iv problem

by karen
(indiana)

A patient is receiving an infusion from a 500 ml bag containing a 0.5% solution of drug solution.the drop factor is calibrated at 12 gtt/ml and the flow rate is set to 10 gtt/min. If the infusion is to run 4 hours, how much of the active drug will the patient receive ?

Comments for iv problem

Click here to add your comments

Dimensional analysis method
by: Brad Wojcik, Pharm D

You are starting off with hours and have to end up with mg or g (we can use either one). The first step is to calculate how many g are in the 500 mL. 500ml(0.5g/100mL)= 2.5 g. Now you have a given, a bunch of ratios and the units of the answer. Just line everything up so that the units cancel out and you end up with g
4h(60min/h)(10gtt/min)(1mL/12gtt)(2.5g/500mL)=1g


Agree with Brad + another method
by: Keith

Using an equation is another method - but may take a tad bit longer.

1) Figure out how many mL patient will receive during duration:

- How many drops total:
240 min X 10gtt/min = 2400gtt

- How many mL that adds up to
2400gtt
------------ = 200mL
12gtt/mL

2) Multiply received volume by sol. strength:

0.5g - - - - - - - - - - X
-------- = 0.5% = ---------
100mL - - - - - - 200mL

Click here to add your comments

Join in and ASK your Questions! It's easy to do. How? Simply click here to return to Math questions.

Popular Pages

More Info

Search