According to the MRD Table, .5%
bupivacaine with 1:200,000 epinephrine has an MRD of anesthetic by
weight of 0.6 mg/lb.
Multiply 0.6 mg/lb
by 110 lb to equal 66 mg - this means that for a healthy 110 lb
adult, their MRD of .5% bupivacaine with 1:200,000 epinephrine is
66 mg.
Now multiply 5 mg/ml
(remember that this is the local anesthetic concentration for
a .5% solution) by 1.8 ml (the amount of
solution in a cartridge) to get 9 mg. of
bupivacaine per cartridge.
Next, divide 66
mg. by 9 mg. to get 7.33 cartridges.
