Intravenous Challenge
Intravenous Challenge - Related Videos
07:48
Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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Cited by 45 •
2016
Intravenous administration of endotoxin reliably elicits dose-dependent physiological and immunological alterations consistent with several pathological states. This reductionist approach permits the investigation, modeling and experimental modification of systemic inflammation and its downstream effects in man.
07:22
Discontinuing Intravenous Fluids and a Peripheral Intravenous Line
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2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT Intravenous (IV) fluid administration and peripheral IV catheters (PIVs) may be discontinued for a number of reasons. The most common reason for discontinuing IV fluids is that the patient has returned to normal body fluid volume (euvolemia) and is able to maintain adequate oral fluid intake or is being discharged from the hospital. In addition, the Centers for Disease Control Guidelines...
11:27
The Use of Pharmacological-challenge fMRI in Pre-clinical Research: Application to the 5-HT System
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Cited by 9 •
2012
The goal of this technique is to assess serotonin (5-HT) neurotransmitter function in the live and free-breathing animal with pharmacological magnetic resonance imaging (phMRI) and an intravenous challenge with a selective serotonin reuptake inhibitor (SSRI), fluoxetine.
11:39
Peripheral Intravenous Catheter Insertion
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2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT The purpose of peripheral intravenous catheter (PIV) insertion is to infuse medications, perform intravenous (IV) fluid therapy, or inject radioactive tracers for special examination procedures. Placing a PIV is an invasive procedure and requires the use of an aseptic, no-touch technique. Common IV venipuncture sites are the arms and hands in adults and the feet in children. According to...
07:08
Assessing and Flushing a Peripheral Intravenous Line
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2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT After peripheral intravenous (IV) access is initiated, it is important to assess and maintain the IV catheter according to institutional policies and nursing standards of practice. The regular assessment of the insertion site and the surrounding areas for signs of complications is necessary to prevent IV catheter complications, including infiltration, phlebitis, infection, extravasation, or...
FAQs
Direct entry into circulation reduces the influence of initial tissue barriers and allows the introduced material to distribute rapidly through the body. This makes the model especially useful for examining systemic dissemination, early interactions with blood components and immune cells, and responses in target organs. The resulting findings focus more directly on circulation-wide host-pathogen or host-substance interactions.
The type of introduced material shapes the biological question and the measurements that matter. A pathogen can support analysis of dissemination, pathogen burden, clearance, and disease severity, whereas an antigen or other test substance can emphasize systemic immune responses. Using a defined dose helps researchers relate observed inflammation, tissue effects, or protection to a controlled experimental input.
Once material enters circulation, immune cells and blood components can encounter it before it reaches target organs. These interactions may influence cytokine production, inflammatory responses, distribution, and eventual clearance. Examining both circulating responses and organ-level pathology helps connect early systemic immune activity with later evidence of infection, tissue injury, or host protection.
Protection and disease severity require related but different interpretations. Lower pathogen burden and more effective clearance can indicate protective immunity, while cytokine production, tissue pathology, and survival provide evidence about inflammatory impact and overall outcome. Considering these measures together prevents a single readout from being treated as a complete description of immune function or disease progression.
A typical evaluation begins with introducing a defined dose of the selected pathogen, antigen, or test substance, followed by assessment of systemic responses. Researchers can then examine pathogen burden, cytokine production, tissue pathology, and survival. Comparing these outcomes across experimental groups allows the challenge to test differences in immune responses, clearance, protection, or disease severity.
This approach is useful when investigators need to determine whether vaccination or treatment changes systemic infection or host responses. Outcomes such as reduced pathogen burden, improved clearance, altered cytokine production, less tissue pathology, or improved survival can provide complementary evidence of efficacy. The model also helps investigate mechanisms of host-pathogen interaction relevant to intervention performance.