Please Help Me With Peds Math..or Ill Be In Big Trouble!

  1. confused: Hi everyone! Im hoping someone can help me...Ive been sitting here for hours and my mind is smoking!!! AHHHHH! Im doing my Peds rotation and I have to do a report on a patient and I cant figure out the math!!!!! Heres the info:

    Pt is 33 months old. 36 inches, 31 lbs. (68 kg.)
    One of the questions is askng to list the meds theyre taking and then calculate the patients safe dose range in 24 hours. The meds are:
    Ampicillin 100 mg/kg/day 350 reg IV q6h <-- the 350 reg IV confused me but thats how it was written
    Nysatin 100,000 u/ml to white plaque QID
    How in the heck do I figure it out?

    The next question asks:
    Calculate the pts 24 hour fluid needs, and hourly fluid needs. Include the rate if patient is receiving IV fluids. Heres what i got to so far:
    10 x 100 = 1000
    10 x 50= 500
    48 x 20 = 960 The answers total 2460 ml/24 hours
    Then I divided 2460 by 24 and got 102.5 ml/hour.

    Am i correct in that part? But what do they mean by including the rate for the IV????
    If anyone can help me I think Ill cry tears of joy!! I appreciate it sooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooo much!

    Thank you!!!!!!!!
  2. Visit nicoleinphilly profile page

    About nicoleinphilly

    Joined: Aug '02; Posts: 59
    telemetry nurse


  3. by   dstudent
    sorry no idea as I'm not there yet but good luck
  4. by   canoehead
    IV fluid rate is correct for a 68kg child. The Ampicillin should read 350mg, and the Nystatin we usually give 1mL po Q6H.

    However, a 68kg child would weigh 150lb, making him/her an adult. You went backwards when you calculated lbs to kg.

    I get 230mg Ampicillin per dose for 100 mg/kg/24h but I believe there is a range of 100-200mg/kg/24h depending on what is infected and MD preference. I don't have a reference book right here.
  5. by   mark_LD_RN
    thats looks correct canoehead

    rember to check the drug books for reccommended dosages real close with peds patients.

    here is something else you might find interesting NIcoleinphilly:

    Calculation of maintenance IV fluids in peds Patients;
    1) calculate peds patients weight in kilograms
    2)allow 100ml per kilogram for first 10 kilograms
    3)allow 50ml per kilogram for second kilogram
    4)allow 20ml per kilogramfor remainder of weight in kilograms
    5) divide total amout of above 4 steps by 24 hours to get hourly rate in ml per hour

    just for your info
    normal urine output should be 0.5 to 2ml/kg/hr depending on age and hydration status
  6. by   nicoleinphilly
    Thank you sooooooo much you guys! I finished (sighhhhh) finally!! I couldnt have done it without your help! Thank the lord for this website!

  7. by   wsiab
    31 lbs is not 68 kg (try dividing 31 by 2.2 instead of multiplying).... This is why the numbers are coming up so high, 68 kg is about 150 lbs ( that's one big three year old).