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Discussion

Math calc help Please

  • a patient is receiving lidocaine at 30ml/hr via a volumetric pump. the concentration of lidocaine is 2grams/250ml's of d5w. how many mg/min is the patient receiving? :banghead:

i got mg/min = 2000mg/250ml x 30/ml/hr x hr/60min = 4mg/min.

how do i solve this problem in another way solving from mg/hr to mg/min? showing the steps ... i hope i am asking this question correctly....:)

i know if you take 2000mg/250ml = 8mg/ml.

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  • Experts

by dimensional analysis: i set up the equation so i am going to end up with a fraction that has mg in the numerator and minutes in the denominator:

30 ml/1 hour
(rate of infusion)
x 2 grams/250 ml
(dose on hand)
x 1 hour/60 minutes
(conversion factor)
x 1000 mg/1 gram
(conversion factor)
=
4 mg/minute
(dose desired)

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