### 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 18 gtt/mL. If 500 mL of IV solution needs to be administered over a period of 4.5 hours, then calculate the rate in drops per minute. Click on the button below to see the answer and explanations

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lb equals 33 drops/min kg

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 (18\quad g t t)/(1\quadmL), which is our starting fraction.

(18\quad g t t)/(1\quad mL)�(500 \quad mL)/(4.5\quad hr) � (1\quad hr)/(60\quad min)

= (33.333333333333\quad drops)/min

Which is 33 \quad (drops)/min after rounding up to whole number. Ans.

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