iv calcualtions... again

0 here i am needing help w/ iv calculations again! any help/advice would be greatly appreciated!! here's my problem:
add 10,000 units of heparin to 500 mL D5W and infuse @ 100 unit/hr
calculate the flow rate in ml/min
i also need some assistance here too cuz i have no clue where to start on this one!:
dobutamine 250 mg in 250 ml of D5W at 3.5 mcg/kg/min. determine rate in mcgtt/min for pt who weighs 120 lbs.
THANK YOU!!!!!!! 

Jan 21, '08 by NewTravelingNurseQuote from ilovematt48On the first one. The ratio is 20 units per ML.here i am needing help w/ iv calculations again! any help/advice would be greatly appreciated!! here's my problem:
add 10,000 units of heparin to 500 mL D5W and infuse @ 100 unit/hr
calculate the flow rate in ml/min
i also need some assistance here too cuz i have no clue where to start on this one!:
dobutamine 250 mg in 250 ml of D5W at 3.5 mcg/kg/min. determine rate in mcgtt/min for pt who weighs 120 lbs.
THANK YOU!!!!!!!
100/20 gives 5ml per hour. Divide by 60 and you get 0.08333333 or 8.3 mcg per minute.
ON the second one. How about this:
250mg/250ml = 1mg per 1ml
120# = 54.545Kilo
54.545 * 3.5 mcg = 190.90 MCG per minute
Then you need to know the type of tubing you have. Divide that into the above..
Hope that helps more than it confuses.... 
Jan 21, '08 by Daytonitefirst off, i work these problems in dimensional analysis which you really should learn to do. it will make your life a whole lot better in calculating these problems. it is also known as the factor/label method. you can find short tutorials on dimensional analysis on post #3 of this thread:
 http://allnurses.com/forums/f50/nurs...ad264395.html  the nursing math thread (in the general nursing student discussion forum)
Quote from ilovematt48add 10,000 units of heparin to 500 ml d5w and infuse @ 100 units/hour. calculate the flow rate in ml/min.dose desired: 100 units/hour
dose on hand: 10,000 units/500 ml
conversion factor: 60 minutes = 1 hour
100 units/1 hour (dose desired) x 500 ml/10,000 units (dose on hand) x 1 hour/60 minutes (conversion factor) = 0.08333 ml/minute, rounded off to 0.08 ml/minute
Quote from ilovematt48dobutamine 250 mg in 250 ml of d5w at 3.5 mcg/kg/min. determine the rate in microdrops/min for a patient who weighs 120 lbs.dose desired: 3.5 mcg/kg/minute
dose on hand: 250 mg/250 ml
patient weight: 120 pounds
conversion factor: 1 kilogram = 2.2 pounds
conversion factor: 1 milligram = 1000 micrograms
you must know that microdrop tubing delivers 60 drops/1 ml
3.5 mcg/1 minute (dose desired) x 250 ml/250 mg (dose on hand) x 120 pounds/2.2 pounds (patient weight conversion to kg) x 60 gtts/1 ml (drop factor of iv tubing) x 1 mg/1000 mcg (conversion factor) = 11.45 drops/minute, rounded off to 11 drops/minute (a drop cannot be a fractional part)Last edit by Daytonite on Jan 21, '08