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I set my solution up using dimensional analysis (remember chemistry?). It doesn't make sense to everyone, but this is how it works for my brain. I hope it helps.
1. 500mg/90 min x 1 g/1000mg x 250 mL/0.5 g x 12 gtt/1 mL = 33.3 = 33 gtt/min
2. 1000 units/1 hr x 500 mL/25,000 units x 1 hr/60 mins x 60 gtt/1 mL = 20 gtt/min
(It makes more sense if you write it out by hand)...
2. Dr order administer 1000 units heprin I.V every hour. Solution available is 25,000 units of heprin in 500 mL D5W. The administer set is microdrip (60 gtt/mL). Calculate gtt/min.
Dose: 1000 units
_______________ x 500ml = 20ml
Have: 25000 units
20 ml/hr x 60 gtt/ml
_________________ = 20 gtt/min
60min
Tiffie1210
71 Posts
I just took my med math test, for second year students we are required to get 100%. I had trouble with these two problems, could someone show me the simpliest way to solve them.. Thanks in advance
1. Dr order erythromicin 500 mg IVPB every 6 hours. Available to the nurse is 250 mL of NS with 0.5 G of erythromicin to infuse over 90 minutes. IV tubing delivers 12 gtt/mL. How many gtts min?
2. Dr order administer 1000 units heprin I.V every hour. Solution available is 25,000 units of heprin in 500 mL D5W. The administer set is microdrip (60 gtt/mL). Calculate gtt/min.