General anesthesia: definition, main features and the stage . Preanesthetic medications.

Question 1

General anesthesia: definition

Answer 1

reversible state of cns depression with 
-unconsciousness
-loss of pain sensation
-memory loss
-inhibition of autonomous reflexs
and skeletal muscle relaxation.

Question 2

General anesthesia: use

Answer 2

for surgical procedure to render the patient unaware / unresponsive to the painful stimuli.

Question 3

Stages of anesthesia:

Answer 3

Stage I : Analgesia Stage II : Excitement, combative behavior – dangerous state
Stage III : Surgical anesthesia
Stage IV : Awakening Medullary paralysis – respiratory and vasomotor control ceases.

Question 4

Preanesthetic medication:

Answer 4

To relieve anxiety – benzodiazepines ( diazepam and midazolam)
 To prevent allergic reactions – antihistaminics.  To prevent nausea and vomiting – scopolamine, metclopramide)
 To provide analgesia – opioids.
 To prevent bradycardia and secretion – atropine.