Clinical Guides
Stroke (Cerebrovascular Accident)
A clinically focused guide to recognising stroke, separating ischaemic from haemorrhagic pathways, and organising time-critical imaging, reperfusion, complication prevention and rehabilitation in Indian practice.
MedNext Academy | 13 min read
Stroke (Cerebrovascular Accident)
A clinically focused guide to recognising stroke, separating ischaemic from haemorrhagic pathways, and organising time-critical imaging, reperfusion, complication prevention and rehabilitation in Indian practice.
Summary
Stroke is an acute neurological syndrome caused by cerebral, retinal or spinal vascular injury. Ischaemic stroke results from arterial occlusion and infarction; intracerebral or subarachnoid haemorrhage results from bleeding. The first minutes should be spent identifying the last-known-well time, airway and circulation problems, glucose, seizure or trauma, anticoagulant exposure and a disabling focal deficit. A resolving deficit is not automatically a TIA: persistent symptoms or diffusion-restricted infarction are stroke, and recurrent symptoms remain an emergency.
The treatment route depends on imaging and mechanism. Non-contrast CT rapidly excludes intracranial haemorrhage and major mimics; CT angiography identifies large-vessel occlusion, dissection and relevant stenosis. Selected patients with disabling ischaemic stroke may receive intravenous thrombolysis within the licensed window, while selected proximal large-vessel occlusions may benefit from thrombectomy within 6 hours and, after advanced imaging selection, up to 24 hours. These treatments belong in an organised stroke service with trained staff and immediate imaging, not improvised bedside prescribing.
Haemorrhage requires a different pathway: stop and reverse relevant anticoagulation, manage blood pressure carefully, treat raised intracranial pressure and obtain neurosurgical or neurocritical-care advice when indicated. Across both types, prevent aspiration, hypoxia, fever, hypoglycaemia and venous thromboembolism; screen swallowing before oral intake; and start multidisciplinary rehabilitation when medically safe. This educational draft remains reviewed educational guide. It cannot replace local emergency protocols or an individual specialist decision.
How Common Is It?
Stroke is a major cause of death and acquired disability worldwide, but a headline global or Indian count does not predict an individual patient's mechanism or treatment eligibility. Case ascertainment varies with age structure, rural access, imaging, death before hospital and whether recurrent events are counted. India has substantial burdens of hypertension, diabetes, tobacco exposure, dyslipidaemia, rheumatic and ischaemic heart disease, and delayed presentation; these interact with uneven availability of stroke units, CT angiography, thrombolysis, thrombectomy and rehabilitation. A local service should audit onset-to-door, door-to-imaging, door-to-needle, thrombectomy transfers, dysphagia screening, mortality and functional outcome rather than importing a denominator.
Ischaemic stroke is more common than haemorrhagic stroke in most registries, but intracerebral haemorrhage remains especially important because uncontrolled hypertension, anticoagulation and delayed access can worsen outcome. Young stroke is not synonymous with a rare genetic disease: dissection, cardioembolism, pregnancy-related hypertension, infection, inflammatory disease and conventional vascular risks all need a phenotype-led assessment. Conversely, older age does not prove a lacunar or atherosclerotic mechanism.
Population evidence and treatment trials often come from systems with rapid ambulance transport, advanced imaging and reliable follow-up. Their relative benefits support time-critical principles but do not guarantee that every Indian hospital can provide the intervention. Referral maps, tele-stroke support, affordable medicines, family education and community rehabilitation are therefore part of quality, not optional extras. The safe clinical question is always what can be delivered now, where the patient can be transferred, and who owns the next decision.
Risk Factors
Hypertension is the most important modifiable risk factor for both ischaemic and haemorrhagic stroke. Diabetes, smoking and smokeless tobacco, dyslipidaemia, obesity, physical inactivity, chronic kidney disease, sleep apnoea and prior vascular disease add risk. Atrial fibrillation, rheumatic mitral stenosis, prosthetic valves, cardiomyopathy, recent myocardial infarction and left-ventricular thrombus can generate emboli. Carotid or intracranial atherosclerosis, small-vessel disease and arterial dissection produce different imaging and prevention pathways. Do not infer mechanism from a risk-factor list alone.
Ask about anticoagulant and antiplatelet exposure, adherence, recent procedures, malignancy, infection, cocaine or stimulant use, pregnancy or puerperium, migraine, seizure, trauma and family history. In younger adults consider dissection after neck pain or trauma, cardioembolic disease, antiphospholipid syndrome, sickle-cell disease, vasculitis, cerebral venous thrombosis and selected inherited disorders when the presentation supports them. In older adults consider amyloid angiopathy or malignancy when haemorrhage pattern and history suggest it.
Social and system factors are clinically relevant: distance from a stroke centre, ambulance availability, medicine affordability, literacy, caregiving, language, missed follow-up and unsafe housing can change outcome. Risk-factor treatment is not merely a discharge checklist. It needs measured blood pressure, lipid and glucose assessment, smoking cessation support, medication reconciliation, activity and diet advice, sleep assessment where relevant, and a plan that the patient can obtain and understand. Avoid assigning blame when poverty, disability or access barriers drive delayed care.
Diagnosis
History
Establish the exact symptom onset or last-known-well time, the time of maximum deficit, progression, recovery, witnessed seizure, headache, vomiting, collapse, trauma and preceding infection. Characterise aphasia, dysarthria, neglect, visual field loss, monocular blindness, diplopia, ataxia, unilateral weakness or sensory loss. Ask about baseline function, disability, anticoagulant name and last dose, antiplatelet use, recent surgery or bleeding, pregnancy, glucose-lowering medicines and prior stroke. A witness, family member, ambulance record or phone video may resolve uncertainty. Do not use a symptom that is improving as permission to delay assessment.
Examination
Stabilise airway, breathing and circulation while recording temperature, oxygen saturation, blood pressure, capillary glucose and cardiac rhythm. Perform a focused but complete neurological examination: consciousness, language, neglect, visual fields, eye movements, pupils, facial symmetry, dysarthria, limb power, tone, sensation, coordination, gait when safe and cortical signs. Record a reproducible NIH Stroke Scale where trained, while remembering that a low score can miss disabling aphasia, hemianopia or posterior-circulation disease. Look for meningism, seizure, trauma, anticoagulant bleeding, arrhythmia, murmur, endocarditis and aortic dissection.
Investigations
Obtain urgent non-contrast CT. Add CT angiography from arch to vertex when large-vessel occlusion, dissection or carotid disease is possible; CT perfusion or diffusion MRI may select late-window thrombectomy in suitable centres. MRI can define infarct, posterior fossa disease or an alternative diagnosis but must not delay reperfusion when CT-based eligibility is clear. Check glucose, full blood count, electrolytes, renal and liver function, coagulation studies when relevant, pregnancy status when relevant, ECG and troponin if clinically indicated. Echocardiography and prolonged rhythm monitoring are mechanism-directed. In haemorrhage, repeat imaging, vascular imaging and laboratory reversal assessment depend on clinical course and suspected cause.
Differential Diagnosis
The dangerous alternative to stroke is not a normal CT but a different time-critical disorder. Hypoglycaemia can cause focal deficit and must be checked immediately; seizure may cause ictal signs or postictal weakness, but a first seizure with a persistent focal deficit still needs stroke imaging. Migraine aura often spreads gradually with positive visual or sensory features and may be followed by headache, yet first or atypical aura in an older person remains a diagnosis of exclusion. Syncope is global loss of consciousness rather than a focal arterial syndrome, although arrhythmia may coexist.
Vestibular neuritis and benign positional vertigo do not explain every acute vestibular syndrome; inability to walk, direction-changing nystagmus, diplopia, limb ataxia or new hearing symptoms may indicate posterior circulation disease. Bell palsy, radiculopathy, peripheral neuropathy and musculoskeletal pain can mimic selected signs. Functional neurological symptoms require positive inconsistency or incongruity, not a dismissive psychiatric label or an unrevealing early scan.
Intracranial tumour, subdural haematoma, cerebral venous thrombosis, encephalitis, meningitis, toxic-metabolic encephalopathy, demyelination, hypertensive encephalopathy and spinal cord disease expand the differential according to context. Severe thunderclap headache with neck stiffness raises subarachnoid haemorrhage; a CT-negative patient may need lumbar puncture or vascular imaging under a specialist pathway. A transient deficit with infarction is minor ischaemic stroke, not TIA, while haemorrhage on imaging excludes thrombolysis. Imaging, chronology and examination must be interpreted together.
Management
Activate a stroke team and transfer to a stroke-capable service. Correct hypoglycaemia, hypoxia, fever and seizures, but do not delay imaging or reperfusion assessment for routine tests. In eligible disabling ischaemic stroke, intravenous alteplase or tenecteplase may be given within the licensed 4.5-hour window after haemorrhage is excluded and blood pressure and contraindications are checked. Selected proximal anterior-circulation occlusions should receive thrombectomy as soon as possible within 6 hours, and selected late or wake-up presentations up to 24 hours after imaging-based assessment. Thrombolysis and thrombectomy decisions are specialist decisions; a low NIHSS does not make a disabling deficit benign.
After haemorrhage is excluded, aspirin is used for most non-cardioembolic ischaemic strokes unless contraindicated; timing and dose follow the stroke protocol. Do not start anticoagulation immediately merely because atrial fibrillation is present; infarct size, haemorrhagic transformation, repeat imaging and specialist timing determine the plan. For intracerebral haemorrhage, stop anticoagulants, give agent-specific reversal urgently, lower blood pressure smoothly when indicated, manage fever and glucose, and involve neurocritical care or neurosurgery. Do not give antiplatelets or thrombolytics down the haemorrhagic pathway.
Screen swallowing before food, fluid or oral medication. Prevent aspiration, pressure injury and dehydration; use intermittent pneumatic compression for immobile patients when appropriate and avoid routine graduated stockings. Mobilise and rehabilitate with a coordinated team when stable, avoiding harmful very-early high-intensity mobilisation. Plan secondary prevention, communication therapy, mood and cognition assessment, caregiver training, discharge equipment, driving or work advice and early supported follow-up.
Prescribing Information
No thrombolytic or reversal dose should be copied from an educational page. Verify licensed product, weight, timing, imaging, blood pressure, anticoagulant exposure, renal function, platelet count, recent surgery, bleeding history and local protocol. Thrombolysis requires a monitored stroke service with immediate imaging and a plan for post-treatment neurological deterioration or bleeding. Blood pressure thresholds differ by pathway: lowering to a thrombolysis-appropriate target is distinct from permissive management in some untreated ischaemic stroke, while intracerebral haemorrhage has its own early blood-pressure strategy.
Aspirin is not given until haemorrhage is excluded. Dual antiplatelet therapy is reserved for selected early minor non-cardioembolic stroke or high-risk TIA populations and has a defined short duration; it is not routine after thrombolysis or a substitute for anticoagulation in atrial fibrillation. Oral anticoagulant restart after cardioembolic stroke requires specialist assessment of infarct burden and bleeding risk. Mechanical valves, rheumatic mitral stenosis, pregnancy, severe renal impairment and drug interactions alter choice.
Continue or initiate lipid-lowering and antihypertensive therapy as clinically appropriate, but do not abruptly lower cerebral perfusion or prescribe a statin without reviewing liver disease, interactions, swallowing and goals. Check venous-thromboembolism prophylaxis, constipation, urinary retention, pain and spasticity; avoid sedatives that obscure neurological observation when possible. Give families a written generic medicine list, purpose, duration, missed-dose and bleeding advice. A swallowing assessment determines whether oral formulations are safe. Every prescription must name the responsible clinician and review date.
When to Refer
Every suspected stroke needs emergency transfer to a stroke-capable service, even when symptoms improve. Refer immediately for any persistent or recurrent face, arm, speech, visual, neglect, ataxic or consciousness deficit; sudden severe headache; seizure with focal signs; anticoagulant exposure; suspected dissection; or a posterior-circulation syndrome. The handover should include last-known-well, baseline independence, examination or NIHSS, glucose, blood pressure, anticoagulant and antiplatelet names and last doses, recent surgery, imaging performed and the treatment question.
Transfer to a thrombectomy-capable centre when CTA shows a proximal large-vessel occlusion or local expertise cannot assess one rapidly. Discuss neurosurgery or neurocritical care for cerebellar or lobar haemorrhage with deterioration, hydrocephalus, mass effect, aneurysm or vascular-malformation concern, large hemispheric infarction with swelling, and any airway or consciousness problem. Haematology, cardiology, vascular surgery, obstetric medicine, oncology or infectious diseases input is mechanism-led.
Before discharge, involve physiotherapy, occupational therapy, speech and language therapy, dietetics, psychology, social work and rehabilitation medicine according to disability. Arrange rhythm monitoring, carotid review, echocardiography and risk-factor follow-up with named ownership. In India, a referral is only useful if transport, cost, language, records and appointment availability are addressed. If advanced care is unavailable, document the limitation, stabilise, consult by tele-stroke and transfer according to a pre-agreed pathway rather than offering false reassurance.
Red Flags
Worsening consciousness, anisocoria, repeated vomiting, severe headache, new pupillary abnormality, seizures, rapidly increasing weakness or respiratory compromise can indicate expanding haemorrhage, cerebral oedema, herniation or aspiration. New fever, hypoxia, chest pain, hypotension, arrhythmia, recurrent focal deficit or a sudden post-thrombolysis headache requires immediate reassessment and repeat imaging or critical-care action. Do not attribute deterioration to fatigue or rehabilitation without examining the patient.
In ischaemic stroke, malignant hemispheric infarction, cerebellar swelling, basilar occlusion, a large-vessel occlusion or a disabling deficit with a low NIHSS are high-risk situations. In haemorrhage, anticoagulant use, large volume, intraventricular extension, hydrocephalus, posterior fossa location, uncontrolled blood pressure and neurological decline demand urgent specialist escalation. A normal first CT does not exclude early infarct, posterior stroke or subarachnoid haemorrhage.
Complication warnings include coughing or wet voice with oral intake, reduced urine, pressure injury, painful swollen calf, new breathlessness, delirium, depression, suicidal thinking, falls, shoulder injury and caregiver exhaustion. Avoid routine oral medication until swallow safety is known. A family should seek emergency help for new FAST symptoms rather than transporting a patient privately when transfer is unsafe. Any patient discharged with unresolved diagnostic uncertainty needs explicit return precautions and a 24-hour contact route.
Indian Clinical Context
Indian stroke care spans district hospitals, private facilities, medical colleges and tertiary comprehensive centres with major differences in CT availability, ambulance transport, thrombolysis stock, thrombectomy access, neurosurgery, rehabilitation and affordability. The Government of India national stroke guideline supports organised prevention, acute management, referral and rehabilitation, but each institution must translate this into a real 24-hour pathway. Map the nearest CT, CTA, thrombolysis and thrombectomy services, ambulance contacts, tele-stroke backup, reversal agents and rehabilitation provider before an emergency occurs.
Do not let cost or rural distance create a false diagnosis of TIA or a contraindication that has not been checked. Explain uncertainty and likely charges early; use generic names, government schemes and social-work support where available. Warfarin can be affordable but requires reliable INR monitoring; direct oral anticoagulants reduce monitoring burden but may be unaffordable or intermittently stocked. Discharge teaching should use the family's language and account for low literacy, travel, caregiving, diet, tobacco, traditional medicines and fragmented records.
Hypertension, diabetes, rheumatic heart disease, intracranial atherosclerosis and tobacco exposure are important clinical contexts, but ancestry is not a diagnostic shortcut. Carotid thresholds and thrombectomy evidence come largely from international trials; local procedural outcomes and transfer delays affect benefit. Services should measure equitable access and functional outcomes, not only treatment counts. This guide does not override Indian product labels, state protocols, hospital formulary decisions, medico-legal requirements or bedside specialist judgement.
NMC Competency Mapping
Stroke teaching maps to NMC CBME competencies in neurological history and examination, emergency care, interpretation of imaging and ECG, pharmacology, communication, rehabilitation and prevention. The learner should identify a disabling focal deficit, state last-known-well, perform glucose and ABC stabilisation, use a structured neurological scale when trained, and recognise that a low score can hide aphasia, visual disability or posterior stroke. Examination should include language, neglect, visual fields, eye movements, cranial nerves, power, sensation, coordination and gait when safe.
Diagnostic reasoning includes ischaemic stroke, intracerebral haemorrhage, subarachnoid haemorrhage, TIA, seizure, migraine, hypoglycaemia, vestibular disease and functional symptoms. Learners should explain the roles and limits of non-contrast CT, CTA, perfusion imaging, MRI, ECG, cardiac monitoring and echocardiography. Pharmacology competencies include safe aspirin timing, thrombolytic eligibility, anticoagulant reversal, blood-pressure treatment, statins, VTE prevention and swallow-safe administration. They should explicitly state that prescribing doses, thrombolysis and reversal require supervision and local protocol.
OSCE cases can test a wake-up stroke with LVO, a hypertensive ICH on apixaban, dysphagia after stroke and a family discharge conversation. Assess whether the candidate separates haemorrhagic from ischaemic pathways, escalates to thrombectomy or neurosurgery, avoids unsafe antithrombotic overlap, and explains rehabilitation goals. Undergraduate competence is recognition, initial safety and coordinated referral; it is not independent authority to select reperfusion, reverse anticoagulation, operate or certify this quarantined draft as clinically approved.
Key Exam Pearls for NEET PG
First question: is the patient stable, and what is the last-known-well? Check glucose and obtain urgent non-contrast CT. Ischaemic stroke is treated differently from intracerebral haemorrhage; do not give aspirin, thrombolytic or anticoagulant before haemorrhage is excluded. CTA identifies large-vessel occlusion. Selected disabling ischaemic strokes receive IV thrombolysis within 4.5 hours, while selected proximal LVOs receive thrombectomy within 6 hours and, with favourable advanced imaging, up to 24 hours. Wake-up time is not automatically a treatment exclusion.
A low NIHSS does not equal a non-disabling stroke. Aphasia, hemianopia, dominant-hand weakness and posterior-circulation deficits may be functionally major. Blood pressure management is pathway-specific: a thrombolysis candidate needs the protocol target, whereas an untreated ischaemic stroke and acute ICH are not managed with one universal number. Screen swallowing before oral intake. Use intermittent pneumatic compression for immobile patients when appropriate; routine compression stockings are not a substitute.
For ICH, stop and reverse relevant anticoagulation promptly, manage blood pressure smoothly, repeat imaging when deterioration occurs and seek neurocritical or neurosurgical advice. For non-cardioembolic stroke, aspirin follows haemorrhage exclusion; selected minor stroke patients may receive time-limited dual antiplatelet therapy. AF generally calls for anticoagulation after infarct-size and bleed-risk assessment, not automatic immediate treatment. Rehabilitation, caregiver training and secondary prevention start in hospital. “Time is brain” is an operational instruction, not a reason to bypass safety checks.
Frequently Asked Questions
Can a patient with improving stroke symptoms wait for a routine appointment?
No. Improvement does not establish TIA and recurrent or residual deficit may still need reperfusion, vascular imaging or treatment of haemorrhage. Record last-known-well and activate emergency stroke assessment. A normal early CT does not exclude infarction or posterior-circulation stroke. Emergency transport is safer than self-driving when deficits are present.
When are thrombolysis and thrombectomy considered?
They are specialist, imaging- and time-dependent treatments. Selected disabling ischaemic strokes may receive intravenous thrombolysis within the licensed early window after haemorrhage and contraindications are assessed. Selected proximal large-vessel occlusions may receive thrombectomy within 6 hours or later with favourable advanced imaging. A low NIHSS or symptom improvement does not settle eligibility.
Why is aspirin unsafe before brain imaging in suspected stroke?
Aspirin can worsen intracranial bleeding and does not treat haemorrhage. Non-contrast CT or an equivalent urgent specialist pathway must first address haemorrhage. Once bleeding is excluded, antiplatelet treatment depends on stroke mechanism, swallowing, allergy, bleeding risk and whether thrombolysis was given.
What is the first swallowing precaution after stroke?
Keep the patient nil by mouth for food, fluid and oral medicines until a trained professional completes a swallow screen. Coughing, wet voice, recurrent chest infection or an abnormal screen requires specialist assessment and a safe nutrition and medication plan. Do not crush or substitute medicines without checking formulation and tube compatibility.
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