5.3 GENERAL ANAESTHESIA
The inhalation agent for inducting is in most instances delivered
through an endotracheal tube .
Short term barbiturates (pentothol) is injected intravenously.
This is referred to as induction and facilitates the introduction
of the endotracheal tube with the help of direct lyrangoscope
.
The tube is then connected with an anaesthesia machine .
5.3.1 TECHNIQUE
The dose of anaesthetic to be given to any patient by inhalation
cannot be calculated based on milligrams of anaesthetic per
kilogram body weight.
* In addition, there is a problem of maintaining sufficient
ventilation.
* Both these objectives are obtained by frequent clinical
examination of the patient so as to ensure sufficient level
of anaesthesia and adequate ventilation.
* The mixture of the anaesthetic agent and oxygen is adjusted
to provide sufficient anaesthesia without causing excess
depression of the central nervous system by observing the
effect on reflexes.
* The ideal state to be maintained is a plane of anaesthesia
in the 3rd state.
The ideal plane will depend upon the surgical procedure to
be performed.
* In all events, 4th stage, a stage of overdosage is to be
avoided.
These reflexes are listed and the stages indicated in the
are based on the effects described by Guedel
(1937).
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