Introducing Anaesthesia PDF

Introducing Anaesthesia PDF 2015

Introducing Anaesthesia PDF

  1. Introducing Anaesthesia Book
  2. Introducing Anaesthesia Book
  3. Introducing Anaesthesia Ebook


1.1 Introduction
The safe practice of anaesthesia requires familiarity with a wide range of equipment.
The anaesthetist should be ready to use any of the following equipment and must have
detailed knowledge of its operation.
2 The anaesthetic machine

The anaesthetic machine is one of the most important pieces of equipment and is
fundamental to delivering safe anaesthesia. It can seem like a complex and intimidating
device to use, but fundamentally it is designed to fulfil only one purpose: to take a
variety of medical gases and mix them in a manner specified by the anaesthetist, before
delivering them in a controlled way to the patient.
2.1 Piped medical gases
Most anaesthetic machines will take their primary gas supply from the hospital pipeline
supply. Some theatres, particularly those separate from the hospital’s main theatre
block, may only have cylinder supplies.
Pipeline supplies have the advantage that they draw their gases from a central location
in the hospital and should therefore never run out!

There are three gases commonly supplied to theatres via pipeline: oxygen, medical
air, and nitrous oxide. Medical vacuum is also commonly taken from a pipeline supply.
Although not a gas per se, the principles of its delivery and connection to the anaesthetic
machine are similar.
Each gas is supplied to an outlet found either in the wall of theatre or from a pendant
hanging from the roof. These outlets are called Schrader valves. The valves are
colour-coded, and each outlet is of a slightly different size and shape, so it should not
be possible to misconnect hoses in theatre.
Hoses take the gases from the outlet to the anaesthetic machine. Each hose is also
colour-coded, and they connect to the back of the anaesthetic machine via a screw
connection. These connections are unique to each gas (termed a non-interchangeable
screw thread, NIST) and are designed to minimize the risk of misconnection at the
machine end…

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