4. cerebro vascular disease (cvd).ppt
DESCRIPTION
kuliahTRANSCRIPT
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Cerebro Vascular Disease (CVD) vs Stroke
Budhi Suwarma SpS.Budhi Suwarma SpS.
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Definition
CVD : any abnormality of the brain resulting from a pathologic process (occlusion, rupture,altered permeability,increase visco sity,other change in quality of the blood) of the blood vessels.
Stroke : sudden focal/global neurological deficit cause by primary vascular disorders last more than 24 hr or death.There are temporal profiles
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Stroke
Apoplexy, cerebrovascular accident (CVA) 50% of the neurologic ward admission Third commonest cause of death after heart
disease and cancer Incidence 2 %o , prevalence 4 %o
Every physician should at least know the common type
One of the most instructive approaches
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Stroke (cont.)
The neurologic deficit reflects both the location and size of the lesion
Temporal profile : Abruptness neurologic deficit develop Deficit reaches its peak almost at once (emboli) More slowly saltatory fashion/series of step
(thrombotic) Steadily progressive (intracerebral hemorrhage) Neurologic deficit arrest and then regression
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Stroke (cont.)
To demonstrate of cerebral lesion and the offending vessels : CT scan, MRI, Doppler/ ultra sound, TCD, Arteriography, MRA, LP, EEG
Major risk factors (RF) : Longterm controle of hypertension decreases the
incidence of both atherothrombotic infarction and intracerebral hemorrhage
Structural cardiac disease and arrhythmia particularly AF are the most important RF for embolic strokes
DM hastens the atherosclerotic process (l/s arteries) Long duration cigarette smoking~develop a.sclerosis
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CLASSIFICATION
Based on clinical appearance and temporal profile
FORMERLY RECENTLY ( CVD III )
TIA
RIND Improving stroke
( Reversible ischemic neurological deficit )
S.I.E. Worsening stroke
( Stroke – in – evolution / Progressing stroke )
Completed stroke Stable stroke
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Ischemic Stroke
The effects of occlusion vary depending upon the location and available collateral and anastomotic channels Prox. to the circ.Willis, acoma and pcoma are
often adequate to prevent infarction ICA, retrograde anastomotic flow from ECA
via ophthalmic a. VA,anastomotic flow via deep C, thyro C,
occipital a. or retrograde from the other VA Stem of Cerebral/Cerebellar,meningeal anast.
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Ischemic stroke (cont.Effects of occlusion depends upon :) Capillary anastomotic system between adjacent
arterial branches Ischemic modifying factors Speed of occlusion Level of blood pressure 02 and C02 Viscosity and Osmolality Hyperglycemia Anomalies of vascular Previous vascular occlusion
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Ischemic Stroke (pathophysiology)
Critical threshold of CBF in monkey 23 ml (N: 55 ml/100 gr/min)
CBF 12-23 abolish function,EEG slowed, ischemic penumbra,EC K+↑, ATP & Creatine Phosphate depleted
CBF 10-12 infarction regardless of its duration CBF 6-8 EC K+↓,IC Ca++↑,cellular acidosis, ne
crosis.Free fatty acid/phospholipase activated destroy the phospholipid membrane. Prostaglandin ,leukotrienes,free radicals accumulated protein & enzym denaturatedcellular edema
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Ischemic stroke (pathophysiology)
Excitatory neurotransmitter (GLU & ASP) released by ischemic cellsinflux Na & Ca, irreversible injury
Free radical productionperoxidation & destruction of the outer cell membrane
Accumulation of lactic acid (neurotoxic) Reduction of body temperaturereduce
metabolismincrease tolerance
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Ischemic stroke (Neurovascular syndrome-Carotid system) CCA Occlusion (only less than 1% of carotid
a.syndrome), mostly thrombotic. ICA Occlusion (most frequently in the first
part/immediately beyond the bifurcation), mostly thrombotic,often silent Embolus arising from thrombus (a to a embolism) Watershed/borderzone between their branches In case of no communication to the side of occluded
via circ. Willis massive infarction involving 2/3 hemi sphere including basal ganglia
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Ischemic stroke (Neurovascular syndrome-Carotid system cont.) MCA occlusion,mostly embolic
Stem (block the flow in deep penetrating & superficial cortical branches) : hemiplegi c.l., hemianesthesia c.l.,HH c.l.,deviation of the head and eyes toward the lesion,dull/stuporous,global aphasia (L),anosognosia-amorphosynthesis (R)
Superior division : dense sensory-motor deficit face & arm c.l.,deviation of head & eyes toward the lesion, alert, predominantly motor aphasia
Inferior division (less frequent) : Wernicke aphasia (L) superior quadrantopsia, left visual neglect, amorpho synthesis
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Ischemic stroke (Neurovascular syndrome-Carotid system cont.) ACA occlusion
Stem prox to acoma is usually well tolerated Distal to acoma : sensory-motor deficit of the opposite
foot and leg,deviation of head&eyes toward the lesion urinary incontinence, grasp & gegenhalten c.l.,symph athetic apraxia left arm/leg,left alien arm/hand,trans cortical motor aphasia (occlusion of Heubner a.), right hemiplegia leg>arm,grasping&groping right hand,bu ccofacial apraxia,absence of spontaneous speech, agraphia,telegraphic speech,dysnomia,able to repeat spoken/written sentences,abulia,whisper,distractable
Penetrating branches : transient hemiparesis, dysar thria,abulia/agitation-hyperactivity
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Ischemic Stroke (Neurovascular Syndrome-Carotid system cont.) Ant Choroidal A.occlusion : hemiplegia
c.l.,hemihypesthesia c.l.,HH c.l.,cognitive function spared,left spatial neglect & con structional apraxia (R),dysphasia (L)
NB : a branch from ICA just above the origin of pcoma
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Ischemic Stroke (Neurovascular Syndrome-Vertebrobasilar System)
Anterior-proximal PCA occlusion: Thalamic syndrome Dejerine-Roussy:hemian
esthesi c.l.,transitory hemiparesis c.l.,HH c.l. Central midbrain-subthalamic syndrome : III i.l.,
hemiplegia c.l., upgaze palsy, stupor/ coma, ataxia/tremor c.l.
Antero-medial-inferior thalamic syndrome : hemibalismus,hemichoreoathetosis, hemiataxia, tremor, deep sensory loss.
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Ischemic Stroke (Neurovasc.Synd.-Vertebrobasilar System cont.) Cortical syndrome : HH macular sparing,
visual hallucination, metamorphopsia, palinopsia. Dominant side : alexia +/- agraphia, anomia, visual agnosia.
Bilateral cortical syndrome : HH bilateral, unformed vis.hal.,Anton syndrome,gun barrel vision,altitudinal field defect, Balint syndrome, Korsakoff amnestic, prosopagnosia.
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Ischemic Stroke (Neurovasc.Synd.-Vertebrobasilar System cont.) Vertebral a. : Lateral medullary syndrome
(Wallenberg), medial & posterior medullary syndrome.
Basilar a.: Complete basilar (comatous, bi lateral long tract,cerebellar & cranial signs) Locked-in syndrome,Top of the basilar syndrome, Crossed syndrome
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Ischemic Stroke (Lacunar)
Small cavity Ø 3-15 mm Occlusion of small arteries Ø 50-200 μm Strong correlation with hypertension-arterio
sclerosis - DM Incidence 11% post mortem examination Pure motor,pure sensory,dysarthria-clumsi
ness of one hand, hemiparesis-ataxic
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Ischemic Stroke (The Major Types)
Atherothrombotic Brain Infarct (ABI) : 32% Embolism (TES & CES) 32% Lacunes (LACI) 18% Primary Intracerebral Hemorrhage 11%
(PICH) Ruptured Aneurysm/AVM (SAH) 7%
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ABI
Risk Factors : Major-Minor / Modifiable-Non modifiable. Hypertension, Dyslipidemia, DM aggravate
the atheromatous process. Age, gender, family history, genetic,
cigarette smoking, obesity, satiety life. The most frequent sites are : origin ICA,
cervical part VA/junction to form BA, stem/ main bifurcation MCA, PCA around mid- brain, ACA curve over corpus callosum.
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ABI
Atheromatous lesions develop silently 20-30 / more years thrombotic complication
May regress to some extent (diet/drug) but in the large majority a progressive disease
Degeneration of / hemorrhage into the wall of a sclerotic vesseldamage the endothelium platelet & fibrin adheredelicate friable clot. Subintimal atheromatous deposit may slough, spewing crystalline cholesterol emboli. Thrombotic particles may break off repeatedly. (artery to artery emboli)
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ABI (Clinical picture)
75% is preceded by minor signs 1 / > TIAs lasts a few min to several hr;mostly<l0 min Carotid system :amaurosis fugax,hemiparese,
hemiesthesia,disturbance of speech/language VB system : dizziness, diplopia, numbness,
impaired visual field, dysarthria Step like/wise development, gradual fashion Onset during sleep/awakening
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ABI (Clinical picture cont)
Hypertension +,DM+,Vascular diseases in other parts + (coronary, angina, abn ECG, intermittent claudication, pulseless)
Headache ±, seizure±, fatiqability and depressed (left fr lobe), MID, Binswanger subcortical leukoencephalopathy.
Detection by USG, CT, MRI-MRA, conventional angiography
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TIA
Brief reversible episodes of focal non-con vulsive neurologic disturbance,duration <24 hr
Embolism : last only a few min, multiple episodes of different pattern
Vascular occlusion : repeated ones of uni form type
The 5-year cummulative rate of fatal/non fatal cerebral infarct 23%
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TIA (mechanism)
Vascular stenosis ulcerated e.c. athero sclerosis thrombus formation. Detection by USG & DSA
Rheologic changes (anemia, polycythemia, thrombocythemia, hyperlipidemia, hyperviscosity, sickle-cell)
Hypotension :orthostatik, awakening
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TREATMENT OF ABI & TIA
Prevention of stroke by finding patients in the asymptomatic stage of atherosclerosis
Treat patients who have already symptom Management in the acute phase Measures to restore the circulation and arrest
the pathologic process Physical therapy and rehabilitation Measures to prevent further strokes and
progression of the vascular disease
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TREATMENT OF ABI & TIA(cont)
Management in the acute phase in Stroke unit with specially trained clinical staff and technology to monitor BP, pulmonary func tion, blood gas, ICP
Measures to restore the circulation and arrest the pathologic process : Penumbra will survive if perfusion can be re-
established Major stroke : avoid upright position in the 1st
day to maintain cerebral perfusion
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TREATMENT OF ABI & TIA(cont)
Antihypertensive drug is preferably defered until neurologic deficit has stabilized
Anemia corrected, polycythemia should be reduced
r-TPA 0,9 mg/kgBW, 10% bolus, 90% infus 1h Acute surgical revascularization (clot removal,
bypass procedure) Treatment of cerebral edema and raised ICP Hemicraniectomy.
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TREATMENT OF ABI & TIA(cont)
Anticoagulant drugs (warfarin & heparin) Fluctuating BA thrombosis Impending ICA occlusion CES possible need for immediate hepariniza
tion No great value once the stroke is fully develop
ed Check PT, BP <200/120, Exclude ICH
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TREATMENT OF ABI & TIA(cont)
Antiplatelet drugs Aspirin 325 mg Ticlopidine 250 twice daily Dipyridamole, sulfinpyrazone Clopidogrel
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EMBOLIC INFARCTION
Most cases : fragment from thrombus within the heart
Less frequently : A to A from atheromatous plaque carotid / vertebral
Any region of the brain may be affected most frequently MCA superior division
Very rapid occlusion no collateral influx
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EMBOLIC INFARCTION (con)
No warning, onset anytime Chronic AF, paroxysmal AF/flutter, MCI,
cardiac cath/surgery, valvuloplasty, valve -prothese, paradoxic embolism, MVP
30% produces hemorrhagic transformation of the infarct (HTI)
ECG, Echocardiography TTE & TEE
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Embolic Infarction (Treatment & Prevention) General medical management in acute phase Measures directed to restoring the circulation Physical therapy and rehabilitation Prime importance is the prevention of CE
Long term AC in AF, MCI, Valve prothesis Electrical cardioversion for recent AF
Firm diagnosis of CE : begin heparin/ LMWH followed by warfarin
Risk of AC : large infarct, deep infarct
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Primary Intracerebral Hemorrhage
Massive Ø several cm , small Ø 1-2 cm , slit old collapsed hemorrhage
Due predominantly to chronic hypertension and degenerative arterial changes
Hematoma distort and compress the adja- cent brain tissue midline shift ARAS and respiratory center are compromised
Seepage into ventricle system usually occurs bloody CSF
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PICH (cont)
Edema accumulates around the clot and adds to mass effect hydrocephalus
After 2-3 mo slit hemorrhage The most common sites :
Putamen-internal capsule Lobar Thalamus Cerebellar hemisphere Pons Intraventricular, midbrain, medullary
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PICH (Pathogenesis)
Hypertensionsegmental lipohyalinosis microaneurysm
Symphatomimetic medication,cocaine, other circumstances Tensi ↑
Amyloidosis Anticoagulant Vascular malformation Hematologic disorder,liver,renal,lymphoma
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PICH (Clinical picture)
The most dramatic stroke / apoplexy, obese, plethoric, hypertensive male, while sane and sound falls impervious to shout, shaking, pinching, breaths stertorously dies in a few hours
Smaller hemorrhages : abrupt onset evolve gradually and steadily over minutes, hours, headache and vomiting
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PICH (Clinical picture)
Very small hemorrhages in silent region escape clinical detection
Average age is lower than in ABI Incidence > black people, Japanese Onset mostly while active , upright Neurologic deficit is never transitory Condition worses over a few hours
there is enlargement of the hematoma
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PICH (Clinical picture)
Summary : Acute reactive hypertension far exceeding the
patient’s chronic hypertension level Severe headache Nuchal rigidity Vomiting at the onset Seizure focal
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PICH (Clinical picture)
Putaminal hemorrhage (usually extend to the adjacent internal capsule) Gradual progression a few min-30 min Headache Vomiting Hemiplegia c.l. Stupor,coma Deviation conjugae to the side of lesion
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PICH (Clinical picture)
Thalamic hemorrhage (large/moderate size compress the adjacent int.capsule) Hemiplegia/hemiparese c.l. Hemihypesthesia c.l. Fluent aphasia (D),amorphosynthesis/neglect (ND) Extension to subthalamus and high midbrain: gaze
palsy V&L, forced downward, anisocor, skew deviation c.l. eye, ptosis-miosis i.l., retraction nystagmus, compression 3rd ventricel
≤ 8 mm recovery, 9-30 mm survive, > 30 mm + sec IVH die
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PICH (Clinical picture)
Pontin hemorrhage Deep coma in a few minutes Tetraparesis Decerebrate rigidity Miosis 1 mm reactive Horizontal gaze palsy Death usually occurs within a few hours Small tegmental hemorrhagegood recovery
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PICH (Clinical picture)
Cerebellar hemorrhage Occipital headache Repeated vomiting Vertigo Deviation conjugae away from the lesion /
ocular bobbing Inability to sit/stand/walk Small cases : nystagmus,cerebellar ataxia
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PICH (Clinical picture)
Lobar hemorrhage Progressively worsening headache Vomiting Drowsiness 40% occipital, 25% temporal, 15% frontal,
11% parietal
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PICH (laboratory)
CT detects hemorrhage ≥ 1 cm MRI is useful for brainstem hemorrhage or
residual hemorrhage (after 4-5 weeks) Era pra CT diagnosis depend on LP WBC 15.000-20.000
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PICH (Course and Prognosis)
Large and medium size hematome 35% die 60 ml in the basal ganglia fatal, but may be
relatively benign in lobar Putaminal / thalamic hemorrhage
≤ 30 ml favorable outcome ≥ 60 ml, GCS ≤ 8 mortality 90%
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PICH (Treatment)
Maintain adequate ventilation Controlled HV PCO2 25-30 mmHg Raised ICP mannitol (Osm 295-305; Na
145-150 mEq) Fluid intake 1200 ml/d NaCl 0,9% Reduction of hypertension 20-25% Surgical removal : deteriorating hemispheral
> 30 mm. Cerebellar is a more urgent, > 30-40 mm evacuation
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SUBARACHNOID HEMORRHAGE (SAH) The 4th most frequent Stroke following ABI, Embolism
and PICH Cause by rupture of saccular / berry aneurysm
Development defects in the media&elastica, Focal destruction the int elastica memb. by hemodynamic forces
Size 2 mm-30 mm 90-95% lie on the anterior part of the circle of Willis Co-incidence : Congenital polycystic kidney,Fibromus
cular dysplasia of EC aa,Moya2,Coarctation of aorta Peak incidence 35-60 yrs
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SAH (Clinical Pictures)
Pre rupture : localized head pain ± 3rd CN (± 2nd CN, ± Chiasm) (warning sign)
Rupture : Excruciating generalized head ache,vomiting ± unconsciousness. Usually occurs while active, sexual intercourse, straining, lifting heavy object etc.
Re rupture may occur at anytime, minutes - 3 weeks later (unpredictable)
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SAH (Clinical Pictures)
Less severe cases regained conciousness within a few min/hr, drowsiness, confusion, amnesia, severe headache, stiff neck, few/ no lateralizing neurologic signs
Vasospasm 3-l2 d after rupture delayed neurological deficit
Hydrocephalus after 2-4 weeks, patient become confused / unconscious
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SAH (Clinical Pictures)
Spontaneous IC hemorrhage with normal BP should suggest ruptured aneurysm / AVM, bleeding diathesis, hemorrhage into tumor
Nuchal rigidity occasionally absent (1st 4 hr or deep coma
Interscapular/LB pain rather than headpain Pre retinal / subhyaloid retinal hemorrhage
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SAH (Laboratory)
CT scan detect blood in SA/brain/ventricel Coexistent hydrocephalus
Clinical suggest SAH but CT normal LP (grossly bloody / deep xanthochromia, opening pressure 50 cm H2O
Conventional angiography (MRA insuffic.) ECG changes, hypo Na, WBC 15.000 -
18.000
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SAH ( Site of rupture)
Main clot on CT scan Anterior interhemisphere fissureacoma Sylvian fissureMCA Ant.perimidbrain cisternpcoma/distal basilar
Clinical signs 3rd CN palsyjunction pcoma-ICA Transient paraparesisacoma Hemiparesis/aphasia1st major bifurcat MCA Akinetic mutism/abuliaacoma
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SAH (Treatment)
Assess with Botterell & Hunt-Hess Grade 1 : slight headache & stiff neck Grade 2 : moderate / severe headache +
nuchal rigidity, rare focal / lateralizing sign Grade 3 : drowsy, mild focal deficit Grade 4 : stupor / semicoma Grade 5 : deep coma, decebrate rigidity
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SAH (Treatment)
Bed rest, i.v.line, stool softener, systolic ≤150 mmHg, pain relieving headache
Grade 1-2 : operate early within 36 hr then increase intravasc volume,BP N/ above N
Grade 3 ? Grade 4 : ventricular drain Grade 5 : conservative
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ARTERIOVENOUS MALFORMATION (AVM) Developmental abn / abn communication
between the A and V system Size a few mm- large mass (SOL like, CO↑,
intracerebral steal) Incidence 1/10 saccular aneurysm Men = women
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AVM ( Clinical picture)
Pre rupture : chronic,recurrent headache (non discript type, 10% migraineus), convulsion c.l. side, systolic bruit over carotid, mastoid pro- cess, eye ball in young adult, rarely retinal AVM,cutaneus AVM, naso- pharyngeal AVM
Rupture : similar with SAH (aneurysm) + neurological deficit at the onset
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AVM ( Laboratory)
95% AVM disclosed by CT, >95% by MRA Conventional angiography AVM Ø 5 mm
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AVM (Treatment)
Surgical excission, mortality rate 2-5%, morbidity rate 5-25%
Ligation of feeding artery Endovascular embolization Low dose focused proton beam
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COMPLICATIONS
A. Neurologic complications
Brain edema
Hemorrhage infarction
Vasospasm
Hydrocephalus
Hygroma
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COMPLICATIONS ( cont’ )
B. Non – neurologic complication
1. Due to intracranial process
Increase blood presure
Hyperglicemia
Pulmonary edema
Cardiac disorders
2. Due to immobilitation
Bronchopneumonia
Thrombophlebitis
Bladder infection
Decubitus
Contracture