LA spinal dosing basics

Question 1

Procaine-

Dose

Common concentration

Redose time

Answer 1

50-200mg (0.5-2ml)

10%

30-50 minutes

Question 2

Chloroprocaine-
Dose

Redose time

Answer 2

30-100mg

30-50 minutes

Question 3

Lidocaine-

Dose

Common concentration

Redose time

Answer 3

25-100mg (1-2ml)

1.5-5% (over 4% implicated in cauda equina)

40-100 minutes

Question 4

Bupivacaine-

Dose

Common concentration

Redose time

Answer 4

5-20mg (2-4ml)

0.5-0.75%

90-140 minutes

Question 5

Tetracaine-

Dose

Common concentration

Redose time

Answer 5

5-20mg (1-6ml)

0.25-1%

90-140 minutes

Question 6

In general-

Dose

Duration

Adrenergic additives

Answer 6

Lower doses are for very restricted blocks (like saddle blocks)

Duration is generally longer at more sacral areas. Larger doses tend to last longer.

Increase duration 30-50% (lido,bupi < pro < tetra). Don’t add shit to chloro. Why? I dunno, just don’t.