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Hemostasis

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342:, which helps promote vasoconstriction. The damaged vessels will constrict (vasoconstrict) which reduces the amount of blood flow through the area and limits the amount of blood loss. Collagen is exposed at the site of injury, the collagen promotes platelets to adhere to the injury site. Platelets release cytoplasmic granules which contain serotonin, ADP and thromboxane A2, all of which increase the effect of vasoconstriction. The spasm response becomes more effective as the amount of damage is increased. Vascular spasm is much more effective in smaller blood vessels. 371:. Platelets play one of major roles in the hemostatic process. When platelets come across the injured endothelium cells, they change shape, release granules and ultimately become ‘sticky’. Platelets express certain receptors, some of which are used for the adhesion of platelets to collagen. When platelets are activated, they express glycoprotein receptors that interact with other platelets, producing aggregation and adhesion. Platelets release cytoplasmic granules such as 301: 487:– This type of hemostasis approach is most commonly used in situations where proper medical attention is not available. Putting pressure and/or dressing to a bleeding wound slows the process of blood loss, allowing for more time to get to an emergency medical setting. Soldiers use this skill during combat when someone has been injured because this process allows for blood loss to be decreased, giving the system time to start coagulation. 508:– Gelatin sponges have been indicated as great hemostatic devices. Once applied to a bleeding area, a gelatin sponge quickly stops or reduces the amount of bleeding present. These physical agents are mostly used in surgical settings as well as after surgery treatments. These sponges absorb blood, allow for coagulation to occur faster, and give off chemical responses that decrease the time it takes for the hemostasis pathway to start. 383:. Adenosine diphosphate (ADP) attracts more platelets to the affected area, serotonin is a vasoconstrictor and thromboxane A2 assists in platelet aggregation, vasoconstriction and degranulation. As more chemicals are released more platelets stick and release their chemicals; creating a platelet plug and continuing the process in a 569:. It started with the realization that excessive bleeding inevitably equaled death. Vegetable and mineral styptics were used on large wounds by the Greeks and Romans until the takeover of Egypt around 332BC by Greece. At this time many more advances in the general medical field were developed through the study of Egyptian 573:
practice, which led to greater knowledge of the hemostatic process. It was during this time that many of the veins and arteries running throughout the human body were found and the directions in which they traveled. Doctors of this time realized if these were plugged, blood could not continue to flow
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Hemostasis occurs when blood is present outside of the body or blood vessels. It is the innate response for the body to stop bleeding and loss of blood. During hemostasis three steps occur in a rapid sequence. Vascular spasm is the first response as the blood vessels constrict to allow less blood to
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is associated with a defect in the ability of the body to create the platelet plug and the fibrin mesh that ultimately stops the bleeding. New research is concluding that the von Willebrand disease is much more common in adolescence. This disease negatively hinders the natural process of Hemostasis
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Hemostasis can be achieved in various other ways if the body cannot do it naturally (or needs help) during surgery or medical treatment. When the body is under shock and stress, hemostasis is harder to achieve. Though natural hemostasis is most desired, having other means of achieving this is vital
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Vasoconstriction is produced by vascular smooth muscle cells, and is the blood vessel's first response to injury. The smooth muscle cells are controlled by vascular endothelium, which releases intravascular signals to control the contracting properties. When a blood vessel is damaged, there is an
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stick together to form a temporary seal to cover the break in the vessel wall. The third and last step is called coagulation or blood clotting. Coagulation reinforces the platelet plug with fibrin threads that act as a "molecular glue". Platelets are a large factor in the hemostatic process. They
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are often used to close an open wound, allowing for the injured area to stay free of pathogens and other unwanted debris to enter the site; however, it is also essential to the process of hemostasis. Sutures and ties allow for skin to be joined back together allowing for platelets to start the
605:, and Von Willebrand factor concentrates. Current research is trying to find better ways to deal with this disease; however, much more research is needed in order to find out the effectiveness of the current treatments and if there are more operative ways to treat this disease. 462:
alone would not be very effective. Medical professionals continue to debate on what the best ways are to assist a patient in a chronic state; however, it is universally accepted that hemostatic agents are the primary tool for smaller bleeding injuries.
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is the most popular choice among surgeons because it attracts the patient's natural platelets and starts the blood clotting process when it comes in contact with the platelets. This topical agent requires the normal hemostatic pathway to be properly
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surface. It takes approximately sixty seconds until the first fibrin strands begin to intersperse among the wound. After several minutes the platelet plug is completely formed by fibrin. Hemostasis is maintained in the body via three mechanisms:
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Debates by physicians and medical practitioners still continue to arise on the subject of hemostasis and how to handle situations with large injuries. If an individual acquires a large injury resulting in extreme blood loss, then a
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out of the body. Nevertheless, it took until the invention of the printing press during the fifteenth century for medical notes and ideas to travel westward, allowing for the idea and practice of hemostasis to be expanded.
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allow for the creation of the "platelet plug" that forms almost directly after a blood vessel has been ruptured. Within seconds of a blood vessel's epithelial wall being disrupted, platelets begin to adhere to the sub-
413:, but it has the ability to cause severe health problems if the thrombus becomes detached from the vessel wall and travels through the circulatory system; If it reaches the brain, heart or lungs it could lead to 564:
roots "heme" meaning blood, and "stasis" meaning halting; Put together means the "halting of the blood". The origin of hemostasis dates back as far as ancient Greece; first referenced to being used in the
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is great. During surgical procedures, the types of hemostasis listed below can be used to control bleeding while avoiding and reducing the risk of tissue destruction. Hemostasis can be achieved by
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There is currently a great deal of research being conducted on hemostasis. The most current research is based on genetic factors of hemostasis and how it can be altered to reduce the cause of
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Rosen, Elliot D.; Xuei, Xiaoling; Suckow, Mark; Edenberg, Howard (2006). "Searching for hemostatic modifier genes affecting the phenotype of mice with very low levels of FVII".
397:(a dozen proteins that travel along the blood plasma in an inactive state) are activated in a sequence of events known as 'coagulation cascade' which leads to the formation of 517:
The body's hemostasis system requires careful regulation in order to work properly. If the blood does not clot sufficiently, it may be due to bleeding disorders such as
405:. During this process some red and white blood cells are trapped in the mesh which causes the primary hemostasis plug to become harder: the resultant plug is called a 1108: 387:
loop. Platelets alone are responsible for stopping the bleeding of unnoticed wear and tear of our skin on a daily basis. This is referred to as primary hemostasis.
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causing excessive bleeding to be a concern in patients with this disease. There are complex treatments that can be done including a combination of therapies,
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Tahriri Mohammadreza; et al. (2011). "Preparation And Characterization Of Absorbable Hemostat Crosslinked Gelatin Sponges For Surgical Applications".
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process of hemostasis at a quicker pace. Using sutures results in a quicker recovery period because the surface area of the wound has been decreased.
110:. When endothelium of a blood vessel is damaged, the endothelial cells stop secretion of coagulation and aggregation inhibitors and instead secrete 882:
Smith Shondra L.; Belmont John M.; Casparian J. Michael (1999). "Analysis Of Pressure Achieved By Various Materials Used For Pressure Dressings".
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from inactive fibrinogen plasma protein. Thus, a fibrin mesh is produced all around the platelet plug to hold it in place; this step is called
540:, due to a deficiency or defect in an individual's platelets or clotting factors. A number of disorders can be acquired as well, such as in 1101: 1615: 1228: 409:
or blood clot. The blood clot contains the secondary hemostasis plug with blood cells trapped in it. This is a necessary step for
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The process of preventing blood loss from a vessel or organ of the body is referred to as hemostasis. The term comes from the
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Mikhail, Sameh; Kouides, Peter (December 2010). "von Willebrand Disease in the Pediatric and Adolescent Population".
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Kozak Orhan; et al. (2010). "A New Method For Hepatic Resection And Hemostasis: Absorbable Plaque And Suture".
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which forms the fibrin clots, is essential to hemostasis. Intact blood vessels moderate blood's tendency to form
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as well as mechanical or physical agents. Which hemostasis type used is determined based on the situation.
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for survival in many emergency settings. Without the ability to stimulate hemostasis the risk of
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Aldo Moraci, et al. "The Use Of Local Agents: Bone Wax, Gelatin, Collagen, Oxidized Cellulose."
589: 308:(platelets). Platelet-rich human blood plasma (left vial) is a turbid liquid. Upon addition of 753: 372: 364: 309: 111: 745: 1657: 945: 473:– This is a topical agent often used in surgery settings to stop bleeding. Microfibrillar 8: 1685: 1445: 1420: 949: 641: 1591: 989: 972: 803: 778: 422: 224: 1076: 1455: 1056: 1021: 899: 895: 808: 757: 746: 583: 525:; this requires careful investigation. Over-active clotting can also cause problems; 483: 384: 356: 716:
Boon, G. D. "An Overview of Hemostasis." Toxicologic Pathology 21.2 (1993): 170–179.
1695: 1532: 1435: 1250: 1048: 1013: 984: 953: 891: 881: 798: 790: 617: 459: 394: 312:, platelets are activated and start to aggregate, forming white flakes (right vial) 179: 129: 64: 533:, where blood clots break off and subsequently become lodged in a vein or artery. 1481: 1270: 1202: 1086: 646: 494: 449:
refers to the differences in the haemostatic system between children and adults.
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cells of intact vessels prevent blood clotting with a heparin-like molecule and
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The Surgical Review: An Integrated Basic and Clinical Science Study Guide
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Hemostasis disorders can develop for many different reasons. They may be
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Some main types of hemostasis used in emergency medicine include:
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Once the platelet plug has been formed by the platelets, the
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temporary blockage of a hole in a damaged blood vessel by a
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adhere to damaged endothelium to form a platelet plug (
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be lost. In the second step, platelet plug formation,
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Coagulation, the changing of blood from a liquid to a
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Plug formation is activated by a 13: 776: 14: 1707: 1070: 719: 40:is a process to prevent and stop 896:10.1046/j.1524-4725.1999.99151.x 556:History of artificial hemostasis 544:, which is due to pregnancy, or 178: 128: 997: 929: 910: 875: 52:(the opposite of hemostasis is 862: 770: 752:. Florida: CRC Press. p.  737: 710: 704:Human Anatomy & Physiology 661: 647:Merriam-Webster.com Dictionary 634: 1: 628: 1307:Extramedullary hematopoiesis 919:Eurasian Journal of Medicine 844:(7): 428–431. Archived from 512: 278: 267: 256: 56:). It is the first stage of 7: 623:Partial thromboplastin time 608: 577: 118:Etymology and pronunciation 10: 1712: 1053:10.1016/j.jpag.2010.08.005 1018:10.1016/j.bcmd.2005.12.037 795:10.1161/ATVBAHA.110.207522 777:Li, Zhenyu (11 Nov 2010). 293: 273: 262: 251: 18: 1640: 1600: 1574: 1546: 1513: 1473:Antigen-presenting cells 1466: 1401: 1392: 1328: 1319: 1299: 1261: 1236: 1227: 1198: 1158: 1149: 1125: 958:10.1016/j.cap.2010.08.031 546:Hemolytic-uremic syndrome 447:Developmental Haemostasis 367:(vWF), which is found in 1561:Nucleated red blood cell 1117:Myeloid blood cells and 1081:Medical Subject Headings 829:Kulkarni Roshni (2004). 429: 346:Platelet plug formation: 271:), meaning "blood", and 19:Not to be confused with 1663:Hematopoietic stem cell 1582:Leukocyte extravasation 1451:Foreign-body giant cell 938:Current Applied Physics 680:Oxford University Press 548:(HUS), which is due to 523:immune thrombocytopenia 870:European Spine Journal 838:Advances in Hematology 729:Alturi, Pavan (2005). 590:Von Willebrand disease 313: 744:Zdanowicz, M (2003). 676:UK English Dictionary 453:In emergency medicine 373:adenosine diphosphate 365:von Willebrand factor 303: 294:Further information: 112:von Willebrand factor 1658:Hematopoietic system 1446:Langhans giant cells 971:Wies, C. H. (1929). 884:Dermatologic Surgery 403:secondary hemostasis 1421:Alveolar macrophage 950:2011CAP....11..457K 872:2004; 13.: S89–S96. 482:Direct pressure or 1691:Coagulation system 1592:Intrinsic immunity 1456:Touton giant cells 423:pulmonary embolism 353:primary hemostasis 314: 290:Steps of mechanism 44:, meaning to keep 1673: 1672: 1636: 1635: 1509: 1508: 1436:Epithelioid cells 1315: 1314: 1295: 1294: 1291: 1290: 1223: 1222: 789:(12): 2341–2349. 650:. 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Index

homeostasis
biology
or
bleeding
blood
blood vessel
hemorrhage
wound healing
vasoconstriction
platelet plug
blood coagulation
fibrin
gel
clots
endothelial
thrombomodulin
nitric oxide
prostacyclin
von Willebrand factor
/ˌhmˈstsɪs/
/ˌhˈmɒstəsɪs/
combining forms
hemo-
-stasis
Neo-Latin
Ancient Greek
stasis
Coagulation

thrombocytes

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