SPINAL ANAESTHESIA

a) spinal anaesthesia is the simpler, easier, cheeper technique
b) it is applied between L2-L3 (or) L3-L4 space of the sub- arachnoid space and the center of action is the caude equina rather than spinal cord.
Things required:
25-27g needle
bupivacine
fentanyl
lignocaine jelly
position
seated
procedure
1.In the seated position the injectable local anaesthetics 1%lignocaine jelly is applied at the selected point.
3. After 30sec the spinal needle is injected over the L2-L3 (or) L3-L4 region
4. check for the flow of CSF
5. withdraw the needle immediately if patient complaint of shooting pain
6. fix the needle and attach the syringe containing drug and inject over 15 sec
Factors affecting spread of drug:
1.Gravity:
The position of patient in the 1st 15mm is important as the hyperboric solution spread is markedly influenced by gravity
2.Speed of injection
3.drug volume
level of block required
volume should be reduced in pregnancy and obesity
4.age has no significant correlation