Stages and Planes of Anesthesia Overview

Preanesthesia

Period before anesthesia administration begins.

Induction

Transition from consciousness to anesthesia onset.

Maintenance

Sustaining anesthesia during surgical procedures.

Recovery

Return to consciousness after anesthesia ends.

Stage I

From induction to loss of consciousness.

Disorientation

Mild confusion experienced during Stage I.

Inhalent anesthesia

Prolonged effect using inhaled anesthetic agents.

Injectable anesthesia

Accelerated effect using injected anesthetic agents.

Stage II

Loss of consciousness to automatic breathing onset.

Excitement phase

Characterized by increased movement and delirium.

Stage II duration

Should be passed quickly to avoid complications.

Rough recovery

Patients may experience agitation during recovery phase.

Sedatives

Drugs used to calm patients during recovery.

Analgesics

Pain relief medications administered post-anesthesia.

Stage III

Surgical anesthesia divided into four planes.

Plane 1

Very light anesthesia with minimal reflexes.

Plane 2

Adequate anesthesia; eye movement ceases.

Plane 3

Slightly deep anesthesia; pupils dilated.

Plane 4

Excessively deep anesthesia; risk of apnea.

Stage IV

Total apnea leading to potential death.

Apnea

Absence of breathing, critical condition in Stage IV.