Sterile Inflammation
Sterile Inflammation - Related Videos
01:38
Inflammation
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2019
Overview In response to tissue injury and infection, mast cells initiate inflammation. Mast cells release chemicals that increase the permeability of adjacent blood capillaries and attract additional immune cells to the wound or site of infection. Neutrophils are phagocytic leukocytes that exit the bloodstream and engulf invading microbes. Blood clotting platelets seal the wound and fibers create a scaffold for wound healing. Macrophages engulf aging neutrophils to end the acute inflammatory...
12:29
Sterile Tissue Harvest
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN In 1959 The 3 R's were introduced by W.M.S. Russell and R.L. Burch in their book The Principles of Humane Experimental Technique. The 3 R's are replacement, reduction, and refinement of the use of animals in research. The use of cell lines and tissue cultures that originated from research animals is a replacement technique, as it allows for many experiments to be conducted in vitro. Harvesting...
01:30
Cleaning, Sterilization, and Disinfection
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2023
Cleaning, disinfection, and sterilization are the methods that help to break the infection chain and prevent disease. Cleaning The cleaning process usually involves using water with detergents or enzymatic cleaner and removing foreign material from objects and surfaces, including organic material such as body fluids or inorganic material like soil. Cleaning is performed before high-level disinfection and sterilization because foreign materials on the cover of the devices interfere with process...
01:30
Methods of Sterilization II: Chemical Methods
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2023
In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements. Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...
01:29
Methods of Sterilization I: Physical Methods
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2025
As used in a healthcare facility, sterilization destroys all microorganisms through physical or chemical methods. The physical method includes steam, dry heat, boiling water, and radiation. Steam sterilization uses non-toxic, low-cost moist heat in the form of saturated steam under pressure, which is fast, microbicidal, and sporicidal, and quickly warms and penetrates fabrics. Autoclaves, or steam sterilizers, expose each item to direct steam contact for a predetermined time at the necessary...
FAQs
The sequence begins when injured or stressed cells release danger-associated molecular patterns, or DAMPs. These signals are detected by pattern-recognition receptors, which activate inflammasomes and other inflammatory signaling pathways. The resulting cytokine production communicates tissue danger and promotes immune-cell recruitment, linking cellular damage to a coordinated innate immune response even when microorganisms are absent.
A short-lived response can support recognition of tissue damage, but persistent activation maintains cytokine production and immune-cell recruitment. This ongoing activity can amplify the original injury rather than resolve it. Regulation therefore matters in medicine because loss of control may convert an initially protective reaction into continuing tissue damage and contribute to disease progression.
The key distinction is the initiating signal. Sterile inflammation is triggered by tissue injury, cellular stress, or metabolic disturbance, whereas infection-associated inflammation follows recognition of invading microorganisms. Both can activate innate immune signaling and recruit immune cells, so the inflammatory response may look similar in broad terms even though the source of danger differs.
Sterile inflammation is relevant to acute tissue damage after trauma, surgery, and ischemia-reperfusion injury, where injury-related signals can activate innate immunity. It also contributes to chronic conditions such as atherosclerosis and autoimmune disease. These settings illustrate how the same general response can appear briefly after an acute insult or persist during long-term disease.
These clinical situations involve tissue stress or injury that can release danger-associated molecular patterns without requiring invading microorganisms. The released signals activate inflammatory pathways, increase cytokine production, and recruit immune cells to the affected area. Understanding this response helps explain how tissue damage may be followed by additional inflammatory amplification after ischemia-reperfusion or operative injury.
Studying the process shows how repeated or unresolved danger signaling can connect cellular stress with persistent immune activation. Cytokines and recruited immune cells may continue influencing damaged tissue, creating a cycle that amplifies injury. This framework is especially relevant to atherosclerosis and autoimmune disease, where inflammatory activity contributes to ongoing pathology rather than remaining a brief response.