Skip to main content

Sources And Fate Of Arterial and Venous Emboli


Venous Emboli:

Sources Of Venous Emboli;

  • 95 % of venous emboli arise from  thrombi in deep veins of the leg ( that are deep calf, popliteal, femoral and iliac veins)
  • Rarely venous emboli arise from pelvic veins, inferior vena cava or elsewhere.
Some special types of venous emboli.
1. Saddle embolus.
              It refers to "large snake-like venous embolus that becomes coiled upon itself and impinges on bifurcation of the main pulmonary artery and sits astride the two major subdivisions of the pulmonary artery. such embolus is very dangerous and may cause pulmonary infarction. there is a point to be noted here that lungs also get partial blood supply from bronchial arteries which are branches of aorta hence, complete occlusion of the pulmonary artery is needed to cause pulmonary infarction.

2. Paradoxical Embolus.
         It refers to a venous embolus that enters from right side of the heart to the left side of the heart by passing through an intra-atrial or intra-ventricular defect and gains entry into the arterial system. such embolus is more dangerous than simple venous embolus because it may block larger arteries and may cause massive ischemia, infarction or heart failure.

Arterial Emboli:

Sources of Arterial Emboli.

1. Most commonly from intra-cardial mural thrombi
2. Mural thrombi in aortic aneurysm
3. overlying atherosclerosis plaques in the aorta
4. fragmentation of vegetations on the heart valve.

Fate Of Arterial Emboli:

Arterial emboli follow a shorter course because they travel through the vessels of progressively decreasing diameter, finally lodge in a vessel of smaller diameter than this emboli cause infarction of the organ supplied. for example, if emboli enter into the coronary artery, it causes myocardial infarction, similarly, occlusion of the cerebral artery will cause cerebral infarction.

Other Topic on emboli;


Popular posts from this blog

Human Parasites, Types of Parasites, and Classification

Parasite: A parasite is a living organism which gets nutrition and protection from another organism where it lives. Parasites enter into the human body through mouth, skin and genitalia. In this article, we will generally discuss the types and classification of parasites. It is important from an academic point of view. Those parasites are harmful, which derives their nutrition and other benefits from the host and host get nothing in return but suffers from some injury. Types of Parasites Ecto-parasite: An ectoparasite lives outside on the surface of the body of the host. Endo-parasite: An endo-parasite lives inside the body of the host, it lives in the blood, tissues, body cavities, digestive tract or other organs. Temporary parasite: A temporary parasite visits its host for a short period of time. Permanent parasite: Permanent parasite lives its whole life in the host. Facultative parasite: A facultative parasite can live both independently and dependently. It lives in the

How to taper off, wean off beta blocker, atenolol, Propranolol, Metoprolol

Beta blockers include, atenolol (Tenormin), propranolol (Inderal ) and metoprolol (Lopressor) and are used to treat high blood pressure, certain cardiac problems, migraine and few other conditions. People usually take atenolol, propranolol or metoprolol for many years as a treatment of high blood pressure or after having an episode of heart attack . Sometimes, it becomes necessary to withdraw these beta blockers due to their potential side effects that trouble the patients or sometimes doctor wants to change the drug and shift the patient to some other anti-hypertensive medicine. No matter whatever the cause is, whenever, a patient who has been using a beta blocker for a long period of time, and he needs to be stopped from further usage of that beta blocker, must not stop taking it. One should taper off the dose of a beta blocker. Now a question arises how to wean off or taper off a beta blocker? The method of tapering off beta blocker varies from individual to individual. Allow you

Difficulty in standing up from a sitting or squatting position, Causes & Solution

People who feel it difficult to stand up from a sitting or squatting position may have problem in one or more of the following structures. 1. Knee joint 2. Muscles of legs, thighs or buttock 3. Muscles of arms 4. Cerebellum Let’s now explain one by one, what kind of problems in above structures may cause difficulty in standing up from a sitting or squatting position. 1. How do problems in knee joints lead to difficulty in standing up? Knee joint is one of the primary and most affected joint that takes part in standing up. Other joints that take part are hip, ankle, knee, elbow, wrist and shoulder joint. Knee joint gets the most strain , and also knee joint is comparatively less supported. That’s why usually it’s the knee joint that starts to cry first because of arthritis. Knee joint arthritis causes long term knee pain , that makes the movement difficult at knee joint. Arthritis also makes the knee joint stiffer and slower and its range of motion also decreases. All these affects coll