Stages of general anesthesia
Stage 3 Surgical Anesthesia 4 planes
Plane 1: extremities calm, regular breathing, pharyngeal reflex ceases, eyelid reflex lost Plane 2: eyes centrally fixed, pupils decrease in size, loss of muscle tone Plane 3: pupil reflex lost, intercostals ms paralysis Plane 4: respiration gradually depressed and increased diaphragm paralysis. [i.e. DO NOT want to go past here. Stay in stage 3 because its safe. AKA "sleepless dentistry]
Stages of General Anesthesia
Stage 1: Analgesia Stage 2: Excitement or delirium Stage 3: Surgical Anesthesia Stage 4: Medullary/Respiratory paralysis
Stage 2 Delirium / Excitement
a. delirium stage from loss of consciousness to onset of surgical anesthesia b. irregular breathing, retching, incoherent, speech, movement of limbs c. because of retching, the stomach should be empty before receiving general anesthesia
Stage 3 Surgical Anesthesia [where most major surgery is performed]
a. from the onset of regular breathing to respiratory failure b. patient's protective gag & cough reflexes suppressed; must provide patient with throat packs to prevent aspiration of foreign objects and maintain a patent airway c. includes 4 planes
Stage 4 respiratory paralysis
a. medullary paralysis, respiratory arrest, vasomotor collapse, reduced circulatory flow, BP and pulse feeble, respiration will cease [NOT GOOD. NOT GOOD. RISK FOR DEATH]
Stage 1 (Analgesia and Sedation, Relaxation)
a. precedes the loss of consciousness & is completed when pt loses consciousness b. divided into 3 planes - the first two planes being the state of relative analgesia [i.e. nitrous oxide-oxygen places patient in this stage]
