Embolism
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2008-07-10T08:00:33Z
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| DiseasesDB = 18165
| ICD10 = {{ICD10|I|74||i|70}}, {{ICD10|I|82||i|80}}, {{ICD10|O|88||o|85}}, {{ICD10|T|79|0|t|79}}-{{ICD10|T|79|1|t|79}}
| ICD9 = {{ICD9|444.9}}
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| MeshID = D004617
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In [[medicine]], an '''embolism''' occurs when an object (the '''embolus''', plural '''emboli''') migrates from one part of the [[body]] (through [[circulatory system|circulation]]) and causes a blockage ([[occlusion]]) of a [[blood vessel]] in another part of the body. The term was coined in 1848 by [[Rudolph Carl Virchow]].<ref>{{cite book|title=The Timetables of Science| first=Alexander| last=Hellemans| coauthors=Bryan Bunch| publisher=Simon and Schuster| location=New York, New York| year=1988| isbn=0671621300 |pages=317}}</ref> This is in contrast with a [[thrombus]], or [[clot]], which forms at the blockage point within a blood vessel and is not carried from somewhere else.
== Classification ==
There are different types of emboli, classified based on the embolic material:
* [[Thromboembolism]] - embolism of thrombus or blood clot.
* [[Fat embolism]] - embolism of fat droplets.
* [[Air embolism]] (also known as a gas embolism) - embolism of air bubbles.
* [[Septic embolism]] - embolism of pus containing bacteria.
* [[Tissue embolism]] - embolism of small fragments of tissue.
* [[Foreign body embolism]] - embolism of foreign materials such as talc and other small objects.
* [[Amniotic fluid embolism]] - embolism of amniotic fluid, foetal cells, hair or other debris that enters the mother's bloodstream via the placental bed of the uterus and triggers an allergic reaction.
The pathway of the embolus can be one of three types:
* Anterograde
* Retrograde
* Paradoxical
In anterograde embolism, the movement of emboli is in the direction of blood flow. In retrograde embolism, however, the emboli move in opposition to the blood flow direction; this is usually only significant in blood vessels with low pressure (veins) or with emboli of high weight. In [[paradoxical embolism]], also known as crossed embolism, an embolus from the veins crosses to the arterial blood system. This is generally only found with heart problems such as septal defects between the atria or ventricles.
== Pathophysiology==
{{Unreferencedsection|date=January 2008}}
In thromboembolism, the thrombus (blood clot) from a blood vessel is completely or partially detached from the site of thrombosis (clot). The blood flow will then carry the embolus (via blood vessels) to various parts of the body where it can block the lumen (vessel cavity) and cause vessel obstruction or occlusion. Note that the free moving thrombus is called an embolus.<ref>{{Citation
| last = Howland
| first = Richard D.
| last2 = Mycek
| first2 = Mary J.
| publication-date =
| title = Pharmacology
| edition = 3rd ed.
| series = Lippincott’s illustrated reviews
| publisher = Philadelphia : Lippincott Williams & Wilkins, c2006.
| page = 227
| isbn = 0781741181
}}</ref> A thrombus is always attached to the vessel wall and never freely moving in the blood circulation. This is also the key difference for pathologists to determine the cause of a blood clot, either by thrombosis or post-mortem blood clot. Vessel obstruction will then lead to different pathological issues such as blood [[stasis]] and [[ischemia]].
However not only thromboembolism will cause the obstruction of blood flow in vessels, but any kind of embolism is capable of causing the same problem.
Fat embolism usually occurs when endogenous (from sources within the organism) fat tissue escapes into the blood circulation. The usual cause of fat embolism is therefore the [[fracture]] of tubular bones (such as the [[femur]]), which will lead to the leakage of fat tissue within the bone marrow into ruptured vessels. There are also exogenous (from sources of external origin) causes such as intravenous injection of [[emulsions]].
An air embolism on the other hand is usually always caused by exogenic factors. This can be the rupture of [[alveoli]] and inhaled air can be leaked into the blood vessels. Other more common causes include the puncture of [[subclavian vein]] by accident or during operation where there is negative pressure. Air is then sucked into the veins by the negative pressure caused by thoracic expansion during inhalation phase of respiration. Air embolism can also happen during intravenous therapy, when air is leaked into the system (however this [[iatrogenic]] error in modern medicine is extremely rare).
Gas embolism is usually a common concern for deep sea divers because the gases in our blood (usually nitrogen and helium) can be easily dissolved at higher amount during the descend into deep sea. However when the diver ascends back to the normal atmospheric pressure, gases become insoluble causing the formation of small bubbles in blood. This is also known as [[decompression sickness]] or the Bends. This phenomenon is explained by [[Henry's Law]] in [[physical chemistry]].
The other embolisms are rather rare. Septic embolism happens when a purulent tissue ([[pus]] containing tissue) is dislodged from its original focus. Tissue embolism is a near equivalent to [[cancer]] [[metastasis]] which happens when cancer tissue infiltrates blood vessels and small fragments of them are released into the blood stream. Foreign body embolism happens when exogenous (''and only exogenous'') materials such as [[talc]] enters the blood stream and causes occlusion or obstruction of blood circulation. [[Amniotic fluid embolism]] is a rare complication of [[childbirth]].
== Clinical complications ==
{{Unreferencedsection|date=January 2008}}
Assuming a normal circulation, a thrombus or other embolus formed in a systemic [[vein]] will always impact in the lungs, after passing through the right side of the heart. This forms a [[pulmonary embolism]] that can be a complication of [[deep-vein thrombosis]]. Note that, contrary to popular belief, the most common site of origin of pulmonary emboli are the [[femoral vein|''femoral'' veins]], not the deep veins of the calf. Deep veins of the calf are the most common site of thrombi, not emboli origin.
Some congenital abnormalities of the circulation, especially septal defects (holes in the cardiac septum), allow an embolus from a systemic vein to cross into the arterial system and land anywhere in the body (which is known as [[paradoxical embolism]] or crossed embolism). The most common such abnormality is [[patent foramen ovale]], occurring in about 25 % of the adult population, but here the defect functions as a valve which is normally closed, because pressure is slightly higher in the left side of the heart. In certain circumstances, e.g. if patient is coughing just when an embolus is passing, passage to the arterial system may occur.
Emboli starting in the heart (from a thrombus in the [[left atrium]] secondary to [[atrial fibrillation]] or septic emboli from [[endocarditis]]) can cause emboli in any part of the body.
An embolus landing in the [[brain]] from either the [[heart]] or a [[carotid artery]] will likely cause an ischemic [[stroke]].
Emboli of [[heart|cardiac origin]] are also frequently encountered in clinical practice. Thrombus formation within the atrium in valvular disease occurs mainly in patients with [[mitral valve]] disease, and especially in those with [[mitral valve]] [[stenosis]] with [[atrial fibrillation]] (AF). In the absence of AF, pure mitral regurgitation has low incidence of thromboembolism.
Absolute risk of emboli in [[idiopathic]] AF depends on other risk factors such as increasing age, [[hypertension]], [[diabetes]], recent [[heart failure]], or previous [[stroke]].
Thrombus formation can also take place within the [[ventricle]]s, and it occurs in approximately 30% of anterior wall [[myocardial infarction]]s, compared to only 5% of inferior ones. Other risk factors include poor ejection fraction (<35%), size of infarct, as well as presence of AF. In the first three months after infarction, left ventricle [[aneurysm]]s have 10% risk of embolization.
Patients with [[prosthetic]] valves also carry a significant increase in risk of thromboembolism. Risk varies on the valve type (bioprosthetic or mechanical), the positon (mitral or aortic), and presence of other factors such as AF, left ventricular dysfunction, previous emboli, etc.
Emboli often have more serious consequences when they occur in the so-called "end-circulation": areas of the body that have no redundant blood supply, such as the [[brain]], [[heart]], and [[pulmonary embolism|lungs]].
==References==
{{Refimprove|date=January 2008}}
{{reflist}}
{{Vascular diseases}}
{{Pathology of pregnancy, childbirth and the puerperium}}
{{Consequences of external causes}}
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