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Related Concept Videos

Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower indicates...
Laminar Flow01:27

Laminar Flow

Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Poiseuille's Law and Reynolds Number01:10

Poiseuille's Law and Reynolds Number

Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
Stages of General Anesthesia01:22

Stages of General Anesthesia

Various sedation levels offer significant advantages in facilitating procedural interventions for patients undergoing medical or invasive surgical procedures. These levels span from anxiolysis to general anesthesia, providing a spectrum of sedative effects to cater to specific patient needs. Anxiolysis reduces anxiety and is achieved through minimal sedation, enabling patients to remain awake and responsive while feeling more at ease during the procedure. This level can benefit minor...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

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Related Experiment Video

Updated: Jun 22, 2026

Use of a Low-flow Digital Anesthesia System for Mice and Rats
08:06

Use of a Low-flow Digital Anesthesia System for Mice and Rats

Published on: September 7, 2016

Low-flow anaesthesia at a fixed flow rate.

A Cherian1, A Badhe

  • 1Department of Anesthesiology and Critical Care, Jawaharlal Institute of Post graduate Medical Education and Research, Pondicherry, India. anushacherian@gmail.com

Acta Anaesthesiologica Scandinavica
|July 4, 2009
PubMed
Summary
This summary is machine-generated.

Low-flow anesthesia (LFA) using fixed gas rates of 300 ml/min oxygen and 300 ml/min nitrous oxide is safe for 2 hours in adult patients. This method avoids the need for inspired oxygen (FiO2) monitoring.

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Published on: January 13, 2017

Area of Science:

  • Anesthesiology
  • Respiratory Physiology

Background:

  • Low-flow anesthesia (LFA) offers potential economic and environmental benefits.
  • Concerns exist regarding the stability of inspired oxygen (FiO2) levels and the necessity of monitoring during LFA.

Purpose of the Study:

  • To evaluate the safety of LFA at fixed fresh gas flows (300 ml/min O2 and 300 ml/min N2O).
  • To assess the incidence of FiO2 falling below 0.3.
  • To determine if LFA is safe without an FiO2 monitor.

Main Methods:

  • 100 adult patients received general anesthesia with LFA (300 ml/min O2, 300 ml/min N2O) for 2 hours.
  • Isoflurane was set at 1.5% dial setting.
  • Gas composition was analyzed, with FiO2 <0.3 considered unsafe without monitors.

Main Results:

  • The lowest recorded FiO2 was 31%.
  • No adverse events occurred that required switching to conventional flow rates.

Conclusions:

  • LFA at 300 ml/min N2O and 300 ml/min O2 is safe for 2-hour procedures in adult patients (40-75 kg).
  • Monitoring of oxygen and anesthetic agent is not required for this LFA protocol.