Quick Fentanyl CRI Bag

Add 1ml/kg of fentanyl (0.05mg/ml) to a 50ml bag of saline.
@ 3-6ml/hr = 3-6mcg/kg/hr
will last 8 – 16 hours

Advertisements

MLK / FLK CRI

Loading doses:
Morphine: 0.5mg/kg IM
Lidocaine: 1 mg/kg IV
Ketamine: 0.25 – 0.50 mg/kg IV

CRI in a bag:
Morphine (15 mg/ml) 8ml/L
Lidocaine (20 mg/ml ) 50ml/L
Ketamine (100 mg/ml ) 1.2ml/L
@ 1ml/kg/hr
=
Morphine 2 ug/kg/min or 0.12 mg/kg/hr
Lidocaine 17 ug/kg/min or 1.0 mg/kg/hr
Ketamine 2 ug/kg/min or 0.12 mg/kg/hr

Can go up to 3ml/kg/hr without exceeding any dose ranges

Cats – until more data is obtained, lidocaine’s use in cats cannot be recommended due to potential toxicity issues. If it is used in cats, do not exceed 10 ug/kg/minute, and monitor carefully for seizure activity and cardiac abnormalities (bradycardia).

CATS – LIDOCAINE (20 mg/ml): 300 mg/500 ml diluent = 15 ml/500 ml diluent = 30 ml/1000 ml diluent
Deliver at 1ml/kg/hr fluid rate = 10 ug/kg/min or 0.6 mg/kg/hr

To substitute fentanyl for morphine at a dose equipotent to the morphine dose above add:
FENTANYL (0.05 mg/ml): 0.6 mg/500 ml = 12 ml/500 ml diluent = 24 ml/1000 ml diluent.
Deliver at 1ml/kg/hr fluid rate = 0.02 ug/kg/min or 0.0012 mg/kg/hr

Source: http://www.vasg.org/constant_rate_infusions.htm

Fluid Losses

  • Insensible losses (respiratory) = 22 – 33 ml/k/day (0.9 – 1.3 ml/kg/hr)
    Sensible losses (Urinary) =26 – 44 ml/kg/day (1 – 1.8 ml/kg/hr)
    Total maintenance = 44 – 99 ml/kg/day (1.9 – 3.1 ml/kg/hr)
    Average = 2.5ml/kg/hr
  • Insensible loss is almost pure water (hypotonic fluid loss)
    Sensible loss is an isotonic fluid loss
  • Vomiting, diarrhea, osmotic diuresis are all isotonic losses
    Diabetes insipidus, panting, water deprivation are hypotonic losses
    Addison’s disease is a hypertonic loss

Fluid Compartments

Total body water = 60% of body weight
Intracellular water = 40% of body weight
Extracellular water = 20% of body weight
Interstitial water = 16% of body weight
Plasma water = 4% of body weight

Intravascular volume = 7% of body weight (plasma volume + RBC volume)
Hematocrit = 3% (RBC volume) / 7% (intravascular volume) = 43%
Note that IV volume is part extracellular and part intracellular