SPINAL ANAESTHESIA: It is highly reliable, easier to place (beacuse it can be confirmed by the presence of CSF in the needle and loss of resistance) and has very quick onset. However, it can be performed only for the surgeries of limited duration. Redosing cannot be done if the procedure takes longer time than expected. PDPH is a very common problem.

EPIDURAL ANAESTHESIS: It is difficult to perform (requires expext persons) and therefore is less reliable. Further, onset of analgesic effect is slower. But it can be used for surgeries of any duration by inserting an epidural catheter. Chances of PDPH is very less because it is quite superficial procedure (no CSF leak)  (**** PDPH: POST DURAL PUNCTURE HEADACHE)

CONCENTRATION (IN %) OF LA FOR DIFFERENT USES
	LIGNOCAINE	BUPIVACAINE
Infiltration	0.5-2	0.25-0.5
Spinal	5	0.5
Epidural	2	0.5

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Q. Post dural (spinal) puncture headache is due to
A) Seepage of CSF
B) Fine needle
C) Toxic effects of the drugs
D) Traumatic damage to nerve roots
Ans: A

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