drug math lesson 4
TRANSCRIPT
Lesson Three
– In this lesson we will cover other methods of medication calculation.
– I will review some tips and tricks for easier, and faster calculation.
– We will apply all methods, and calculations learned thus far and practice some common drug doses.
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
Example: you are ordered to administer 1200ml over 3 hours using a 60gtts/ml solution set.
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
DD: 1200ml
SS: 60gtts/ml
T: 180 min
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
DD: 1200ml 1200ml x 60gtts/ml
SS: 60gtts/ml 180min
T: 180 min
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
DD: 1200ml 1200 x 1 gtts/min
SS: 60gtts/ml 3
T: 180 min
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
DD: 1200ml 400 gtts/min
SS: 60gtts/ml
T: 180 min
Calculating Fluids
• When using a minidrip, the final gtts/min will be equal to the DD per hour.
- You wanted to give 1200ml over 3 hours.- That is equal to 400ml per hour- The answer was 400gtts/min- THIS ONLY WORKS WITH A MINIDRIP
The Clock Method
The Clock Method
• Lidocaine Clock– 2gm/500ml or 1gm/250ml
The Dopamine Trick
• Take the patient’s weight in pounds.
• Drop the last digit.
• Subtract two
• The resulting number is your gtts/min for a starting dose of 5mcg/kg/min
The Dopamine Trick
• Take the patient’s weight in pounds.• Drop the last digit.• Subtract two• The resulting number is your gtts/min for a
starting dose of 5mcg/kg/min– 176 lb ----drop the last number– 17 ----subtract 2 from this number– 15gtts/min = 5mcg/kg/min
• This only works with a minidrip and 1600mcg/ml concentration
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5mcg/kg/min x 80kg x 60gtts/ml400mg/250ml
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5mcg/kg/min x 80kg x 60gtts/ml400,000mcg/250ml
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5mcg/kg/min x 80kg x 60gtts/ml1600mcg/ml
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5 x 8 x 6 gtts/min 16
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5 x 1 x 6 gtts/min 2
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5 x 1 x 3 gtts/min 1
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
5 x 3 gtts/min 1
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
15 gtts/min 1
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
15 gtts/min
The Dopamine Trick
• 15gtts/min• Lets check it• 176 lb = 80kg
15 gtts/min
IT WORKS!
Practice
• You have a patient who is in SVT.
• You are ordered to administer 6mg of Adenosine, rapid IV push.
• You have a 4cc pre-filled syringe with 12 mg of Adenosine.
• Your patient is 154 lbs
• You have a patent IV.
Practice
• DD - 6mg
• C - 12mg / 4ml
Practice
• DD - 6mg
• C - 12mg / 4ml
6mg
12mg/4ml
Practice
• DD - 6mg
• C - 12mg / 4ml
6mg
3mg/ml
Practice
• DD - 6mg
• C - 12mg / 4ml
6
3 ml
Practice
• DD - 6mg
• C - 12mg / 4ml
2ml
Practice
• You administer the Adenosine, and the SVT only breaks momentarily.
• You are ordered to administer 0.25 mg/kg of Cardizem slow IV push.
• You have a 5ml vial containing 25mg of Cardizem.
• Your patient weighs 154 lbs.
Practice
• DD - 0.25mg/kg
• Wt - 154 lbs
• C - 25mg / 5ml
Practice
• DD - 0.25mg/kg
• Wt - 154 lbs
• C - 25mg / 5ml
154 ÷ 2= 77
Practice
• DD - 0.25mg/kg
• Wt - 154 lbs
• C - 25mg / 5ml
154 ÷ 2= 77 - 7 = 70
Practice
• DD - 0.25mg/kg
• Wt - 70kg
• C - 25mg / 5ml
0.25mg/kg x 70kg
25mg/5ml
Practice
• DD - 0.25mg/kg
• Wt - 70kg
• C - 25mg / 5ml
0.25mg/kg x 70kg
5mg/ml
Practice
• DD - 0.25mg/kg
• Wt - 70kg
• C - 25mg / 5ml
0.25 x 70
5 ml
Practice
• DD - 0.25mg/kg
• Wt - 70kg
• C - 25mg / 5ml
17.5
5 ml
Practice
• DD - 0.25mg/kg
• Wt - 70kg
• C - 25mg / 5ml
3.5ml
Practice
• You are ordered to administer 0.1mg/kg of Ativan to a patient for seizures.
• You have a 1cc vial with 2mg of Ativan in it.
• Your patient weighs 121 lbs.
Practice
• DD - 0.1mg/kg
• Wt - 121 lbs
• C - 2mg / ml
Practice
• DD - 0.1mg/kg
• Wt - 121 lbs
• C - 2mg / ml
121 ÷ 2
Practice
• DD - 0.1mg/kg
• Wt - 121 lbs
• C - 2mg / ml
121 ÷ 2 = 60.5
Practice
• DD - 0.1mg/kg
• Wt - 121 lbs
• C - 2mg / ml
121 ÷ 2 = 61 - 6
Practice
• DD - 0.1mg/kg
• Wt - 121 lbs
• C - 2mg / ml
121 ÷ 2 = 61 - 6 = 55
Practice
• DD - 0.1mg/kg
• Wt - 55kg
• C - 2mg / ml
0.1mg/kg x 55kg
2mg/ml
Practice
• DD - 0.1mg/kg
• Wt - 55kg
• C - 2mg / ml
0.1 x 55
2 ml
Practice
• DD - 0.1mg/kg
• Wt - 55kg
• C - 2mg / ml
5.5
2 ml
Practice
• DD - 0.1mg/kg
• Wt - 55kg
• C - 2mg / ml
2.75ml
Practice
• You are preparing to perform rapid sequence induction, to intubate your patient.
• Your orders are to begin with 0.3mg/kg of Etomidate/Amidate.
• Your Patient weighs 187 lbs.• You have a 20ml pre-filled syringe,
containing 40mg of Etomidate.
Practice
• DD - 0.3mg/kg
• Wt - 187 lbs
• C - 40mg/20ml
Practice
• DD - 0.3mg/kg
• Wt - 187 lbs
• C - 40mg/20ml
187 ÷ 2
Practice
• DD - 0.3mg/kg
• Wt - 187 lbs
• C - 40mg/20ml
187 ÷ 2 = 93.5
Practice
• DD - 0.3mg/kg
• Wt - 187 lbs
• C - 40mg/20ml
187 ÷ 2 = 94 - 9
Practice
• DD - 0.3mg/kg
• Wt - 187 lbs
• C - 40mg/20ml
187 ÷ 2 = 94 - 9 = 85
Practice
• DD - 0.3mg/kg
• Wt - 85kg
• C - 40mg/20ml
Practice
• DD - 0.3mg/kg
• Wt - 85kg
• C - 40mg/20ml
0.3mg/kg x 85kg
40mg/20ml
Practice
• DD - 0.3mg/kg
• Wt - 85kg
• C - 40mg/20ml
0.3mg/kg x 85kg
2mg/ml
Practice
• DD - 0.3mg/kg
• Wt - 85kg
• C - 40mg/20ml
25.5
2 ml
Practice
• DD - 0.3mg/kg
• Wt - 85kg
• C - 40mg/20ml
12.75ml
Practice
• Your RSI protocol also requires that you administer 2mg/kg of succinylcholine immediately after the Etomidate.
• You have a 10cc vial with 200mg of Succs.
• The patient weighs 85kg
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
2mg/kg x 85kg
200mg/10ml
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
2mg/kg x 85kg
20mg/ml
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
2 x 85
20 ml
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
170
20 ml
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
17
2 ml
Practice
• DD - 2mg/kg
• Wt - 85kg
• C - 200mg/10ml
8.5ml
Practice
• After you intubate your patient, you are ordered to administer 10mcg/kg/min of Propofol/Diprivan to keep the patient from becoming responsive.
• You have a 50ml vial, containing 500mg of Diprivan.
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
10mcg/kg/min x 85kg x 60gtts/ml
500mg/50ml
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
10mcg/kg/min x 85kg x 60gtts/ml
500,000mcg/50ml
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
10mcg/kg/min x 85kg x 60gtts/ml
10,000mcg/ml
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
10 x 85 x 60
10,000 gtts/min
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
1 x 85 x 6
100 gtts/min
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
85 x 6
100 gtts/min
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
510
100 gtts/min
Practice
• DD - 10mcg/kg/min
• Wt - 85kg
• SS - 60gtts/ml
• C - 500mg/50ml
5.1gtts/min
Conclusion