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Intravenous (IV) infusion is often utilized when continuous and controlled drug delivery is necessary, such as during surgery or in the treatment of chronic diseases. This method offers numerous advantages, including immediate drug action, precise control over dosage, and bypassing the first-pass metabolism.
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A two-compartment model is a vital tool in pharmacokinetics, providing an essential understanding of drug behavior, especially for those administered via zero-order intravenous infusion. This model outlines two compartments: the central compartment, where elimination occurs, and the peripheral compartment.
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Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
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Infusion Misdirection in Microincisional Vitrectomy Surgery.

Edwin H Ryan1, Lawrence S Halperin2, Robert A Mittra1

  • 1VitreoRetinal Surgery, P.A., Minneapolis, Minnesota.

Ophthalmology. Retina
|May 4, 2019
PubMed
Summary
This summary is machine-generated.

Infusion misdirection during microincisional vitrectomy can cause hypotony and air infusion, though infrequent. Awareness helps, but risks remain, necessitating careful cannula positioning.

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Area of Science:

  • Ophthalmology
  • Surgical Techniques

Background:

  • Microincisional vitrectomy is a common surgical procedure.
  • Infusion misdirection is a potential complication during vitrectomy.

Purpose of the Study:

  • To review the incidence and mechanisms of infusion misdirection during microincisional vitrectomy.
  • To estimate the broader occurrence of these issues among other surgeons.

Main Methods:

  • Observational series of one surgeon's cases over two periods.
  • Survey sent to 2000 members of the American Society of Retina Specialists and the Retina Society.

Main Results:

  • In the initial series, 16% of vitrectomies showed hypotony and 3% had anterior chamber air infusion.
  • Survey results indicated that 57% of respondents reported hypotony in 1-5% of cases, and 59% reported air infusion.
  • In the later series, 12 instances of infusion blockage occurred in 118 cases, despite increased awareness.

Conclusions:

  • Infusion misdirection is an infrequent but persistent risk during microincisional vitrectomy.
  • Awareness of infusion misdirection can reduce but not eliminate its incidence.
  • Maintaining correct cannula position, potentially with external tubing support, can help avoid infusion misdirection.