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  • Sumanta 12:38 PM on December 10, 2014 Permalink |
    Tags: Calculation   

    How to calculate pediatric drug doses? 

    Calculation of pediatric dosages are many a times cumbersome job for medical practitioners of non-pediatric branches. So, here is a simple way of calculation of pediatric drug doses.

    Generally you need to know 2 things before prescribing a medicine – the dosage and the preparation in which it is available in the market.

    Let’s try to explore the issue with an example.

    Suppose we want to prescribe a paracetamol syrup.

    First we have to calculate the dosage. So if we want to give at the dose of 15 mg/kg/dose for a 20 kg weight child the dosage will be 300 mg per dose.

    Next we have to see at what strength in the market paracetamol is available. Suppose there is a preparation of paracetamol in which 120 mg paracetamol per 5 ml syrup.

    So we have to calculate the amount of dosage of syrup we have to give.

    A easy way to count dosage is as following-
    Dose calculated/dose available x volume = 300/120 x 5 = 12.5 ml

    So, 12.5 ml paracetamol is to be given per dosage to the above mentioned example.

    By using the formula above almost any drugs dosage can be derived.

  • Sumanta 12:29 PM on December 5, 2014 Permalink |
    Tags: Calculation, ,   

    Intravenous fluid requirement calculations 

    One common problem encountered by medical students, nursing students and sometimes even to practicing doctors is intravenous (iv) fluid calculation.

    There may be various ways to determine how much maintenance fluid to be given intravenously, however the author will discuss here one commonly practiced technique practiceed by certain medical practitioners.

    First you should be oriented with the formula depicted below in the diagram –

    To explain the above diagram –

    -For body weight of first 10 kgs we give 100 ml/ kg / day.

    -For the next 10 kgs we give 50 ml / kg / day.

    -Finally, for the remaining body weight i.e. for those weighing more than 20 kgs we give in the rate of 20 ml / kg / day.

    For easy calculations it’s good to memorize the amount of iv fluids which might be needed for an individual weighing 10 and 20 kgs.

    For a 10 kg person iv fluid required is 10×100 =1000

    For a 20 kg person iv fluid requirement is –
    1000 + (10×50)= 1500.

    If you remember the above two values you can easily derive iv fluid requirements for various body weights more than 10 and 20 kgs.

    Now let us consider some examples –

    For a 8 kg child- 8×100= 800 ml per day.

    For a 12 kg child – 1000+ (2×50) = 1100 ml per day.

    For a 30 kg individual – 1500+ (10×20)= 1700 ml per day.

    Lastly, how to determine how much iv fluid to be given in each hour. For this simply divide ➗ the calculated total fluid requirement per day by 24; since 24 hours makes a day.

    The above writing is a simplified version for iv fluid requirement calculation made by the author which may not be free from errors. Hence, please cross check the information from reliable sources. ⚠

  • Sumanta 1:01 PM on December 4, 2014 Permalink |
    Tags: Calculation,   

    How to calculate intravenous fluid drop rate? 

    How to calculate intravenous fluid drop rate?

    We will discuss here how to calculate the number of drops of fluid to be given to a patient.

    We will do it by an example.

    Before we look into the example we should know that 1 ml of fluid is equal to 20 drops.

    Now we will begin.

    Suppose we need to give a particular drug in the rate of 50ml per hour. So, how many drops should go in one minute?

    Since 1 hour is equal to 60 minutes, 50/60=0.8333 ml is to be given in 1 minute

    As we discussed above 1ml = 20 drops

    So in this case 0.83 x 20=16.6 i.e. about 17 drops to be given in a minute

    Quite simple!

  • Sumanta 12:50 PM on October 7, 2014 Permalink |
    Tags: Calculation, Potassium   

    Calculation of potassium requirement in children? 

    Today we will discuss how to calculate the quantity of potassium to be added in the maintenance fluid i.e. the amount of potassium required for our body.

    2 Things to know before calculation of potassium requirement –

    -Potassium requirement of body is 2 mEq / kg bodyweight.
    -1 ml KCl is equal to 2 mEq of K+

    Example calculation using the above 2 points :

    What will be the k+ requirement of a 10kg child.
    Using the requirements formula above the child will need 10×20= 20 mEq

    As discussed above 1 ml KCl is equal to 2 mEq of K+ ; so 20 mEq K+ will be equal to 10 ml of KCl.

    Some people use the following way to calculate:

    When you are planning to add k+ in maintenance fluid. Divide the required maintenance fluid by 100 and it will give you the required k+ in ml. The maintenance fluid requirement for a 10 kg child will be 10 x 100 = 1000 ml. So, the amount of K+ to add in it will be 1000/100 = 10 ml.

    PS- Information in this post may not be free of error. For correct information refer to genuine resources.

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