Blood vessel conditions Flashcards
Laminar flow
normal condition for blood flow throughout the circulatory system, blood moving in parallel down the length of a blood vessel
Turbulent
flow is not linear, can be classified as chaotic.
Under conditions of high flow, such as from high blood pressure
Where does turbulent flow occur in
large arteries at branch points, in diseased and narrowed (stenotic or partially obstructed) arteries and across stenotic (a constriction or narrowing of a passage)
What increases the energy required to drive blood flow?
Turbulence, it increases the loss of energy in the form of friction, which generates heat
Thrombus
formation or presence of a blood clot in a blood vessel ie vein or artery
greek prefix of Thrombo meaning
lump or clump, or a curd or clot of milk
Causes of injury to the blood vessel walls can be
direct trauma ex. lacerations, smoking, turbulence from high blood pressure, infection, atherosclerosis
Plaques
fatty deposits that build up between the tunica intima and tunica media walls of the arteries and cause them to harden and narrow
Platelets
recruited to the injured area to form an initial plug
Fibrin
a protein that crosslinks with itself to form a mesh that makes up the final blood clot
Blood clots in an artery are called
arterial thrombi, caused when an artheroclerotic plaque ruptures and a clot forms at the rupture site
Occlude
completely or partially block the blood flow at that point (arterial thrombi), can cause a myocardial infarction/heart attack
Blood clotrs in a vein are called
venous thrombosis, can occur when a person becomes immobilized and muscles are not contracting to push blood back to the heart
Embolus
piece of material travelling in a BV that when it blocks the vessel is referred to as an emoblism
If a thrombus breaks loose and travels through the blood stream it is called
thromboembolus
When it blocks a vessel it is called
a thromboembolism
What other materials can emboli be made up of
fat gobules (eg cholesterol from an atherosclerotic plaque, bone marrow from a bone fracture) air bubble (from a syringe or caused by the bends /decompression sickness), infected materials (eg. from IV drug use, heart valve infections, septic thrombophelbitis), cancer, foreign substances
An embolism in the brain can cause a
transient ischemic attack (TIA) or ischemic stroke/cardiovascular accident (CVA), cerebrovascular infarction