Transcript ml/min
Base Hospital 2003 Fall Recerts. Medical Math and Drug Calculations mg/kg/min ml/cc Milligrams Kilograms Milliliters Making Sence of Medical Math gtts/min gtts/min mg Kilograms mg/kg/min Milligrams mg/kg/min Milliliters Kilograms ml/cc Milligrams ml/cc gtts/min Kilograms ml/cc mg mg/kg/min gtts/min Kilograms Milliliters ml/cc gtts/min Kilograms Milliliters gtts/min mg mg mg/kg/min ml/cc mg Milligrams Milliliters Milligrams mg 2 Pre/Post Course Math • Overall well done • Some problems were found in the Precourse – Paramedics did not show their work, therefore it was hard to determine the problem. 3 •Calculators and medication tables are more than welcome, only if you intend on using them in your practice. •You are encouraged to use the formulas supplied. If you have your own method and it works for you, do it your way. 4 Where will I apply medical math?? 5 HOW MUCH TO ADMINISTER WANT ---------- = AMOUNT TO ADMINISTER HAVE 6 WANT • Protocols I.e. 0.3mg Epi. 1:1,000 SC • Verbal Orders by patch phone • Written Orders on Patient chart 7 HAVE • Concentration of the Drug – Nitro, Salbutamol, Glucagon, Lidocaine, etc. • Contents of the IV Bag • Amount in a given Ampoule or Vial 8 Weight vs. Volume REMEMBER Weight and Volume are not the same thing Weight is the amount of a drug -5.0mg of Ventolin Volume is the amount of fluid the drug is dissolved in - 2.5 ml nebule 9 Have = Concentration Weight Concentration = Volume 10 Concentration • • • • • • • • mol/L G/L G% or % mg% Eq/L m/Eq/L mg/ml mcg/ml • • • • • • • • moles per litre grams per litre grams/100mL mg per 100 mL equivalents/ L milliequivalents per litre milligrams/millilitre micrograms/millilitre 11 Concentration Reduce the Volume to 1 ml which will make the math easier mg/ml 100 mg in 20 ml = 5 mg/ml 250 mg in 100 ml = 2.5 mg/ml 60 mg in 15 ml = 4 mg/ml 12 Injection - ml Amount Ordered = Amount to Administer (ml) Concentration 0.3 mg 50 mg 5 mg/ml 0.3 mg 5mg/2ml = 10 ml = 0.12 ml = 0.3 ml 1 mg/ml 1.25 mg = 0.625 ml 5 mg/2.5ml 13 Infusion - ml/min Amount Ordered = Amount to Administer (ml/min) Concentration 20 mcg/min 200 mcg/ml 1 mcg/min = 10 mcg/ml 15 mg/min 5 mg/ml = 0.1 ml/min 3 mg/min = 3 ml/min 10 mg/ml = 0.3 ml/min 14 Infusion gtt/min Amount Ordered Concentration 20 mcg/min X drip factor = Amount to Administer (gtt/min) = 0.1ml/min x 60 gtt/ml = 6 gtt/min 200 mcg/ml 15 mg/min 5 mg/ml 3 mg/min = 180gtt/min 10 mg/ml = 18gtt/min 15 Weight Based Infusion Amount Ordered x Weight =Amount to administer Concentration Factor (ml/min) 10 mcg/kg/min x 80 kg = 1ml / min 800 mcg/ml If drop/ minute are required multiply by drop factor x 60 gtt/ml = 60 gtt/min 16 Single Strength Dopamine Chart mcg/kg 800 400 200 100 50 gtts 60 30 15 7.5 3.75 17 Double Strength Dopamine Chart mcg/kg 1600 800 400 200 100 50 gtts 60 30 15 7.5 3.75 1.875 18 Using the Chart System 1. Estimate the patients weight in kg and round to nearest 10’s. 2. Multiply the (weight) x (order). 3. Use chart to add up drip rate. 4. Run IV at approximate rate or use an infusion pump. 19 IV concepts Two concepts: 1. Flow rate: the rate at which IV fluid is given. 2. The drip factor: the number of drops per mL determined by the administration set. 20 Infusion = ml/hr Calculate the drip rate when the Physician Orders - 400 ml/hr using a 10 gtts/ml drip set 400 ml/hr x 10 gtts/ml 4000 gtts/hr ÷ 60 min/hr 66.67 gtts/min ÷ 60 sec/min = 1 gtt/sec 21 REMEMBER WANT ---------HAVE = AMOUNT TO GIVE • The WANT may get more complicated involving time or patient weight. • The HAVE is in your possession and may change in concentration depending on service supplies. 22 Questions? 23