Anesthetic Class Notes

General Anaesthics

, ANESTHETICS
These are agents used to block
the transmission of pain.

Anesthesia is a condition where
no movement occurs in response
to what should be painful.

,• Stages of General anesthesia
• Analgesia (Stage 1): This stage lasts from onset
of drowsiness to loss of eyelash reflex (ie
blinking when the eyelash is stroked). In this
stage, variable levels of amnesia and analgesia
are seen. The patient is taken as unconscious at
the end of this stage 1.
• Excitement (Stage 11): This stage is
characterized by agitation and delirium. Here,
heart rate and respiration may be irregular. The
patient should be moved through this
undesirable stage quickly. Induction agents are
designed to achieve this

, Surgical Anesthesia (stage III):
This is the target depth for surgical
procedures. Here a particular stimulus will
not elicit a somatic reflex(involuntary
movement or response to a stimulus) or
deleterious autonomic response.
Impending Death (Stage iv): This stage
extends from onset of apnea( a serious
condition where breathing starts and stops
intermittently) to failure of circulation and
respiration and ends in death.