Hi all! I have a question regarding an assignment for "Math for Meds." I have the answers, which are confirmed correct via a given answer key. While, I figured out how to do the calculation, I am confused/concerned about the rational.
This involves questions of "Safe loading dose."
Pt with CHF has an order for theophylline 300 mg in 50 mL D5W over 30 minutes. Pt weighs 68kg.
The lable provided states:
IV (adult with CHF) Loading dose-4.7mg/kg
It calculates out to 319.6 mg (safe loading dose) per hour
The answer key states: YES, it is a safe loading dose.
This is what I am confused/concerned about:
- the pt is supposed to get 300mg in 30 minutes....
so if I divide the 316.9 by 2 (to account for the 30 minute infusion time) I get 159.8mg
How and why is this safe? Yes 159.8mg is under 300mg (or 319.6 mg for that matter)... so they are not going to "OD" but how is it safe to not receive the 300mg (as ordered)... wouldn't this make the loading dose and/or order ineffective?
Thank you in advance! I am going to ask my professor in the morning, but this is kinda driving my mind bonkers, so I thought I would reach out to the allnurses community.
Again, thank you, I look forward to hearing back from the community.
