Transcript 05 – calculations

Calculations, Drips
and Titrations
1 ml
4mg/1ml
5 ml
20mg/5ml
Remember:
It is better
to weigh
yourself in
kilograms
than in
pounds.
It does not take a nerd to know that
kilograms are less (numerically) than
pounds.
Kilogram (kg)
generally used for patient
weight
milligram (mg)
generally used for patient
weight and drug dosages
microgram (mcg) generally used for drug
dosages
liter (L)
generally used for IV solutions
milliliters (ml)
generally used for fluid or drug
dosages
1,000 grams
= 1 kilogram
1/1000 gram
= 1 milligram
1/1,000,000 gram
= 1 microgram
1,000 liters
= 1 kiloliter
1/100 meter
= 1 centimeter
Drugs
Drips
Am I ever
gonna get
through
this??
This way to Ron’s
“give over have”
method.
Your medical control physician orders 3 mg of
morphine sulfate for a chest pain patient. The
morphine is in a Tubex prefilled cartridge, 10 mg in 1
ml dilution. How many milliliters would you give?
a)
b)
c)
d)
3mg
10mg/ml
3 ml.
0.3 ml.
0.03 ml
30 ml.
3mg
10 mg/ml
3
10ml
=
0.3 ml
You have been ordered to administer a repeat IV bolus
dose of lidocaine at 0.75 mg/kg. The patient weighs 150
lbs. The lidocaine is packed in a 5 ml prefilled syringe
that contains 100 mg of lidocaine. How many ml of the
prefilled lidocaine syringe do you administer?
a)
b)
c)
d)
75mg/kg 75mgX68k
100mg/5ml 20mg/1ml
5.0 ml.
3.5 ml.
2.5 ml.
1.5 ml.
51mg
20mg/ml
51mg
20mg/ml
51
= 2.5 ml
20ml
Medical control orders 5mg/kg of bretylium by IV bolus. Your
patient weighs 150 lbs. The bretylium ampule reads “bretylium
500 mg in 10 ml.” How many ml of Bretylol do you administer?
a)
b)
c)
d)
5mg/kg
500mg/10ml
34mg
5mg/ml
6.8 ml.
5.5 ml.
3.0 ml.
2.6 ml.
5mg X 68
500mg/10ml
34mg
5mg/ml
34
5ml
340mg
50mg/ml
=
340mg
50mg/ml
6.8 ml
To administer a lidocaine drip or infusion, you have mixed 2 grams
of lidocaine in 500 ml of D5W. Medical control orders a 2 mg/min
infusion rate. Using a microdrip administration set (60 drops/ml),
your drip rate will be:
a)
b)
c)
d)
2mg/min x 60gtts/ml
2gm/500ml
2mg/min x 60gtts/ml
4mg/ml
15 drops/min.
30 drops/min.
45 drops/min.
60 drops/min.
2mg/min x 60gtts/ml
2000mg/500ml
120gtts/min
4
=
2mg/min x 60gtts/ml
2000mg/500ml
30gtts/min
That wasn’t
so bad was
it?