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embolism, congestion and infarction

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الكلية كلية الطب     القسم  الامراض     المرحلة 3
أستاذ المادة حسين ناجي عبد الله الشمري       07/06/2017 13:10:40
Lecture –5
Dr.Hussein Naji Alshammary
Ass.Prof.Hematology
College of medicine /Babylon university
General pathology /3rd year
Embolism
Embolism: detached intravascular soli, liquid, or gaseous mass that is carried by the blood flow to a site distant from its point of origin and usually end by tissue infarction from opbstruction of blood flow.
Classification of Embolism;
A) Physical state:
1. solid: Detached atheroma, detached thrombus, tumor, parasite, bullets, bits of bone, canula.
2. Liquid: Fat globules, amniotic fluid.
3. Gas: Nitrogen embolism, intravenous injection, fluid and blood transfusion.



Eschemia
Ischemia; Local loss of oxygen supply to the tissue due to parial obstruction of blood vessels
Causes: 1. Intravascular (intraluminal); Thrombosis, atheroma, embolism.
2. Vascular wall: spasm, vasculitis.
3. extravascular causes: pressure by tumor, Pregnancy, surgical ligature.

Infartion
Area of necrosis caused by complete obstruction of blood flow, arterial or venous.
Type of infarction (morphology):
Red infarction: red color due to presence of hemorrhage (RBC) in the tissue . Usually occur in soft tissue and in organs with collateral circulation ( lungs, brain and intestine).
White infarction: No hemorrhage so the infracted tissue or organ appear pale- white color. Usually occur in solids organs like liver, heart, and muscles.


Hyperaemia/congestion
Disturbances of circulation is the mechanism of distribution and return of blood to and from tissues in a manner of circular movement. The most important disturbances in this mechanism generally are: hyperaemia (Passive and active), congestion, edema, shock, thrombosis, embolism and infarction.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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