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    • #48461
      Anonymous

      Can you please highlight the body weight considerations for TPN in obese patients.
      Should we use IBW or Adjusted body weight ?

    • #48463
      TDP
      Keymaster

      The common practice for calories and protein requirements calculation in obese patients is using actual weight for calories and Ideal body weight for protein.
      This practice is followed by ASPEN
      The recommendation for calories and protein for stable adult obese patients:

      View post on imgur.com

      Calories Amino Acids Fat
      Grade I obesity 15-20 Kcal/Kg (ABW)/day 2 gm/kg (IBW)/day 0.3-0.5 gm/kg (IBW)/day

      Grade II Obesity 10-15 kcal/kg (ABW)/day 2 gm/kg(IBW)/day No need for the first week, start with small dose 0.3-0.5 gm/kg (IBW)/day if patient is still NPO in order to prevent EFAD

      Grade III Obesity 10-15Kcal/Kg (ABW)/day >2 gm up to 2.5 gm/kg/day NO need for the first week, start with small dose 0.3-0.5 gm/kg (IBW)/day to prevent EFAD

      Some clinicians use Adjusted body weight for calories requirements. If so, you may add up to 20% additional to the above numbers for calories.

      Also, close attention must be paid to other micronutrient deficiencies like vitamins and trace elements. They may need mega doses and off course to monitor those levels and adjust accordingly like fat soluble vitamins, vitamin B1 and B12, selenium, zinc, and copper.

      For calories, you have the other option of using IBW and the range will be 20-22 kcal/kg. I tried both ways ( IBW and ABW) and all will end by the same numbers.

      There are different schools: we use Adjusted Body Weight (AjBW) for any patient who is 20% above IBW. (some references state 30%)

      Estimate Ideal body weight in (kg)

      Males: IBW = 50 kg + 2.3 kg for each inch over 5 feet.

      Females: IBW = 45.5 kg + 2.3 kg for each inch over 5 feet.

      AjBW = IBW + 0.4( ABW* – IBW)

      *ABW is Actual Body Weight

    • #48468
      TDP
      Keymaster

      Hope that answered your question.

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