## Monday, January 4, 2016

### Dosage Calculation - Volume/Time - IV mL Rate Questions

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Volume/Time - IV mL Rate Questions

Given a certain amount of liquid and a time period, what is the necessary IV flow rate in mL/hr? Measurement used when IV regulated electronically by infusion pump.

Formula:

$\overline{)\frac{{\mathbf{Volume \left(mL\right)}}}{{\mathbf{Time \left(hr\right)}}}={\mathbf{Y\left(Flow Rate in mL/hr\right)}}}$

Example: Infuse 250 mL over the next 120 minutes by infusion pump.
$\frac{{\mathbf{Volume \left(mL\right)}}}{{\mathbf{Time \left(hr\right)}}}={\mathbf{Y\left(Flow Rate in mL/hr\right)}}$
Convert 120 minutes to hours.
min → hr    ( ÷ by 60 )
120 min ÷ 60 = 2 hr

$\frac{{\mathbf{250 mL}}}{{\mathbf{2 hr}}}=\overline{){\mathbf{125 mL/hr}}}$

Example: Ordered 1000 mL D5W IV to infuse in 10 hours by infusion pump.
$\frac{{\mathbf{Volume \left(mL\right)}}}{{\mathbf{Time \left(hr\right)}}}={\mathbf{Y\left(Flow Rate in mL/hr\right)}}$
$\frac{{\mathbf{1000 mL}}}{{\mathbf{10 hr}}}=\overline{){\mathbf{100 mL/hr}}}$

Question (17): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: I/V Hartmann's Solution 500 mL over 4 hours via infusion pump.

${\mathbf{\text{Rate:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL/hr}}}$
$\frac{{\mathbf{Volume \left(mL\right)}}}{{\mathbf{Time \left(hr\right)}}}={\mathbf{Y\left(Flow Rate in mL/hr\right)}}$
$\frac{{\mathbf{500 mL}}}{{\mathbf{4 hr}}}=\overline{){\mathbf{125 mL/hr}}}$

Question (21): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: I/V Hartmann's as per Parkland formula 4 mL/kg/%burns
Body Weight: 60 kg; %Burns: 30%
Volume to be infused over 24 hours: _______ mL; over first 8 hours:
_______ mL

The Parkland formula is a burn formula used to estimate the amount of replacement fluid required for the first 24 hours in a burn patient so as to ensure they remain hemodynamically stable. The first half of this amount is delivered within 8 hours from the burn incident, and the remaining fluid is delivered in the next 16 hours.

The first step is to estimate the amount of replacement fluid required for the first 24 hours for this particular patient.
This is a Dosage By Weight Question. 60 kg is the weight in kg, 4 mL/kg/%Burns and
30 %Burns is a dosage in terms of mL.
${\mathbf{Weight in Kg}}x{\mathbf{Dosage Per Kg}}x{\mathbf{%Burns}}={\mathbf{Y\left(Required Dosage\right)}}$
${\mathbf{60 kg}}x{\mathbf{4 mL/Kg/%Burns}}x{\mathbf{30 %Burns}}=\overline{){\mathbf{7200 mL over 24 hours}}}$

The first half of this amount is delivered within 8 hours from the burn incident.
$=\frac{{\mathbf{7200 mL}}}{{\mathbf{2}}}=\overline{){\mathbf{3600 mL over first 8 hours}}}$

Continue (to Amount in IV Fluid Questions)

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