Intravenous morphine therapy is started for a patient. The doctor order you to add 1.0 grams of morphine to 250 mL of an IV solution and deliver it to the patient at 4.0mg/min. In this particular IV, 20. drops is equal to 1.0 mL. What is the flow rate in drops per minute?
Thanks!
Thanks!
-
(1).. use dimensional analysis
(2).. start with the thing you want to convert FROM on the left and convert to the right
(3).. arrange the "unit factors" so that the units cancel out appropriately.
(4).. setup the conversion first, then run the calcs
the conversion...
(4.0mg / min) x (1g / 1000mg) x (250mL / 1.0g) x (20. drops / 1.0mL) = 20. drops / min
the calcs'
4.0 / 1000 x 250 x 20 =
*******
notice how I started with 4.0mg / min? that is the "from" in the problem statement
notice how the units cancel
..mg... ..g... .. . mL... drops.... ....drops
------ x ------ x ------ x ------- ==> --------
.min.. ..mg...... g..... ...mL ...... ....min
notice how..
.. mg / mg
.. g / g
.. mL / mL
all cancel out leaving
.. drops / min
*********
questions?
(2).. start with the thing you want to convert FROM on the left and convert to the right
(3).. arrange the "unit factors" so that the units cancel out appropriately.
(4).. setup the conversion first, then run the calcs
the conversion...
(4.0mg / min) x (1g / 1000mg) x (250mL / 1.0g) x (20. drops / 1.0mL) = 20. drops / min
the calcs'
4.0 / 1000 x 250 x 20 =
*******
notice how I started with 4.0mg / min? that is the "from" in the problem statement
notice how the units cancel
..mg... ..g... .. . mL... drops.... ....drops
------ x ------ x ------ x ------- ==> --------
.min.. ..mg...... g..... ...mL ...... ....min
notice how..
.. mg / mg
.. g / g
.. mL / mL
all cancel out leaving
.. drops / min
*********
questions?