Hemorrhagic Event
Hemorrhagic Event - Related Videos
02:29
Modeling Drug-Induced Hemorrhage in Zebrafish Larva
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2025
In this video, fertilized zebrafish embryos are dechorionated under a stereo microscope and then exposed to a cholesterol synthesis inhibitor, leading to the development of blood vessel ruptures and brain hemorrhages in the larvae. Hemorrhagic larvae, identifiable by distinct red spots, are subsequently separated under a microscope for further analysis.
07:57
Integrated Compensatory Responses in a Human Model of Hemorrhage
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Cited by 11 •
2016
The purpose of this protocol is to demonstrate the techniques for measuring compensatory responses to reduced central blood volume using lower body negative pressure as a noninvasive experimental model of human hemorrhage which can be used to quantify the total integration of compensatory mechanisms to blood volume deficit in humans.
16:31
Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
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Cited by 24 •
2011
The Hemorrhagic Shock model has been a reliable and reproducible resource facilitating the identification and understanding of signaling cascades associated with inflammation and end-organ damage after trauma. This article provides a step-by-step description of surgical and mechanical aspects associated with the Hemorrhagic Shock experimental procedure in mice.
10:44
Modeling Intracerebral Hemorrhage in Mice: Injection of Autologous Blood or Bacterial Collagenase
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Cited by 60 •
2012
Clinically relevant animal models of intracerebral hemorrhage (ICH) are needed to extend our knowledge of hemorrhagic stroke and to examine novel therapeutic strategies. In this study, we describe and evaluate two ICH models that implement unilateral injections of either autologous whole blood or bacterial collagenase into the basal ganglia (corpus striatum) of mice.
04:43
Induction of a Subarachnoid Hemorrhage in a Mouse Model through Endovascular Perforation
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2025
The video demonstrates the induction of subarachnoid hemorrhage via endovascular perforation in a mouse model. An incision is made in the neck region of the anesthetized mouse to access the common carotid artery and its bifurcation. A filament is inserted through the arteries to perforate an intracranial artery branch, inducing subarachnoid hemorrhage.
FAQs
Hemostasis acts through coordinated stages rather than a single response. Vascular constriction first helps reduce blood flow at the damaged site. Platelets then adhere to the disrupted vessel and aggregate, while coagulation proteins become activated. Together, these processes produce a clot that limits continued blood loss and supports subsequent vessel repair.
The effects depend partly on where escaped blood accumulates. Blood entering surrounding tissue can increase local pressure, whereas bleeding into a body cavity or outside the body creates different consequences. In any location, extensive loss may reduce oxygen delivery, and severe impairment of circulation can progress to shock.
Uncontrolled bleeding develops when the vessel response, platelet activity, and coagulation processes do not sufficiently limit blood loss. Continued escape of blood can enlarge the affected region, increase pressure within tissue, and compromise oxygen delivery. If the loss becomes severe, the resulting circulatory disturbance may produce shock.
They provide a biological context for examining how vessel disruption, vascular constriction, platelets, and coagulation proteins interact after injury. Studying these linked responses helps clarify how vessels limit blood loss and support repair. The same framework connects cellular and molecular mechanisms with the tissue-level consequences of bleeding.
Assessment should account for the extent of blood loss, the destination of the escaped blood, and the body’s ability to maintain hemostasis. Researchers also consider whether tissue pressure rises, oxygen delivery is impaired, or shock develops. These outcomes help distinguish a contained event from one with broader physiological consequences.
Hemorrhagic events are important because their mechanisms and consequences inform efforts to recognize bleeding, control blood loss, and repair disrupted vessels. Research can connect observable outcomes, such as impaired oxygen delivery or shock, with the underlying hemostatic response. This knowledge supports development of targeted therapies for bleeding-related conditions.