b25-intracranial bypass graft...
TRANSCRIPT
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DISCLOSUREAmar Siyar, RVT
• No relevant financial relationship reported
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Ahmad SiyarVascular Ultrasound Technology
Diagnostic Ultrasound ProgramBellevue College
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SWEDISHSwedish Medical Center
Cherry Hill
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UW MedicineHarborview
Medical Center
_____________
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Clinical Instructor:Anne Moore
Supervisor; Cerebrovascular Lab Harborview Medical Center
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o Brain aneurysm statistics and factso Signs and symptomso Risk factorso Treatmento Types of graftso Equipment and transducerso Challenges to imagingo Case study (ECA-ICA Bypass Graft)o Study findingso References
Contents
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Brain Aneurysm Statistics and Facts in the US
o 6 million people have unruptured brain aneurysm, 1 in 50.
o 30 Thousand people suffer a brain aneurysm rupture every year.
o 66% of survivors suffer permanent neurological deficit.
o 15% die before reaching the hospital
o Most prevalent in people ages 35-60
o Larger than 1 inch are “giant” aneurysms – difficult to treat.
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Unruptured brain aneurysms are typically completely asymptomatic.These aneurysms are typically small in size, usually less than one half inch in diameter. However, large unruptured aneurysms can occasionally press on the brain or the nerves stemming out of the brain and may result in various neurological symptoms.
Warning Signs/Symptoms
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Unruptured brain aneurysms
o Localized Headacheo Dilated pupilso Blurred or double visiono Pain above and behind eyeo Weakness and numbness
o Difficulty speaking
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Ruptured brain aneurysmso Sudden severe headache, the worst headache of your lifeo Sudden blurred or double visiono Sudden pain above/behind the eye or difficulty seeingo Sudden change in mental status/awarenesso Sudden trouble walking or dizzinesso Sudden weakness and numbnesso Sensitivity to light (photophobia)o Loss of consciousnesso Nausea/Vomitingo Stiff Necko Seizureo Drooping eyelid
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Risk factors for brain aneurysm● Smoking and drug use● Hypertension ● Congenital artery wall abnormalities ● Family history of brain aneurysms● Age over 40● Gender, women compared with men at a ratio of 3:2● Disorders such as Ehlers-Danlos Syndrome, Polycystic Kidney Disease,
Marfan Syndrome, and Fibromuscular Dysplasia(FMD)● Presence of an arteriovenous malformation (AVM)● Infection● Tumors● Traumatic head injury● African-Americans and Hispanics at twice the rate of rupture of whites
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Treatment of brain aneurysmTo relieve symptoms and to prevent any subsequent strokes vascular surgeons and neurosurgeons try:
1. Improving collateral sources of flow:
a. endarterectomyb. angioplasty
c. stenting
2. Direct intervention:
a. traditional proceduresb. minimally invasive procedures.
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1. Improving collateral sources of flow:
o Patients with complete carotid occlusion can be asymptomatic due to adequate collateral system.
o However, patients with recent ischemic symptoms are at high risk for subsequent stroke because of hemodynamic impairment due to poor collateral flow.
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Traditional´Huntarian ligation ´Clipping ´Aneurysmorrhaphy´Wrapping ´ECA-ICA bypass
2. Direct Intervention:
Endovascular´Coiling´Stent-assisted coiling´ Pipeline stents´ Flow diversion stents
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A- Traditional
Clipping Wrapping
Huntarian ligation
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B- Endovascular
CoilingFlow diversion stent
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Pipeline stent Stent-assisted coiling
B- Endovascular
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Web device
B- Endovascular
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Extracranial to intracranial arterial bypass
o Extracranial-intracranial (EC-IC) bypass surgery is being increasingly used in the surgical management of cerebrovascular diseases, especially for the treatment of complex aneurysms not amenable to clipping and occlusive cerebrovascular disease.
o For this purpose either synthetic or autogenous grafts are used as conduit.
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Types of graftsDirect extracranial to intracranial arterial bypass of the ipsilateral external carotid artery is performed either by:
A. Superficial temporal artery (STA) bypass;
B. Radial artery (RAD) bypass graft;
C. Saphenous vein (SAPH) bypass graft; or
D. Anterior tibial artery (ATA) graft.
connecting external carotid artery (ECA) to one of the middle cerebral artery (MCA) branches.
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Graft anatomy
MCA - M2
Dist. AnastomosisAneurysm
Radial artery graft
Prox. Anastomosis Prox. ECA
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Bypass MapDistal MCARAD Graft
Proximal MCA
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Philips iU22
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Transducers
o Broadband S5-1 sector array transducer
o Hockey Stick L 15-7io Linear array transducer
o L 9-3 Linear array transducer
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Challenges to Imaginingo Penetration of bone layer in order to image cerebral
bed.o Patients’ limited maneuverability.o Intensive care equipment such as Intracranial pressure
monitors and drains.
o Patient cooperation. o Immediate post-op staples and bandages.
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Case studyo Immediate Post-Op duplex study
o Exam performed in October, 2017o Duration of the exam 45 - 60 minutes
o Inpatient setting
o Patient non-intubated and awake
o Vessels studied CCA, ECA, RAD graft, MCA, ACA, PCA
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Patient historyo Hypertension.
o Cerebrovascular accident. o Gastroesophageal Reflux Disease.
o 50-year previous smoker.o Chronic Obstructive Pulmonary Disease.
o No family history of aneurysm.
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History of present illnessA 67-year old male patient was admitted early September 2017.
Patient previously had a R MCA aneurysm rupture during attempted clipping in January 2017, causing hemorrhagic stroke with significant deficit followed by decompressive hemicraniectomy.
The significant deficit caused multiple large left MCA territory infarct.
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Pre-Op Angio
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o Palmar arch is assessed for patency.o Rad graft diameter is assessed.o The predetermined 22 cm segment of radial artery
is harvested.o Proximal RAD graft is end to side anastomosed to
the ECA.o Distal end of the graft is end to end to
anastomosed to MCA-M2.
Operative plan
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Post Op Angio
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Post Op Angio
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Left ECA
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Proximal Anastomosis
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Mid Graft - Volume Flow
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Transcranial Distal Graft
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Left MCA
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Preliminary findings1. Patent left ECA-MCA radial artery bypass graft with
averaged mid-graft volume flow measuring 78mL/minute.
2. Low velocities with antegrade flow left MCA.
4. Elevated pulsatility indices throughout the bypass graft and in the left MCA, ACA, PCA.
5. Normal velocity in PCA-P2.
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Follow upo Patient developed postoperative aspiration
pneumonia and pseudomeningocelehydrocephalus which complicated the course of the treatment.
o Patient responded well to the procedure and started the course of recovery.
o Patient was then discharged to rehabilitation.
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