Vascular bed disorders (vasopathies)
Inflammatory or structural changes in the vascular wall lead to the vasculitic-purpuric type of bleeding. It is characterized by symmetric rashes, which are often combined with signs of systemic inflammation.
A typical example is hemorrhagic vasculitis (Henoch-Schönlein purpura), which predominantly affects young adults. It begins acutely with fever and intoxication, followed by the clinical picture of four syndromes:
- Cutaneous: confluent petechiae and purpura (up to necrosis) on the extensor surfaces of the legs.
- Articular: migratory pain or benign arthritis.
- Abdominal: intense abdominal pain with the risk of gastrointestinal bleeding (may precede the rash).
- Renal: development of glomerulonephritis, which largely determines the prognosis of the disease.
Hereditary vasopathies include Rendu-Osler-Weber teleangiectasia. In this pathology, thinned vessels of the mucous membranes bleed regularly (epistaxis, gastrointestinal bleeding), while coagulogram and platelet counts remain normal.
Thrombocytopenias and Thrombocytopathies
Defects in the cellular link of hemostasis manifest as the microcirculatory (petechial-macular) type of bleeding. Patients complain of unprovoked bruises, petechiae, and mucosal bleeding.
- Hereditary thrombocytopathies (e.g., Glanzmann thrombasthenia). Manifest from birth. Platelet counts are normal, but they are functionally impaired due to a glycoprotein defect. Any trauma causes immediate bleeding.
- Idiopathic thrombocytopenic purpura (Werlhof's disease). Triggered by infections or medications. Characterized by an isolated drop in platelets (while megakaryocytes are sufficient in the bone marrow, indicating their peripheral destruction). The most formidable, albeit rare, complication is intracranial hemorrhage preceded by severe headaches.
- Thrombocytosis. Excess platelets (over 1 million) lead to a paradoxical effect: cells clog the microvasculature, depleting hemostatic reserves and secondarily causing bleeding.
Plasma coagulopathies
Disorders in the plasma factor system lead to the hematomatous type of bleeding. Here, the severity of blood loss is completely disproportionate to the force of the sustained trauma. Deep intermuscular hematomas and joint hemorrhages (hemarthroses) are characteristic.
A classic example is hemophilia A and B. The disease debuts in childhood. A specific symptom is hemarthrosis, which ultimately leads to ankylosis (complete joint immobility). An important diagnostic marker: the primary vascular-platelet link is unaffected (platelets and endothelial tests are normal), but the coagulogram shows prolonged overall clotting time and aPTT.
Acquired coagulopathies also exist. For example, during the decompensation stage of liver cirrhosis, a complex hemorrhagic syndrome occurs. Parenchymal necrosis reduces the production of clotting proteins, and an enlarged spleen (congestive splenomegaly) actively destroys platelets, leading to severe epistaxis, uterine bleeding, and petechiae.
DIC syndrome and obstetric hemorrhage
Disseminated intravascular coagulation (DIC) syndrome is a nonspecific body reaction characterized by a severe microcirculatory disorder. Pathogenesis consists of two processes:
- Consumption coagulopathy: a large amount of tissue thromboplastin enters the blood, forming a mass of fibrin microclots. Clotting factors (fibrinogen, platelets) are consumed in the process, and the hemostatic potential drops critically.
- Pathological fibrinolysis: defense systems begin to destroy not only thrombi but also normal clotting factors circulating in the blood.
In obstetrics, DIC is often triggered by placental abruption (premature separation of a normally implanted placenta). In severe cases, Couvelaire uterus (uteroplacental apoplexy) develops. Due to high pressure, blood bursts into the thickness of the myometrium, infiltrating it all the way to the serous membrane. Placental tissue, rich in thromboplastin, enters the maternal circulation, triggering generalized intravascular coagulation.
Hematomatous — Deep — Hemophilia. In coagulopathies (like hemophilia), secondary hemostasis is impaired, so blood is not stopped by large clots and accumulates deep in muscles and joints, forming massive hematomas and hemarthroses.
Class and exam questions
What is the main difference in the coagulogram between hemophilia and thrombocytopathies?
In hemophilia, only the coagulation link is affected: clotting time and aPTT are prolonged, while the platelet count and primary bleeding time remain normal. In thrombocytopathies, conversely, the primary bleeding time is increased.
Why does hemorrhagic syndrome develop in liver cirrhosis?
The cause is multifactorial: the necrotic liver stops synthesizing plasma clotting factors, and portal hypertension leads to splenomegaly, causing the spleen to destroy its own platelets.
What is the mixed type of bleeding, and in which disease does it occur?
The mixed type combines features of microcirculatory (bruises, petechiae) and hematomatous (deep hemorrhages) bleeding. A classic example is von Willebrand disease, as this factor is responsible for both platelet adhesion and stabilization of factor VIII.
What else to study on this topic
- Diagnostic criteria for hemophilia: Factor VIII and IX levels
- Differential diagnosis of Henoch-Schönlein purpura and meningococcemia
- Von Willebrand disease: pathogenesis and clinical variants
- Pathogenesis of portal hypertension complications in liver cirrhosis
- Stages of DIC syndrome and principles of intensive care
Master the entire topic in the "Pathophysiology" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Hemorrhagic complications" and 4,913 other subject pages
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 135 video lessons on the subject
Free video lessons: pathophysiologyShort lessons with lecture notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.