Types of hemorrhages and their clinical presentation

1. Definition

Hemorrhage is the extravasation of blood from vessels into the extravascular space — blood escaping from the vascular system. Useful terms by location:

Term	Site of bleeding
Hematoma	Into tissue (localized mass of blood)
Hemoperitoneum	Abdominal (peritoneal) cavity
Hemothorax	Pleural space
Hemopericardium	Pericardial sac
Hematuria	Into the urine
Hematemesis	Vomiting of blood

2. Clinical course and consequences

• Acute bleeding — rapid/massive loss → hypovolemic shock.
• Chronic bleeding — slow, ongoing loss → continuous replacement of RBCs depletes iron stores → iron-deficiency anemia.
• Jaundice — hemolysis → hemoglobin enzymatically converted to bilirubin → hyperbilirubinemia.
• Hemosiderosis — local/systemic accumulation of hemosiderin (iron); generally causes no parenchymal damage.

3. Mechanistic classification

Type	Mechanism	Examples
Per rhexim	Rupture of the vessel wall (pressure change / trauma)	Apoplexia, epidural/subdural/subarachnoid hematoma, dissecting aorta
Per arrosionem	Erosion of the vessel from outside	Peptic ulcer, tumor erosion, IBD
Per diapedesim	Leakage through an intact but “leaky” wall	Thrombopathies, coagulopathies, vasculopathies

3a. Hemorrhagia per rhexim (rupture)

• Apoplexia — intracerebral bleed related to hypertension (BP >200 mmHg). Rupture of intraparenchymal vessels (basal ganglia, thalamus, pons) at Charcot–Bouchard microaneurysms; hyaline arteriolosclerosis makes vessels fragile. Rising ICP → tonsillar herniation through foramen magnum → cardiorespiratory failure → death.
• Subarachnoid hematoma — non-traumatic rupture of a saccular (berry) aneurysm of the circle of Willis → “jet-stream” arterial bleeding → sudden, excruciating headache (“worst of life”); typically 40–50 years.
• Subdural hematoma — tear of bridging veins; brain atrophy in the elderly stretches them. Acute (sudden trauma) vs chronic (repeated minor trauma, e.g. boxing → fibrosis → neurological symptoms).
• Epidural hematoma — skull fracture (temporal bone) ruptures the middle meningeal artery → blood separates dura from periosteum → lucid interval (conscious → unconscious → recovery → unconscious again).
• Esophageal varix rupture — portal hypertension from liver cirrhosis → dilated peri-esophageal shunts rupture → massive upper-GI bleed.

3b. Hemorrhagia per arrosionem (erosion)

• Peptic ulcer — aggressive gastric juice (HCl, pepsin) erodes mucosa and disrupts vessels.
• Inflammatory bowel disease — ulcerative colitis / Crohn’s ulcers erode mucosal vessels.
• Tumor erosion — neoplastic tissue invades and ruptures a vessel.

3c. Hemorrhagia per diapedesim (leakage)

Wall becomes leaky without a definitive lesion; RBCs penetrate through capillaries. Sized as:

• Petechiae — 1–2 mm
• Purpura — 3–5 mm
• Ecchymoses — large bruises on skin/visceral surfaces

Causes:

• Thrombopathies (platelet count <20,000/µL): aplastic anemia, bone-marrow infiltration (leukemia/metastasis), infection/sepsis, immune thrombocytopenia.
• Coagulopathies: cirrhosis/hepatic failure (↓ factors II, VII, IX, X), DIC (consumption), hemophilia A (factor VIII) / B (factor IX).
• Vasculopathies: hypoxia, infection, vitamin C deficiency (↓ collagen synthesis), vasculitis (e.g. Henoch–Schönlein purpura).

4. Laboratory work-up

• Bleeding time (~3–10 min) — overall primary hemostasis.
• Prothrombin time (PT) — extrinsic pathway (factors VII, X, V, prothrombin, fibrinogen).
• Platelet count — normal ~150–400 × 10⁹/L.

Differential diagnosis of skin hemorrhages: thrombocytopenia + prolonged PT → sepsis/DIC; thrombocytopenia + normal PT → ITP, aplastic anemia, marrow tumor; normal platelets + prolonged PT → factor deficiency; normal platelets + normal PT + prolonged bleeding time → platelet dysfunction; all normal → trauma.

💡 High-yield: Three mechanisms — per rhexim (rupture), per arrosionem (erosion), per diapedesim (leakage). Petechiae (1–2 mm) → purpura (3–5 mm) → ecchymoses. Epidural = middle meningeal artery + lucid interval; subdural = bridging veins; subarachnoid = berry aneurysm. PT screens factor deficiency; thrombocytopenia + DIC labs point to sepsis.