threaded up from the groin — has transformed outcomes for large vessel occlusions and has a somewhat longer window in selected patients, but the same principle holds.

Both depend on knowing when symptoms started, which is why the first question in the emergency department is always “when was the person last seen well?” If someone wakes with symptoms, the clock runs from when they went to bed. This is also why strokes that occur during sleep are harder to treat.

Haemorrhagic stroke is managed differently — blood pressure control, reversing anticoagulation, sometimes neurosurgery — and thrombolysis would be catastrophic, which is why the CT scan comes before any treatment.

The Australian picture

Some numbers worth knowing, all from the Stroke Foundation’s national reporting.

Stroke is not evenly distributed. Regional Australians are 17% more likely to have a stroke than people in major cities, and access to stroke units is sharply unequal: 61 stroke units in major cities, 25 in inner regional areas, and 5 in outer regional areas. Education about preventing a second stroke reaches 75% of patients in major cities and 66% in outer regional areas. About 43% of Australians living with stroke live in regional electorates, which hold 38% of the population.

Aboriginal and Torres Strait Islander Australians are hospitalised for stroke at 1.7 times the rate of non-Indigenous Australians, with age-standardised incidence estimated around three times higher, and a 1.3 times greater risk of dying from stroke.

Of survivors living in the community, around 56% are male.

About a third of stroke events cause disability that prevents the person doing daily activities unassisted. One cited study found 10.1% of survivors completely dependent on carers and 33.4% partially dependent.

About 50% of survivors report feeling overwhelmed after discharge from hospital — a figure that says a great deal about where the Australian system is weakest.

What it costs

The companion economic impact report put direct financial costs at $6.2 billion in 2019–20, with a further $26.0 billion in lost wellbeing and premature mortality.

The largest single component of the direct costs is not hospital care. It is productivity: $3.6 billion, of which $1.77 billion is reduced employment and $731 million is informal care — about 39.7 million hours of unpaid care provided to roughly 34,041 people, averaging 36.7 hours a week per person receiving it.

Thirty-six hours a week is close to a full-time job, performed overwhelmingly by spouses and adult children, mostly unrecognised and unfunded.

What the first few days in hospital involve

Families are often too shocked to take in what is happening, and the sequence is worth having written down.

Imaging comes first, always. A CT scan distinguishes a bleed from a blockage, because the treatments are opposites. Many centres also do CT angiography to look for a large vessel occlusion that might be retrievable, and CT perfusion to see how much brain is already dead versus still salvageable. MRI gives better detail on small strokes and is sometimes used later.

Swallowing is screened before anything is given by mouth. This is not fussiness. Aspiration pneumonia is one of the commonest early complications and one of the most preventable. Expect the person to be kept nil by mouth until a swallow screen is passed, and do not give a relative a drink “to be kind” before that happens. See swallowing and nutrition after stroke.

Monitoring is intensive for the first 24 to 72 hours. Blood pressure, heart rhythm, blood glucose, temperature and neurological observations. Deterioration in the first days is common — from swelling around the infarct, from a bleed extending, or from a second event — and the monitoring exists to catch it.

The cause gets investigated, because that determines prevention. Prolonged cardiac monitoring looks for atrial fibrillation, which is intermittent and easily missed on a single ECG. Carotid imaging looks for arterial narrowing. Bloods look for cholesterol, diabetes and, in younger patients, clotting disorders.

Early mobilisation starts, and the guideline position is specific: out of bed within 48 hours where safe, but not intensive out-of-bed activity within the first 24 hours. Both halves of that matter.

The question families should ask in this period, and rarely do, is: “Has a rehabilitation assessment been requested, and what is the plan after the acute ward?” Access to inpatient rehabilitation drives a great deal of what happens next, and the referral is easier to secure while the person is still an inpatient.

Prevention: the figure that should be better known

More than 80% of strokes are preventable.

The Stroke Foundation estimates that eliminating high blood pressure alone would reduce strokes by 48%. Atrial fibrillation — an irregular heart rhythm that allows clots to form — is associated with about one in four strokes, and is frequently undiagnosed because it can be intermittent and asymptomatic. Statins reduce stroke risk by around 20%.

The modifiable risk factors are the ones you would expect: high blood pressure above all, atrial fibrillation, smoking, high cholesterol, diabetes, physical inactivity, obesity, excessive alcohol, and poorly controlled sleep apnoea.

Two practical implications.

For anyone reading this who has not had a stroke: get your blood pressure checked, and if you are over 65 or have palpitations, ask specifically about atrial fibrillation. A pulse check takes fifteen seconds.

For anyone who has had a stroke or TIA: secondary prevention is not optional and it is frequently neglected once rehabilitation starts. Blood pressure control, antiplatelet or anticoagulant medication, cholesterol management, smoking cessation and diabetes control are the things that prevent the next one. Survivors and families consistently report living with fear of a recurrence; the most effective response to that fear is a well-managed risk factor list.

What happens after: the pathway in Australia

The sequence most people follow, which is worth knowing in advance because decisions arrive fast.

Emergency department and acute stroke unit. Imaging, treatment decisions, monitoring. Admission to a dedicated stroke unit rather than a general ward measurably improves outcomes, which is why the regional access figures above matter.

Early mobilisation. Australian guidelines recommend starting rehabilitation on the first day and getting people out of bed within 48 hours where safe — but specifically not intensive out-of-bed activity within the first 24 hours.

Inpatient rehabilitation, for those who need and can tolerate it. This is where most functional recovery is built, and access to it varies by where you live and, uncomfortably, by age.

Discharge, which is the point at which half of survivors report feeling overwhelmed. Our leaving hospital guides cover the discharge process generally; the first year after stroke covers what happens next specifically.

Community rehabilitation and long-term support, which in Australia is funded through one of two entirely separate systems depending on a single fact — whether the person was under 65 at the time. That boundary is the most consequential thing in Australian stroke support and we deal with it in stroke and the NDIS and stroke over 65.

What to expect from recovery, honestly

Recovery after stroke is real, substantial and poorly explained to families.

The brain does not regrow dead tissue. What it does is reorganise — undamaged regions take over functions, pathways are strengthened by use, and the person relearns. This is neuroplasticity, and it is driven overwhelmingly by practice: repeated, specific, effortful practice of the thing you want to get back.

Recovery is fastest in the first weeks to months, which is why early intensive rehabilitation matters so much. But the frequently repeated claim that recovery stops at six months, or at twelve, is not supported by the evidence and it does harm. People continue to improve with training well beyond those points. What often happens at six months is not that the brain stops changing — it is that the therapy stops.

Equally, honesty matters in the other direction. Many stroke survivors do not return to their previous function, and being told to keep trying harder when the limitation is neurological rather than motivational is its own cruelty. Good rehabilitation does both: it pushes on what can change and it builds workarounds for what cannot.

Where to go next

If you are in the first weeks, read the first year after stroke for what rehabilitation should look like, and stroke and the NDIS — because the access question has a timing trap in it and applying at the wrong moment costs people months.

If communication is affected, aphasia after stroke is the one to read first, and to give to relatives.

If the person is over 65, read stroke over 65, because the funding system is entirely different and the decisions are largely one-way.

If you are supporting someone, supporting someone after stroke is the practical guide.

StrokeLine, run by the Stroke Foundation on 1800 787 653, is free, staffed by health professionals, and genuinely useful. The EnableMe website is its online counterpart.