Hemorrhage
Overview
Hemorrhage (출혈, hemorrhage) refers to the leakage of blood out of the vascular system due to damage to blood vessels or the heart. It can occur from various causes such as trauma, disease, or medical procedures, and ranges widely from minor bleeding to life-threatening massive hemorrhage depending on the amount, rate, and location of blood loss. If bleeding persists, it can lead to hypovolemic shock due to decreased blood volume, organ damage, and even death, making prompt hemostasis and treatment essential.
Main Content
1. Classification of Hemorrhage
Hemorrhage is classified as follows based on location and pattern.
1.1. Anatomical Classification
- Arterial hemorrhage: Bright red blood spurts in time with the pulse; hemostasis is most difficult and dangerous.
- Venous hemorrhage: Dark red blood flows continuously; pressure hemostasis is relatively effective.
- Capillary hemorrhage: Blood oozes out; most cases stop spontaneously or are controlled with mild pressure.
1.2. Classification by Location
- External hemorrhage: Blood exits the body due to damage to the skin or mucous membranes. Examples: wounds, nosebleeds, dental bleeding.
- Internal hemorrhage: Bleeding occurs in internal organs or tissues, pooling in body cavities (thoracic, abdominal, cranial cavities). Examples: gastrointestinal bleeding, cerebral hemorrhage, abdominal organ injury.
1.3. Classification by Blood Loss Volume
- Mild hemorrhage: Loss of less than 15% of total blood volume (approximately ≤750 mL). Vital signs maintained through compensatory mechanisms.
- Moderate hemorrhage: Loss of 15–30% (750–1500 mL). Symptoms include tachycardia, increased respiratory rate, pale skin.
- Severe hemorrhage: Loss of 30–40% (1500–2000 mL). Hypotension, decreased consciousness, shock occur.
- Massive hemorrhage: Loss of over 40% (>2000 mL). Immediate life-threatening, requiring emergency transfusion and surgery.
2. Causes of Hemorrhage
- Traumatic: Physical injury from traffic accidents, falls, stab wounds, gunshot wounds, fractures.
- Disease-related: Hemophilia, thrombocytopenia, liver cirrhosis (coagulation factor deficiency), gastric ulcer, aortic aneurysm rupture, tumors.
- Iatrogenic: Bleeding during surgery, use of anticoagulants (warfarin, heparin), invasive procedures (biopsy, catheter).
- Physiological: Menstruation, postpartum hemorrhage.
3. Symptoms and Signs
Symptoms of hemorrhage vary depending on the amount, rate, and location of bleeding.
- Local symptoms: Bleeding at wound site, hematoma, bruising, hematemesis, melena, hematuria, hemoptysis.
- Systemic symptoms: Dizziness, pallor, cold skin, tachycardia, hypotension, dyspnea, decreased consciousness, shock.
- Specific sites: Headache, vomiting, neurological deficits in cerebral hemorrhage; hematemesis and melena in gastrointestinal bleeding; dyspnea in thoracic hemorrhage.
4. Diagnostic Methods
- History taking and physical examination: Identify cause, pattern of bleeding, and vital signs.
- Blood tests: CBC (hemoglobin, hematocrit), platelet count, PT/aPTT (coagulation tests), blood type and cross-match.
- Imaging: Ultrasound (FAST), CT, MRI, angiography to locate internal bleeding.
- Endoscopy: Gastroscopy, colonoscopy for diagnosis and hemostasis of gastrointestinal bleeding.
5. Treatment and Hemostasis Methods
5.1. Basic First Aid
- Direct pressure: Apply clean gauze or cloth directly to the bleeding site.
- Elevation: Raise the bleeding area above heart level.
- Pressure point hemostasis: Compress arterial pressure points (brachial artery, femoral artery).
- Tourniquet use: Used restrictively for massive limb hemorrhage; time of application must be recorded.
5.2. Medical Treatment
- Medications: Hemostatic agents (tranexamic acid, vitamin K), anticoagulant antagonists, vasoconstrictors.
- Transfusion: Packed red blood cells, fresh frozen plasma, platelets, coagulation factors.
- Surgery: Ligation or suture of damaged vessels, embolization, partial organ resection.
- Endoscopic hemostasis: Clips, electrocautery, epinephrine injection.
- Interventional radiology: Embolization, stent placement.
6. Complications
- Hypovolemic shock: Decreased tissue perfusion due to reduced blood volume.
- Anemia: Iron deficiency anemia from chronic bleeding.
- Hematoma formation: Blood accumulation in tissues, risk of infection.
- Compartment syndrome: Increased pressure within fascia causing nerve and vascular damage.
- Disseminated intravascular coagulation (DIC): Coagulopathy from massive bleeding and transfusion.
- Organ damage: Brain injury in cerebral hemorrhage, ischemia in gastrointestinal bleeding.
Recent Trends
As of 2024–2025, the following major changes and trends are observed in hemorrhage management:
- Expanded use of tranexamic acid (TA): Large randomized clinical trials have shown that early administration of TA improves survival not only in traumatic hemorrhage but also in postpartum hemorrhage, surgical bleeding, and even head trauma. In 2024, the WHO updated its guidelines to strongly recommend TA administration within 3 hours for trauma patients.
- Advances in REBOA (Resuscitative Endovascular Balloon Occlusion of the Aorta): Evidence has accumulated that aortic balloon occlusion is less invasive and more effective than traditional thoracotomy for massive hemorrhage, leading to increased adoption in emergency departments and battlefield medicine. In 2025, the American College of Surgeons refined REBOA usage guidelines.
- Digital health and AI-based bleeding detection: Real-time bleeding detection systems using wearable devices and AI algorithms have been developed, entering the commercialization stage to quantify blood loss and provide early warnings during surgery or at trauma scenes.
- Innovations in hemostatic agents and dressings: New hemostatic gauzes and sponges based on chitosan, cellulose, and zeolite have been developed and introduced into military and civilian emergency medicine. In particular, the FDA expanded approval for the self-expanding hemostatic sponge (XStat) in 2024.
- Optimization of massive transfusion protocols (MTTP): Balanced transfusion at a 1:1:1 ratio (packed red blood cells: fresh frozen plasma: platelets) has become standard, and patient-tailored transfusion strategies (based on thromboelastography) are gradually being introduced in 2025.
- Telemedicine and hemorrhage management: Telemedicine programs enabling remote specialist-guided hemostasis in battlefields or disaster sites are expanding.
Related Topics
- [[Hemostasis]]
- [[Hypovolemic shock]]
- [[Hemophilia]]
- [[Trauma]]
- [[Blood transfusion]]
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