Dim. Ana. - gtt rate
1. Units and Conversion 1.6) Dimensional Analysis 1.6.1) Dimensional Analysis
1.6.1.1) Dimensional Analysis Easy 1
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An electronic infusion pump is calibrated as 21 gtt/mL. If 650 mL of IV solution needs to be administered over a period of 7 hours, then calculate the rate in drops per minute.
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lb equals 33 drops/min kg
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Since we need drops per minute as the final unit, we begin with the information which has 'drops' or 'gtt' in the numerator.
The gtt per mL is given as `(21\quad g t t)/(1\quadmL)`, which is our starting fraction.
`(21\quad g t t)/(1\quad mL)�(650 \quad mL)/(7\quad hr) � (1\quad hr)/(60\quad min)`
`= (32.5\quad drops)/min`
Which is `33 \quad (drops)/min` after rounding up to whole number. Ans.