Disseminated Intravascular Coagulation (DIC): NCLEX, HESI & ATI Review

Disseminated intravascular coagulation (DIC) is a high-yield, life-threatening hematologic emergency that frequently appears on NCLEX, HESI, and ATI exams. This note reviews the key pathophysiology, causes, labs, treatment priorities, and nursing care points you need to recognize and manage DIC confidently.

What Is DIC?

• DIC is a life-threatening disorder characterized by widespread activation of the coagulation cascade, causing simultaneous thrombosis and bleeding.
• It is always secondary to an underlying condition — never a primary disease.

Pathophysiology

• An underlying condition triggers systemic inflammation, releasing tissue factor and cytokines.
• Widespread clots form in small blood vessels, consuming clotting factors and platelets.
• The body activates fibrinolysis to break down the clots, producing fibrin degradation products (FDPs) that act as anticoagulants.
• The result: microvascular thrombosis and severe bleeding at the same time.

Memory trick: DIC = clots everywhere → consumes factors → bleeds everywhere.

Common Underlying Causes

• Sepsis (most common cause) — gram-negative and gram-positive bacterial infections
• Malignancy — acute leukemia (especially acute promyelocytic leukemia), pancreatic, lung, prostate cancer
• Obstetric complications — abruptio placentae, amniotic fluid embolism, HELLP syndrome
• Trauma — severe head injury, crush injuries, burns
• Massive transfusion — dilutional coagulopathy
• Vascular disorders — abdominal aortic aneurysm, giant hemangiomas

Clinical Presentation

Bleeding manifestations

• Petechiae, purpura, ecchymoses
• Bleeding from puncture or IV sites
• Epistaxis, gingival bleeding
• Hematuria, melena
• Intracranial hemorrhage — most serious bleeding complication

Thrombosis manifestations

• Acral cyanosis (fingers/toes turning blue)
• Skin necrosis, gangrene
• Deep vein thrombosis (DVT), pulmonary embolism (PE)
• Acute kidney injury and respiratory failure from microvascular thrombi

Hemodynamic

• Hypotension and shock from bleeding and systemic inflammation

Diagnostic Criteria — ISTH Scoring

• A total score ≥ 5 indicates overt DIC.

Diagnostic Tests

• D-dimer is the most sensitive test for DIC but is not specific.
• Schistocytes (helmet cells) are characteristic of microangiopathic hemolytic anemia.

Management

• First priority: treat the underlying cause (e.g., antibiotics for sepsis, delivery for placental abruption).
• Maintain ABCs, give oxygen, IV fluids, and correct hypotension.
• Platelet transfusion — when platelets <20,000 or for active bleeding.
• Fresh frozen plasma (FFP) — replaces clotting factors in active bleeding.
• Cryoprecipitate — given when fibrinogen <100 mg/dL.
• Heparin is generally NOT used in DIC because the patient is already bleeding.

Nursing Assessment

• Monitor for bleeding: petechiae, purpura, oozing from puncture sites, epistaxis, hematuria, melena.
• Monitor for thrombosis: acral cyanosis, skin necrosis, DVT (leg swelling/pain), PE (dyspnea, chest pain).
• Vital signs: watch for tachycardia and hypotension.
• Neuro checks: headache, confusion, focal deficits → possible intracranial bleed.
• Monitor for AKI (↓ urine output) and respiratory failure (dyspnea, hypoxia).

Nursing Interventions

• Apply pressure to puncture sites for 5–10 minutes.
• Avoid IM injections, rectal temperatures, suppositories, and enemas.
• Use a soft toothbrush and electric razor.
• Administer stool softeners to prevent straining.
• Implement fall precautions.
• Administer transfusions (platelets, FFP, cryoprecipitate) as ordered.

Patient Teaching

• Report any bleeding: petechiae, bruising, nosebleeds, blood in urine or stool.
• Report severe headache or confusion — possible intracranial bleed.
• Report leg swelling, pain, shortness of breath, or chest pain — possible thrombosis.
• Use a soft toothbrush and electric razor.
• Avoid NSAIDs, aspirin, and contact sports.

Common Exam Traps

• DIC causes simultaneous thrombosis AND bleeding — not one or the other.
• Sepsis is the most common cause.
• D-dimer is elevated but not specific.
• Schistocytes on peripheral smear are characteristic.
• First priority is treating the underlying cause, not the DIC itself.
• Heparin is generally not used in DIC.
• Transfuse platelets when <20,000 or for active bleeding.
• Cryoprecipitate is given for fibrinogen <100 mg/dL.

Key Takeaways

• DIC = widespread clotting and bleeding from consumption of clotting factors and platelets.
• Sepsis is the most common trigger; DIC is always secondary.
• Labs: ↓ platelets, ↑ PT/PTT, ↓ fibrinogen, ↑ D-dimer, schistocytes on smear.
• Top priority: treat the underlying cause and support ABCs.
• Replace what's missing: platelets (<20K), FFP (factors), cryoprecipitate (fibrinogen <100).
• Bleeding precautions: soft toothbrush, electric razor, no IM injections, pressure to puncture sites, avoid NSAIDs/aspirin.