Clotting Basics & Virchow’s Triad
Clue: This term describes a blood clot that forms in a blood vessel and stays where it formed.
Answer: What is a thrombus?
Clue: A DVT most commonly forms in these veins of the body.
Answer: What are the deep veins of the legs (e.g., calf or thigh)?
Clue: A pulmonary embolism (PE) occurs when a clot, usually from this location, travels and lodges in the pulmonary arteries.
Answer: What is a deep vein in the legs or pelvis (a DVT)?
Clue: This class of drugs is used to prevent new clots from forming and to stop existing clots from growing, but does not actively dissolve clots.
Answer: What are anticoagulants?
Clue: Disseminated intravascular coagulation (DIC) involves both excessive clotting and bleeding. What happens to platelets and clotting factors in DIC?
Answer: What is: they are consumed by widespread microclotting, leading to depletion of platelets and clotting factors and resulting in bleeding?
Clue: Venous thromboembolism (VTE) includes two related conditions involving clots in the venous system. Name them.
Answer: What are deep vein thrombosis (DVT) and pulmonary embolism (PE)?
Clue: Name one classic sign or symptom of a lower‑extremity DVT.
Answer: What is unilateral leg swelling, pain or tenderness, warmth, redness, or a feeling of heaviness in the leg (any one)?
Clue: Name two common symptoms of an acute pulmonary embolism.
Answer: What are sudden shortness of breath, pleuritic chest pain, tachycardia, cough ± hemoptysis, anxiety, or low oxygen saturation (any two)?
Clue: Name one common laboratory test used to monitor clotting or anticoagulation status in patients.
Answer: What is PT/INR, aPTT, platelet count, or fibrinogen (any one)?
Clue: Name one clinical situation that can trigger DIC.
Answer: What is severe sepsis, major trauma, obstetric complications (e.g., placental abruption, amniotic fluid embolism), or severe transfusion reactions (any one)?
Clue: Virchow’s triad describes three major factors that promote venous thrombosis. Name any two of the three.
Answer: What are venous stasis, endothelial (vessel wall) injury, and hypercoagulability? (Any two.)
Clue: Post‑operative and immobile patients are at high risk for DVT. Name two nursing interventions to help prevent DVT in these patients.
Answer: What are: early ambulation, leg exercises, compression stockings, intermittent pneumatic compression devices, adequate hydration, or administering prophylactic anticoagulants as prescribed (any two)?
Clue: In a PE, some areas of lung are ventilated but not perfused. What type of V/Q problem does this create, and how does it affect oxygenation?
Answer: What is a high V/Q ratio or increased dead space (ventilation without perfusion), which reduces effective gas exchange and leads to hypoxemia?
Clue: Patients on anticoagulants are at risk for bleeding. Name one nursing assessment that helps detect early signs of bleeding.
Answer: What is checking for bruising or petechiae, monitoring gums and nose for bleeding, checking urine/stool for blood, monitoring neurologic status for headache or confusion, or trending hemoglobin/hematocrit (any one)?
Clue: In obstetrics, DIC can be a serious complication of certain pregnancy‑related conditions. Name one pregnancy‑related situation where DIC may occur.
Answer: What is placental abruption, severe preeclampsia or HELLP syndrome, retained dead fetus, or amniotic fluid embolism (any one)?
Clue: Give one clinical example or situation that contributes to venous stasis as part of Virchow’s triad.
Answer: What is prolonged immobility or bedrest, long‑haul travel, heart failure, obesity, or paralysis (any one)?
Clue: In an immobile surgical patient, explain how lack of activity contributes to DVT formation in terms of venous blood flow.
Answer: What is: lack of muscle contraction in the legs reduces the “muscle pump” that normally returns venous blood to the heart, causing venous pooling and stasis, which promotes clot formation?
Clue: You suspect a postoperative patient has a new PE. Name two priority nursing actions in the first few minutes while awaiting medical evaluation.
Answer: *What are:
Clue: Give one rationale for why a patient with a confirmed DVT or PE is started on anticoagulation, even though the body may eventually break down the clot on its own.
Answer: What is: anticoagulation prevents the existing clot from enlarging and reduces the risk of new clots or additional emboli, giving the body time to naturally dissolve the current clot and reducing life‑threatening complications?
Clue: A patient with sepsis begins to show signs of DIC. Name one sign of microvascular clotting and one sign of bleeding you might see.
Answer: *What is:
Clue: A pregnant patient on bedrest after surgery has several VTE risk factors. Match each factor to a Virchow’s triad component: pregnancy‑related increased clotting factors, strict bedrest, and recent surgery to the pelvic area.
Answer:
Clue: A postoperative patient suddenly complains of new calf pain and unilateral swelling. Describe two nursing actions you should take immediately.
Answer: *What are:
Clue: A large PE can cause acute right ventricular strain and shock. Briefly explain how a large PE can lead to hypotension and possible cardiovascular collapse.
Answer: What is: the clot blocks blood flow through part of the pulmonary arterial bed, increasing pulmonary vascular resistance; the right ventricle struggles to pump against this sudden high pressure, reducing blood flow to the left heart, decreasing cardiac output, and causing systemic hypotension and potential shock?
Clue: In a patient being treated for PE with anticoagulants, describe one priority assessment related to effectiveness of therapy and one related to safety.
Answer: *What is:
Clue: Explain why a patient with DIC may be treated with both measures that support clotting (such as platelets or plasma) and interventions that reduce further clot formation (such as heparin in selected cases).
Answer: What is: because DIC involves uncontrolled clotting and consumption of platelets and factors, patients both clot and bleed; replacement of platelets/factors treats life‑threatening bleeding, while careful use of anticoagulants in some cases can slow ongoing microvascular clotting and help preserve organ function?