neuro icu management of subarachnoid haemorrhage
TRANSCRIPT
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Subarachnoid Haemorrhage
Dr S Arun-CastroMBBS AKC PgDip
King’s College HospitalNeuro-ICU
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Learning Objectives
• To understand the pathophysiology behind subarachnoid haemorrhage • To understand the steps taken to diagnose subarachnoid haemorrhage • To understand the treatment options for SAH
• To understand the ICU management of SAH
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True or False? q1
1. The following are risk factors for a poor outcome post aneurysmal subarachnoidhaemorrhage (SAH):a. Male sexb. Presence of co-morbid conditionsc. Anterior circulation aneurysmd. World Federation of Neurosurgeons (WFNS) grade IV
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True or False? q2
2. Proven therapies in the management of vasospasm include:a. Triple H therapyb. Oral nimodipinec. Antifibrinolyticsd. Balloon angioplasty
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True or False? q3
3. The following statements are true:a. The ISAT study demonstrated a better outcome for coiled versus clippedaneurysmsb. The overall case mortality for SAH is 10%c. Intraoperative hypothermia improves neurological outcomed. CT is 100% sensitive in detecting aneurysms
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Pathophysiology of SAH
• SAH may be spontaneous or traumatic • Spontaneous SAH are caused by Cerebral aneurysms ,AV malformations • Uncommon causes – neoplasms, dural AVM, venous angiomas, infectious aneurysms
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Epidemiology of SAH• Incidence about
10/100,000/yr• Mean age of onset 51
years• 55% women
• men predominate until age 50, then more women
• Risk factors• cigarette smoking• hypertension• family history
800-900 patients undergo either endovascular coiling or surgical clipping each year in England
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Case fatality rates for SAH• Population-based study in England • 24 hour mortality: 21%• 7 days: 37%• 30 days: 44%• Relative risk for patients over 60 years vs. younger = 2.95• NCEPOD : 25 % survival
Pobereskin JNNP 2001;70:340-3
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Aneurysms
- 1-2% of the population have unrupturedaneurysms
- larger >1cm aneurysms :more likely
- Women>Men
- incidence increases linearly with age
- 10-15% of patients presenting with SAHhave multiple aneurysms
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Common sites of aneurysms within the cerebral circulation. ACA - anterior cerebralartery; A com – anterior communicating artery; ICA – internal carotid artery; P comm. –posterior communicating artery; BA – basilar artery.
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Clinical presentation
• “Worst headache in my life”• Neck stiffness• Photophobia• Often accompanied by a period of
unconsciousness • 50% do not awaken
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diagnosis
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Risk factors
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On Examination
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Investigation
• CT Brain without contrast Sensitivity decreases with time from onset
• CT scan is 90% sensitive within the first 24 hours• 80% sensitive at 3 days • 50% sensitive at 1 week
• CT also can detect intracerebral hemorrhage, mass effect, and hydrocephalus.
• A falsely negative CT scan can result from small-volume SAH.
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Interpreting the CT• Distribution of SAH can provide information about the location of an aneurysm and prognosis
– Intraparenchymal hemorrhage may occur with MCA & PCAaneurysms.
– Interhemispheric and intraventricular hemorrhagesmay occur with ACA aneurysms.
Outcome is worse for patients with extensive clots inbasal cisterns than for those with a thin diffusehemorrhage
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Diffuse SAH
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MCA territory SAH
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Florid SAH with early hydrocephalus
(ACLS text)
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More subtle subarachnoid haemorrhage
interhemispheric fissure
Sylvian fissure
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Negative CT but suspicious hx• If the history is strongly suggestive the CT is negative LP • Xanthochromia is a classic sign, but not present early on
• Angiography CT A or MRA to define the source of the bleed
• If multiple aneurysms : treatment targeted towards aneurysm
• adjacent to largest blood collection
• Sometimes there may be difficulty identifying the source
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Clinical Grading Scales for SAH .../cont’d
Grade Description
World Federation of Neurological Surgeons Scale1 Glasgow coma scale 15, no motor deficit2 GCS 13 to 14, no motor deficit3 GCS 13 to 14, with motor deficit4 GCS 7 to 12, with or without motor deficit5 GCS 3 to 6, with or without motor deficit
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Complications
Hydrocephalus first 24 hours -obstruction of CSF outflow in the ventricular system by clot
Rebleeding of SAH occurs in 20% of patients in the first 2 weeks. Peak incidence rebleeding = 1 day post SAH
- This may be from lysis of the aneurysmal clot
Vasospasm from arterial smooth muscle contraction is symptomatic in 36% of patients.
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Complications• Neurologic deficits from cerebral ischemia peak at days 4-12.
• Hypothalamic dysfunction causes excessive sympathetic stimulation myocardial ischemia or labile BP
• Hyponatremia may result from cerebral salt wasting/ SIADH
• Pulmonary oedema – neurogenic and nonneurogenic
• HAP/VAP
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Hydrocephalus• Caused by obstruction of CSF flow by clotted blood• Can occur early (EVD) or late (VP shunt)• Careful with drainage – reduction in ICP can increase the risk of rebleeding
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SAH + Hydrocephalus • Temporal horns dilated• diffuse SAH • Blood in the 4th ventricle• Diffuse cerebral oedema
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Rebleeding
• Within first 24 hours• Up to 20% of patients rebleed within 2
weeks• Main preventative measure is control of
blood pressure – beta blockers• Alternatively early clipping of the
aneurysm allows hypertensive and hypervolemic therapy to prevent vasospasm
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Focus of Treatment in SAH
• Identifying and Rx causative lesion
•preventing re-bleeding
• Rx hydrocephalus
• Rx and preventing vasospasm
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So Early or Delayed Surgery
• Early clipping – less rebleeding• But higher incidence of vasospasm
Worst time is day 7 to 10 (highest time for vasospasm)
So – before 3 days, after 10 days
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Clip vs Coiling
• International Subarachnoid Aneurysm Trial(ISAT) Lancet 2002
• 2143 patients randomized to NS• clipping (n=1070) or endovascular coiling(n=1073)• Outcomes 1 year• 23.7% dependent or dead at 1yr coiled • 30.6% dependent or dead at 1 y clipped
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Basilar artery aneurysm
before coiling
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Basilar artery aneurysm
after coiling
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Calcium Channel Blockers
• Nimodipine 60mg q6h x 24d• Reduces:– Neurologic deficit– Cerebral infarction– Mortality
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Blood Pressure Control
• Maintain systolic BP >130mmHg• Use vasopressors if necessary – tomaintain CPP, and reduce ischemicpenumbra from vasospasm• Generally avoid vasodilators (exceptcalcium channel blockers)
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Initial angiogramRepeat angiogram
showing vasospasm (small arrows)
Vasospasm in acute SAH
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Vasospasm
•Up to 33%• Delayed until 48-72 h post SAH until 14d• Associated with larger clots and increasingage• Caused by local blood products• Compensated for by increase in BP tomaintain supply of nutrients• Nimodipine / nicardipine
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The Fisher Grading of SAH as Demonstrated by CT scan(Relation of Cerebral Vasospasm to Subarachnoid Hemorrhage Visualized by Computerized Tomographic Scanning. CM Fisher et al. Neurosurgery, 6:1-9, 1980)
Group (Grade)12
3
4
DescriptionNo blood detectedA diffuse deposition or thin layer with all vertical layers of blood (interhemispheric fissure, insular cistern, ambient cistern) less than 1 mm thick)Localized clots and/or vertical layers of blood 1 mm or greater in thicknessDiffuse or no subarachnoid blood, but with intracerebral or intraventricular clots
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Summary of the Relationship between the Amount of Subarachnoid Blood and the Development of Vasospasm(CM Fisher et al. Neurosurgery, 6:1-9, 1980)
VASPSPASM
SubarachnoidBlood
No.Cases None
Slight-Moderate Severe
Signs ofSevere Vasospasm
None 11 7 2 2 0
Diffuseonly
7 4 3 0 0
Clot or ThickLayer
24 0 1 23 23
Diffuse orNone, withCerebral ofVentricularBlood
5 3 2 0 0
TOTAL 47 14 8 25 23
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Vasospasm HHH Therapy• Haemodilution– Hct 30-35%
• Hypertension– Noradrenaline– BP titration to CPP/exam
• Hypervolemia Colloid/crystalloid
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True or False? q1
• 1. The following are risk factors for a poor outcome post aneurysmal subarachnoid
• haemorrhage (SAH):• a. Male sex• b. Presence of co-morbid conditions• c. Anterior circulation aneurysm• d. World Federation of Neurosurgeons
(WFNS) grade IV
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• FTFT• Aneurysms are more common in females,
sex does not alter survival outcome. Risk• factors for an unfavourable outcome are;
age, poor neurological condition on admission,
• posterior circulation/>10mm size, comordity especially hypertension, blood in
• subarachnoid space on CT.
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True or False? q2
•2. Proven therapies in the management of vasospasm include:
•a. Triple H therapy•b. Oral nimodipine•c. Antifibrinolytics•d. Balloon angioplasty
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• 2. FTFF• Triple H therapy is often used for symptomatic
vasospasm, but has not been proven to be• effective. There is no evidence that balloon
angioplasty is better than medical treatment.• There is level 1 evidence that commencing oral
nimodipine at admission in all cases of• SAH will decrease development of vasospasm.
Antifibrinolytics (potential to decreases• rebleeding) do not improve outcome and may
increase thromboembolic risk.
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• 3. TFFF• The outcome advantage for coiling comes from level 1
evidence, note it included patients• in mostly good neurological condition who had to be deemed
suitable for both treatments.• The overall fatality is nearer 50%. Mild intraoperative
hypothermia did not improve• outcome in the IHAST trial. CT may miss small/delayed
presentation SAH, and therefore• lumbar puncture may be indicated in some patients before the
diagnosis can be excluded.
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True or False? q3
• 3. The following statements are true:• a. The ISAT study demonstrated a better
outcome for coiled versus clipped• aneurysms• b. The overall case mortality for SAH is 10%• c. Intraoperative hypothermia improves
neurological outcome• d. CT is 100% sensitive in detecting aneurysms
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Colice 1985
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• http://www.ncepod.org.uk/2013report2/downloads/Managing%20the%20Flow_FullReport.pdf
• Relation of Cerebral Vasospasm to Subarachnoid Hemorrhage Visualized by Computerized Tomographic Scanning. CM Fisher JP Kistler and JM Davis. Neurosurgery, 6:1-9, 1980
• Stroke Association. 2013. Stroke Statistics. www. stroke.org.uk • VanGijn J, Kerr R and Rinkel, JE. 2007. Subarachnoid
haemorrhage. The Lancet: 369(9558); 306-318• VanGijn J and Rinkel JE. 2001. Subarachnoid haemorrhage:
diagnosis, causes and management. Brain: 124; 249-278 •
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Complications of aneurysmal SAH
• rebleeding• cerebral vasospasm• volume disturbances• osmolar disturbances• seizures
• arrhythmias and other cardiovascular complications
• CNS infections• other complications
of critical illness
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Critical care issues: rebleeding
• Unsecured aneurysms:• 4% rebleed on day 0• then 1.5%/day for next 13 days [27% for 2 weeks]
• Antifibrinolytic therapy (e.g., aminocaproic acid)• may be useful between presentation and early surgery
• Blood pressure management• labetalol, hydralazine, nicardipine
• Analgesia• Minimal or no sedation to allow examination
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Critical care issues: vasospasm and delayed ischemic damage
• Potential mechanisms• oxyhemoglobin/nitric oxide• endothelins
• Diagnosis• clinical• transcranial Doppler flow velocity monitoring• electrophysiologic• radiologic
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Critical care issues: vasospasm and delayed ischemic damage•Prophylaxis
• clot removal• volume repletion
• prophylactic volume expansion not useful• nimodipine 60 mg q4h x 14 days
• relative risk of stroke reduced by 0.69 (0.58-0.84). • nicardipine 0.075 mg/kg/hr is equivalent
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Critical care issues: vasospasm and delayed ischemic damage• Potential neuroprotective strategies
• tirilizad mesylate is an effective neuroprotectant in SAH, approved in 13 countries but not the US
• N-2-mercaptopropionyl glycine (N-2-MPG), approved for prevention of renal stones in patients with cysteinuria
• AMPA antagonists (e.g., topiramate)• NMDA antagonists (e.g., ketamine)
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Critical care issues: vasospasm and delayed ischemic damage• Management
• volume expansion• induced hypertension• cardiac output augmentation
• dopamine or dobutamine• intra-aortic balloon pump
• angioplasty• papaverine• erythropoetin?
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Critical care issues: neurogenic pulmonary edema• Symptomatic pulmonary edema occurs in about
20% of SAH patients• detectable oxygenation abnormalities occur in 80%
• Potential mechanisms:• hypersympathetic state• cardiogenic pulmonary edema• neurogenic pulmonary edema
• Management
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Neurogenic pulmonary edema in SAH
• radiographic pulmonary edema occurs in about 23% of SAH patients• up to 80% have elevated AaDO2
• a minority of cases are associated with documented LV dysfunction or iatrogenic volume overload
• neurogenic pulmonary edema appears to be a consequence of the constriction of pulmonary venous sphincters• requires neural control; in experimental models, does not
occur in denervated lung
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Neurogenic pulmonaryedemaafter SAH
PCWP=12CI=4.2
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Conditions associated with neurogenic pulmonary edema
• Common:• subarachnoid
hemorrhage• status epilepticus• severe head trauma• intracerebral
hemorrhage
• Rare:• brainstem infections• medullary tumors• multiple sclerosis• spinal cord infarction• increased ICP from a
variety of causes
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Mechanisms of neurogenic pulmonary edema• hydrostatic: CNS disorder produces a hypersympathetic state,
raising afterload and inducing diastolic dysfunction which cause hydrostatic pulmonary edema• 5/12 patients had low protein pulmonary edema
• (Smith WS, Mathay MA. Chest 1997;111:1326-1333)• Consistent with either neurogenic or cardiogenic
hypotheses
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Mechanisms of neurogenic pulmonary edema• neurogenic: contraction of postcapillary venular
sphincters raises pulmonary capillary pressure without raising left atrial pressure• Abundant experimental evidence of neurogenic
mechanism• Clinical evidence mostly inferred from low PCWP and
early hypoxemia• structural: ‘fracture’ of pulmonary capillary
endothelium
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Colice 1985
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Managing neurogenic pulmonary edema• acute subarachnoid hemorrhage patients do not tolerate
hypovolemia• volume depletion doubles the stroke and death rate due to
vasospasm
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Seizures in SAH patients
• about 6% of patients suffer a seizure at the time of the hemorrhage• distinction between a convulsion and decerebrate posturing
may be difficult • postoperative seizures occur in about 1.5% of patients despite
anticonvulsant prophylaxis • remember to consider other causes of seizures (e.g., alcohol
withdrawal)
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Seizures in SAH patients• patients developing delayed ischemia may seize following
reperfusion by angioplasty• late seizures occur in about 3% of patients
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Seizure management in SAH• seizures in patients with unsecured aneurysms may
result in rebleeding, so prophylaxis (typically phenytoin) is commonly given
• even a single seizure usually prompts a CT scan to look for a change in the intracranial pathology• additional phenytoin is frequently given to raise the serum
concentration to 20+ ug/mL• lorazepam to abort serial seizures or status
epilepticus
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DVT in the SAH patient
• even after the aneurysm is secured, there is probably a risk of ICH in postoperative patients for 3 -5 days• therefore, we usually place IVC filters for DVTs
• we also use IVC filters for unsecured aneurysm patients• angioplasty patients can probably be anticoagulated
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Nutrition in the SAH patient
• no useful clinical trials available• hyperglycemia may worsen the outcome of delayed
ischemia• ketosis appears to protect against cerebral ischemic
damage in experimental models• if patients are not fully fed during the period of
vasospasm risk, trophic feeding may be useful, and GI bleeding prophylaxis should be given
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Critical care issues: other medical complications• Cardiac (almost 100% have abnormal ECG)
• QT prolongation and torsade de pointes• left ventricular failure
• Pulmonary• pneumonia• ARDS• pulmonary embolism (2% DVT, 1% PE)
• Gastrointestinal• gastrointestinal bleeding (4% overall, 83% of fatal SAH)