Causes of stasis
The development of blood flow cessation in microvessels is associated with the impact of various pathological factors. The main etiological causes include:
- Severe infections.
- Various intoxications.
- Shock.
- Cardiopulmonary bypass.
- Exposure to physical factors, such as cold exposure in frostbite.
Pathogenesis and the sludge phenomenon
The central role in the development of the pathology is played by the sludge phenomenon (from English sludge).
The mechanism of development includes:
- Drop in the pressure gradient between the arterial and venous segments of the microvasculature.
- Marked alteration of the hemorheological properties in microvessels, characterized by adhesion and aggregation of erythrocytes.
The main consequences of sludge include severe hemodynamic disturbances, progressive tissue hypoxia and ischemia, increased vascular permeability in capillaries and venules, as well as the development of edema and plasmorrhagia.
Clinical and morphological significance
The significance of blood flow cessation is determined by two key factors: the localization of the pathological process and its duration.
- Acute stasis: in most tissues, it provokes reversible changes. However, in the brain, it can trigger severe and potentially fatal edema, clinically manifested as a coma.
- Prolonged stasis: leads to destructive changes, including multiple micronecroses of vascular walls and the appearance of diapedetic hemorrhages.
Briefly: answers to topical questions
What is prestasis and what is its role in the development of the pathology?
Prestasis is the slowing of blood flow preceding stasis. In the microvasculature during prestasis, a pendulum-like movement of blood may occur.
What changes occur in the vascular wall and blood during prolonged stasis?
Prolonged stasis leads to multiple micronecroses of the vascular walls and the development of diapedetic hemorrhages. Adhesion (aggregation) of erythrocytes is a characteristic of the sludge phenomenon, which plays a primary role in the development of stasis. Increased vascular permeability, plasmorrhagia, and edema are listed as consequences of the sludge phenomenon.
STASIS = Sticking of erythrocytes (sludge), Slowing (prestasis), Arrest of blood flow in microvessels, Outcome dependent on localization and duration.
Class and exam questions
What is prestasis?
Prestasis is the stage of blood flow slowing in microvessels that immediately precedes the full development of stasis.
What are the main causes of stasis?
Cessation of blood flow can be caused by infections, intoxications, shock states, cardiopulmonary bypass, and physical factors such as cold in frostbite.
Why is acute stasis in the brain particularly dangerous?
In the brain, acute stasis contributes to the development of severe, life-threatening edema, clinically manifested as a coma.
What else to study on this topic
- Microscopic view of stasis in cerebral vessels stained with hematoxylin and eosin
- Detailed analysis of changes in blood rheological properties in microvessels
- Mechanisms of plasmorrhagia and tissue edema formation
- Pathogenesis of diapedetic hemorrhages in prolonged stasis
- Features of the formation of vascular wall micronecroses
Master the entire topic in the "Pathological Anatomy" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Blood stasis" and 4,414 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 153 video lessons on the subject
Other topics in the section "Disorders of Blood and Lymph Circulation"
Free video lessons: pathological anatomyShort lessons with study notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.