Deep Vein Thrombosis Flashcards
what is DVT?
formation of a clot in deep vein.
It is a type of VTE (Venous thromboembolism). Other type of VTE is Pulmonary embolism
what veins are most susceptible to DVT formation ?
veins located in the pelvis, lower leg (calf) and thighs
This includes superficial femoral, popliteal, posterior tibial & peroneal
DVTs tend to occur in the lower extremities (legs), but can occur in the upper extremities as well. However, DVTs in the lower extremities tend to have a higher chance of ……………
breaking off and turning into a PE (pulmonary embolism)
what makes a DVT so dangerous?
the potential for it to lead to pulmonary embolism
What factors play a role in the development of a DVT? To answer that question, we must review __________ __________
Virchow’s Triad.
Virchow’s Triad gives us three main factors that can lead to blood clot formation within a vein. Remember there are THREE factors (hence why it’s called a Triad).
Anyone can develop a deep vein thrombosis, especially if these risk factors are present.
Mnemonic for Virchow’s Triad
SHE
Stasis of Venous Circulation:
Hypercoagulability
Endothelial damage to the vein:
What would cause the blood in the venous system to become stagnant and not really move ?
the blood has to flow back to the heart via the veins, and it does this with the assistance of healthy vein valves and the muscles within the extremity. If the vein’s valves are damaged or the muscles aren’t working (or being used) blood isn’t going to flow back very well and a blood clot can develop.
when blood hangs out together for a while it starts to _____ together
stick cuz it has platelets in it
Blood cannot just hang out and become static within a vessel. If it does this the blood will start to clump up (due to the present of platelets) and form a clot.
What are some conditions that cause stasis of blood flow?
Immobilized
Varicose Veins (damaged valves allow blood backflow)
Surgery (hip or knee)
Traveling for long hours without moving extremities
Obstruction: late pregnancy, obesity
Heart failure (left ventricular dysfunction)
Atrial fibrillation
What are some conditions that cause an increased risk of forming a clot within the vessel?
Cancer Severe illness (sepsis) Dehydration Usage of Estrogen (birth control) Heparin Induced Thrombocytopenia (HIT) Postpartum Period
What are some conditions that cause damage the endothelial lining?
This endothelial is a layer of cells that lines the inside of the vein. Damage to this layer can be from a direct or indirect cause, but regardless it stimulates platelets and the coagulation process. So think of anything that damages the lining inside the vessel.
IV drug usage ( also venipuncture…drawing blood from a vein)
Indwelling devices (central line catheter, IV line, or heart valves etc.)
Medications that are damaging to the vein
Trauma or injury to the vessel (surgery)
Regardless of the factor(s) contributing to the blood clot, as identified by ________ Triad, platelets are involved.
The platelets start to collect at the edges of the vessel, usually within the _______- of the vein’s valve. Platelets normally help create a seal to stop the bleeding. So, when they start to work within the vessel it _________ other chemicals called clotting factors.
Clotting factors cause __________ to be created. Fibrin causes the big problem in terms of a clot developing because fibrin is like strands of mesh. This causes WBCs, RBCs, and platelets to ___________-within the vein.
This forms a clot and it continues to grow, which can eventually break off and enter venous circulation.
Virchow’s; cusps; recruits; fibrin; stick together
S/S of DVT
Redness
Swelling
Very warm
Pain
Homan’s Sign: NOT reliable for detecting a DVT because of false positives… but know for exams how to elicit a response:
Extend the patient’s leg and manually dorsiflex the patient’s foot (bend it up towards the shin). If it causes the patient pain, it considered a Positive Homan’s Sign.
How to test for Homan’s sign
Homan’s Sign: NOT reliable for detecting a DVT because of false positives… but know for exams how to elicit a response:
Extend the patient’s leg and manually dorsiflex the patient’s foot (bend it up towards the shin). If it causes the patient pain, it considered a Positive Homan’s Sign.
Nursing interventions for DVT: it can be diagnosed with
ultrasound