disorders of the arterial system
DESCRIPTION
Disorders of the arterial system. Dr. Amanj Kamal F.I.C.M.S. Cardiovascular Surgery. Turn the mobile off. Questions at the end. Anatomy. Main function of the arteries. Sizes; L, M, S. and Arteriols Wall composition according to sizes. (more elastic in large ones). Collaterals . - PowerPoint PPT PresentationTRANSCRIPT
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Disorders of the arterial system
Dr. Amanj KamalF.I.C.M.S. Cardiovascular Surgery
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Turn the mobile offQuestions at the end
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AnatomyMain function of the arteries.Sizes; L, M, S. and ArteriolsWall composition according to sizes. (more
elastic in large ones)
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Collaterals They are;Most organs got itSome not, (heart, kidney, retina). End
arteries.Eg. Subclavian arteryTime and chronicity
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Physiology
Lamina
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Intima as organ? 1%, surface areaGrowth promotion and inhibition, Vasoconstriction and vasodilation, Blood cell adherence and nonadherence, Anticoagulation and procoagulation.
Smooth muscle cellsMajor bulkMechanical and structural supportProteoglycans.
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Maintenance of vascular tone.Nitric oxide (NO), oxygen free radicals, endothelins,
angiotensinsCoagulation.Protien S, factor V, tissue factor, plasminogen
activators (and inhibitors)(PAs)(PAIs)Inflammatory and immunologic
response.The process of cell adherence, cell activation, and
cell migrationVascular wall modeling.platelet-derived growth factor (PDGF), and insulin-
like growth factor 1 (IGF-1).
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Arterial Substitutes
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IntroductionLast 5o years of increased vascular surgery.In US: 350,000 synthetic, 200,000 autogenous
vein/yr.
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The optimal arterial substitute should be: Strong, inexpensive, and lasting for the life of the
patient; Easily and permanently attachable to the host
vessel; Biocompatible, and nonthrombogenic luminal
surface; Resist infection; Available in appropriate sizes; Remain patent without intervention; Have viscoelastic properties similar to those of a
normal artery.
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The optimal arterial substitute should not: Leak blood or serous fluid Degenerate chemically or physically with
time; Undergo abnormal proliferative responsePromote thrombus formation or be a source of
emboliOcclude when flexed.Damage blood components.
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Arterial substitute evaluationPrimary patency,Secondary patency,Assisted primary patency, effectiveness of
follow up.
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Allografts
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Arterial allograftsWere the first widely used.Early results were encouraging.viability was not essential for successful
grafting.With ages (few yr.s loss of collagen, elastin …)Disappointing long term.High incidence of compoications. (abandond)
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Saphenous Vein AllograftsHuman cadavers.Antigenic; immunologic rejection responseCryopreservation alone.Advances in immunosuppressionNo significant clinical application
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Umbilical Vein AllograftsFrom human umbilical cords.Glutaraldehyde, ethanol, polyester mesh
tube.High pressure and nonantigenic.Patency rates of 70% and 50% at 1 and 5
years.Degenerative changes, aneurysms, difficult to
implant, No longer
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Xenografts
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Xenografts Unmodified arterial xenografts 1950sProminent immunologic reactionTreating bovine carotid arteriesModified xenografts 1960sPoor long-term patency rates, 40% 3 to 6
yearsaneurysms occurred in 3% to 6% infection rate of 3% to 7%Hemodialysis
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Autografts
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Arterial AutograftsAdvantages: no infection, flexible, no
aneurysm, blood supply, …Disadvantage: shortCABGRadial and internal mammaryPatency rate. And spasm.Internal iliac artery for renal.
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Venous AutograftsMost successful and most clinically used.Saphenous vein, cephalic and brachial veins,
and superficial femoral and internal jugular veins
GSV; 70-80 cm, from to, valves, caliber…Types; Reverse, and In situ.patency of reversed 80-90% at 1 year, 55-
86% at 5 yearsreversed vein grafting is applicable to larger
numbers of patients,Occur; clamp stenosis, valve fibrosis, narrow
anast.
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Prosthetic grafts
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Textile GraftsConcept of :Mesh fabric would result in similar
healingWoven and knitted. Major differences Porosity Preclotting
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Polytetrafluoroethylene (PTFE) GraftsFlexible All sizesFor extra anatomical bypass.
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So grafts’ types:Allografts:
- Artery- Saphenous vein- Umbelical vein
Xenografts: Autografts:
- Artery- Vein
Prosthetic grafts- Textile- PTFE
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Complications of Prosthetic GraftingAnastomotic neointimal hyperplasia, Graft infection, Graft failure caused by fiber disruption or
stretching, Perigraft seromas, Anastomotic false aneurysms.
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PTFE
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PTFE
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Dacron
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Dacron
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Dacron
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Graft infection
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Any questions?