# Ch. 7 Anesthesia

## 25 terms

500 mg

90 mg

300 mg

300 mg

400 mg

### how would you figure out the mg/lb of a drug if you only know the mg per appt?

MRD per appt/150=mg/lb
(example: 500mb/150=3.2)

1.8 ml solution

### how many mg of LA per cartridge in a 1% solution?

18 mg
(if it is 2%-2 X 18=36 mg or 4%- 4 X18=72 mg)

### how do you convert pounds to kilograms? and kg to lbs?

lbs to kg = lbs/2.2
kg to lbs = kg X 2.2

### 2 cartridges of 2? lidocaine plain have been given to a 100 lbs pt. How many mg have been give?

72 mg (2 (cartridges) X 36=72mg)

### what is the MRD for a 100lbs pt receiving 2% lidocaine plain?

200 mg (2mg/lb(MRD=300/150=2mg/lb) X 100lbs=200mg)

### How many additional mg can this pt receive? (received 72 mg of 2% lido and her MRD=200 mg)

128 mg (200 mg - 72 mg =128 mg)

### how many cartridges is 128mg? when giving 2% lido

3.5 cartridges (128mg/36mg(mg per cart)=3.5 carts)

### t/f when giving additional doses of a different drug you use the MRD of the last drug given to calculate the additional cartridges the pt can receive

FALSE! (use MRD of the most toxic drug..EXAMPLE switching from lido to bupivicaine use MRD for bupivicaine)

### How many carts of 4% articaine can be given to the pt that has already recieved 2 carts of 2% lido?

1.7 cartridges (MRD of articaine for this pt is 320 so limiting factor is lido MRD which is 200mg. 200 mg -72 mg=128 mg left to be given. 128/72=1.7 cartridges)

0.2mg

1 mg

.04 mg

.2 mg

.018 mg/cart

### how much epi is in 1 cartridge of 1:50k?

.036 (2x's 1:100k)

### how much epi is in 1 cart of 1:200k?

.009 (half 1:100k)

### how much epi is in 1 cart of 1:20K

.09 (3x's 1:100k)

### What is the limiting factor for a 150 lbs female receiving 2% lidocaine with 1:50k epi?

epi is limiting factor (with all concentrations the limiting factor is the LA except with 1:50 then it is the epi)

### t/f for an obese child you would use the clarks rule

false! (youngs, a obese child weighing the amount of a 20 year old doesn't have the organ development to metabolize the drug properly)