Dosage Calculation interrogate...?
I finished school a fews months ago and need to brush up on math to take boards...Need a refresher on these.
Dr. ordered Dopamine 3 mcg/kg/min
Your pt. weigh 187lb
You have on hand 400mg Dopamine in 250ml D5W
Drop factor: 15gtts/min
at what rate would you run the IV
Now, I know Pt counterweight = 85kg
which=255mcg/min
which=0.255mg/min
then 0.255mg/400x250=0.159375mg/min
then 0.159375mgx60=9.56ml/hr
can't remember what to do with gtt factor
Answers:
Just a couple suggestions. Most far-reaching, ALWAYS include the units in your calculations (you didn't and made a classic 'units' mistake). If the unit left over after you cancel where appropriate are what's required contained by the answer, then your setup is probably correct. Secondly, if you are working with mcg and mg in one and the same problem, it's better to convert the mg into mcg, in which you are still dealing with whole numbers.
187lb * (1kg/2.2lb) = 85kg
85kg * 3mcg/kg/min = 255mcg/min
400mg = 400000mcg
255mcg/min * (250ml/400000mcg) = 0.16ml/min (notice your unit!)
Drop factor should be 15gtt/ml (not min)
0.16ml/min * 15gtt/ml = 2.4gtt/min
(5gtts in 2min, easier to count)
If you have any questions you can email or IM me. Source(s): Pharmacist
You own almost solved.
15drop =1ml
you have to run 10ml /hr
ie,10x15=150dro/60min
or 2.5drop/min Source(s): so far i can think
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Dr. ordered Dopamine 3 mcg/kg/min
Your pt. weigh 187lb
You have on hand 400mg Dopamine in 250ml D5W
Drop factor: 15gtts/min
at what rate would you run the IV
Now, I know Pt counterweight = 85kg
which=255mcg/min
which=0.255mg/min
then 0.255mg/400x250=0.159375mg/min
then 0.159375mgx60=9.56ml/hr
can't remember what to do with gtt factor
Answers:
Just a couple suggestions. Most far-reaching, ALWAYS include the units in your calculations (you didn't and made a classic 'units' mistake). If the unit left over after you cancel where appropriate are what's required contained by the answer, then your setup is probably correct. Secondly, if you are working with mcg and mg in one and the same problem, it's better to convert the mg into mcg, in which you are still dealing with whole numbers.
187lb * (1kg/2.2lb) = 85kg
85kg * 3mcg/kg/min = 255mcg/min
400mg = 400000mcg
255mcg/min * (250ml/400000mcg) = 0.16ml/min (notice your unit!)
Drop factor should be 15gtt/ml (not min)
0.16ml/min * 15gtt/ml = 2.4gtt/min
(5gtts in 2min, easier to count)
If you have any questions you can email or IM me. Source(s): Pharmacist
You own almost solved.
15drop =1ml
you have to run 10ml /hr
ie,10x15=150dro/60min
or 2.5drop/min Source(s): so far i can think
Related Questions: