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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
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An Injectable and Drug-loaded Supramolecular Hydrogel for Local Catheter Injection into the Pig Heart
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Intravenous catheters induce a local inflammatory response.

Katherine Chabot1, Marie-Eve Lavoie2, Jean-Philippe Bastard3

  • 1Institut de recherches cliniques de Montréal (affiliated to the Université de Montréal), 110 Avenue des Pins Ouest, Montréal, QC H2W 1R7, Canada.

Cytokine
|June 16, 2018
PubMed
Summary

An intravenous catheter can elevate interleukin-6 (IL-6) levels, mimicking inflammation during physiological testing. A high-fat meal did not further increase IL-6, IL-8, or hsCRP levels, regardless of collection method.

Keywords:
CRPIL-6InflammationIntravenous catheter

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Area of Science:

  • Physiology
  • Immunology
  • Cardiovascular Medicine

Background:

  • Chronic inflammation is linked to cardiometabolic disorders.
  • Intravenous (IV) catheters are standard for physiological testing but can induce local inflammation.
  • This local response may not accurately represent systemic inflammatory status.

Purpose of the Study:

  • To evaluate the impact of an IV catheter on serum concentrations of IL-6, IL-8, and hsCRP.
  • To compare inflammatory markers after fasting versus a high-fat meal (HFM).
  • To determine if blood collection method (catheter vs. venipuncture) influences results.

Main Methods:

  • Twenty-two healthy participants underwent two test sessions (water only or HFM).
  • An IV catheter was inserted, with blood samples drawn at baseline and multiple time points.
  • Control blood samples were obtained via venipuncture at later time points for comparison.

Main Results:

  • Serum IL-6 increased over time when collected via catheter (P<0.001) but not venipuncture (P=0.15-0.23).
  • The HFM did not significantly affect IL-6 levels regardless of collection method (P=0.27).
  • Serum IL-8 and hsCRP levels remained stable and were unaffected by meal type or collection method.

Conclusions:

  • Indwelling IV catheters can induce a local inflammatory response, potentially mediated by IL-6.
  • This catheter-induced inflammation is not exacerbated by a high-fat meal.
  • Venipuncture is a more reliable method for assessing systemic IL-6 levels in this context.