2. INTRO..
⢠Anaesthesia enables the painless performance
of medical procedures that would not cause
severe or intolerable pain to an anaesthetized
patient.
⢠Three broad categories of anaesthesia exist:
1.General anesthesia
2.Sedation
3.Conduction anesthesia
3. CONTD.,
⢠General anaesthesia suppresses central nervous
system activity
⢠Sedation (or dissociative anaesthesia) a state of
calm or sleep produced by a sedative drug.
⢠Conduction anaesthesia, commonly known as
regional or local anaesthesia, blocks
transmission of nerve impulses to a targeted
organ
7. ANAESTHETICMACHINE
The anaesthetic machine is not a machine that
makes anaesthetics, but a complex collection of
equipment.
ďśContinuous-flow Machine
ďśAnaesthetic Vaporizers
ďśOxygen Mask
ďśSuction Catheter
ďśSyringe
8. Continuous-flowmachine
⢠It is used to provide a measured and continuous
supply of gases (oxygen, nitrous oxide,etc..)
⢠The above mentioned gases are mixed with a
required concentration of anaesthetic vapour to
the patient at a required pressure and rate.
9. Anaestheticvaporizers
ďśIt is used to vaporise the anaesthetic drugs
ďśTo provide a means for anesthetic vapor to be
combined with the carrier gas in a controlled
manner.
13. ANAESTHESIAMACHINE
⢠It has three major components:
1.A gas mixing and delivery system.
2. An anaesthetic breathing system ( circuit) and
a ventilator.
3.An array of monitors.
14. CONTD.,
The gas mixing and delivery system:
⢠The anaesthetic machine is connected to a
supply of purified gases.
⢠These gases usually include oxygen and nitrous
oxide, and many machines also have a supply
of compressed air.
⢠To this gas mixture, the anaesthetist can add
one of a range of additional, more powerful
anaesthetic agents, known as inhalational
agents.
15. CONTD.,
The anaesthetic breathing system (circuit) and
ventilator
⢠The anaesthetist determines the flow rate of the
final mixture of gases supplied to the breathing
system.
⢠The ventilator is an automatic breathing device,
which takes over the rhythmic inflating and
deflating of the patientâs lungs in a programmed
manner.
16. MONITORS
⢠Capnometer
⢠Oxygen Analyzer
⢠Pressure Monitor With Alarms For High And
Low Airway Pressure
⢠Pulse Oximeter
⢠Respiratory Volume Monitor (i.e., Spirometer)
17. BREATHINGSYSTEM
Calibrate the O2 Monitor
⢠Ensure the monitor reads 21% in room air.
⢠Verify that the low O2 alarm is enabled and
functioning.
18. SCAVENGINGSYSTEMS
⢠The collection and the subsequent removal of
vented gases from the operating room
⢠Components
(1) the gas-collecting assembly
(2) the transfer means
(3) the scavenging interface
(4) the gas-disposal assembly tubing
(5) an active or passive gas-disposal assembly
19. CONCLUSION
ďś They should also be checked in between cases,
ensuring that the breathing apparatus and
breathing circuit are fully patent, for the safe
anesthesia of patients.
ďśMajor manufacturers of anesthetic machines
are General Electric (GE), Larsen & Toubro
Limited, Draeger and MAQUET.