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Drug Calculation mohammed alhabsi indanan, RN

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Drug Calculation mohammed alhabsi indanan, RN

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    1. Drug Calculation mohammed alhabsi indanan, RN

    2. sketch out of my talks Conversion Methods of Calculation Intravenous Flow rate Calculation Continuous Infusion Common Drug infusion & how they are given Exercises

    3. Conversion Nanograms Micrograms Milligrams Grams Kilograms ml L

    4. Methods of Calculation Basic Formula Ratio & proportion Fractional Equation

    5. Basic Formula D = Desired dose H = Dose on Hand V = Vehicle-tablet or liquid D H

    6. Basic Formula: Example: Order – Dilantin 50mg orally TID Drug Available-Dilantin 125mg/5ml D=50mg H=125mg V=5ml 50 250 125 125

    7. Ratio & proportion

    8. Ratio & proportion HX = DV DV H Order-Keflex 1gm orally TID Drug Available-Keflex 250mg/capsule D= 1gm (note: need to convert to mg) H= 250mg V= 1 capsule

    9. Ratio & proportion:

    10. Fractional Equation Cross multiply & solve for X

    11. Fractional Equation Order: Digoxin 0.25mg orally per day Drug available: 0.125mg per tablet D=0.25mg H=0.125mg V=1 tab

    12. Intravenous Flow Rate Calculation Step 1- amount of fluid divided by hours to administer = ml/hr Step 2- ml/hr x gtts/ml 60 min Amount of fluid X gtts/ml___ hours to administer X min/hr

    13. Intravenous Flow Rate Calculation 1000ml over 8 hrs IV set= 15gtts/ml Step 1: Step 2:

    14. Intravenous Flow Rate Calculation 1000 X 15 15000 8hrs X 60 480

    15. Continuous Infusion calculation Note: always look 1st for DC mg/min (Lidocaine, Pronestyl) Desired dose X 60 Drug mg Drug mg X cc/hr_____ Solution cc X 60 min/hr

    16. Continuous Infusion calculation

    17. Continuous Infusion calculation mcg/min (For example - Nitroglycerin) Desired dose X 60 Drug mcg Drug mcg X cc/hr____ Solution cc X 60min/hr

    18. Continuous Infusion calculation

    19. Continuous Infusion calculation mcg/kg/min (Dopamine,Dobutamine,Nipride etc.) A. To calculate cc/hr

    20. mcg/kg/min Dopamine 400mg/250ml D5W to start at 5mcg/kg/min. weight is 86kg. Look for Dilution Concentration… 400mg X 1000mcg = 400,000mcg 250ml = 1600mcg/ml Next step:

    21. mcg/kg/min Dopamine 400mg/250ml D5W to start at 5mcg/kg/min. weight is 86kg. 5 X 86 X 60 1600 = 16.1ml/hr

    22. mcg/kg/min Dopamine 400mg/250cc D5W to start at 5mcg/kg/min. weight is 86kg. 250cc_ 400,000mcg

    23. Continuous Infusion calculation mcg/kg/min B. To calculate mcg/kg/min Drug mcg/ X cc/hr________ Solution cc X 60min/hr X kg

    24. Continuous Infusion calculation mcg/kg/min Nipride 100mg/250cc D5 was ordered to decrease BP. wt 143 lbs, IV pump is set at 25cc/hr. How many mcg/kg/min of Nipride is the pt. receiving? 100,000mcgX25cc/hr 2,500,000 250ccX 60 X 65kg 975,000

    25. Continuous Infusion calculation How to calculate mcg/kg/min if you know the rate of infusion? Dosage in (mcg/cc/min)Xrate on pump Patient’s weight in kg Look 1st for dosage concentration for all drug calculation.

    26. Look 1st for dosage concentration for all drug calculation 400mg of Dopamine in 250cc D5W 400,000mcg 250ml 1600mcg/ml 60min/hr

    27. How to calculate mcg/kg/min if you know the rate of infusion? If you have a 75kg pt. for example… 26.6mcg/cc/min X 10ml on pump Patient’s weight in kg (75kg) = 3.5mcg/kg/min

    29. Common Drug infusion & how they are given

    30. Common Drug infusion & how they are given

    31. LET’S DO SOME EXCERCISES.. 3 L of IV LR is charted over 12hrs. The drop factor is 15. the IV has been running for 9hrs. 800ml remains. How many drops per minute are needed so that the IV finishes in the required time?

    32. LET’S DO SOME EXCERCISES.. The doctor has decided to intubate your 100kg patient who has gone into acute respiratory distress. As the doctor prepares to intubate, he ask you to give 2.5mg/kg of propofol (10mg/ml) IVP. How many ml of propofol will you give?

    33. LET’S DO SOME EXCERCISES.. A patient has daily fluid allowance of 1500ml. The patient has taken 30%. How many ml is this?

    34. LET’S DO SOME EXCERCISES.. A child is prescribed erythromycin. The recommended dosage is 40mg/kg/day , 4 doses daily. If the child’s weight is 15kg, calculate the size of a single dose?

    35. LET’S DO SOME EXCERCISES.. Dopamine 400mg in 250cc of D5W to infuse at 5mcg/kg/min. The patient’s weight is 200lbs. How many cc/hr would this be on an infusion pump?

    36. LET’S DO SOME EXCERCISES.. The physician orders Ampicillin 500mg q6h orally (po). Ampicillin is available: 250mg capsule (cap). How many capsules would you administer q6h?

    37. LET’S DO SOME EXCERCISES.. A 26 yr old man is to be given 2700ml of LR solution IV over a period of 18hrs. In addition, the amount of blood lost every 3hrs is to be replaced by packed RBC during the next 3hrs. Between the hours of 1000H & 1300H, the man lost 120ml. At what rate should fluid be delivered between 1300H and 1600H?

    38. MAGSUKUL….

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