Category: Paeds

0-12yrs WETFLAG

Tips: 

  • If particularly BiIG – go up 1-2 yrs
  • If particularly SMALL – go down 1-2 yr
  • Prepare ET Tubes 0.5mm bigger and smaller
  • Chid’s weight known – specific calculations can be found after tables.

Boys 0-14yrs

AgeBirth1mth3mth6mth12mth18mth2yr3yr4yr5yr6yr7yr8yr9yr10yr11yr12yr14yrAge
Weight3.5kg4.5kg6.5kg8kg9.5kg11kg12kg14kg16kg18kg21kg23kg25kg28kg31kg35kg43kg50kgWeight
Energy20J20J30J30J40J40J50J60J60J80J80J100J100J120J130J140J150J150JEnergy
Tube 3.0/3.5mm3.5mm3.5mm4mm4.5mm4.5mm4.5mm5mm5mm5.5mm5.5mm6mm6mm6.5mm6.5mm6.5mm7.5mm8mmTube
Fluid-Medical70ml90ml130ml160ml200ml220ml240ml280ml320ml360ml420ml460ml500ml500ml500ml500ml500ml500mlFluid-Medical
Fluid - Trauma 35ml45ml65ml80ml100ml110ml120ml140ml160ml180ml210ml230ml250ml250ml250ml250ml250ml250mlFluid-Trauma
Lorazepam 0.4mg0.5mg0.7mg0.8mg1.0mg1.1mg1.2mg1.4mg1.6mg1.8mg2.1mg2.3mg2.5mg2.8mg3.1mg3.5mg4.0mg4.0mgLorazepam
Adrenaline 1:10'0000.4ml0.5ml0.7ml0.8ml1.0ml1.1ml1.2ml1.4ml1.6ml1.8ml2.1ml2.3ml2.5ml2.8ml3.1ml3.5ml4.3ml5.0mlAdrenaline 1:10'000
Glucose 10% (ml)7ml9ml13ml16ml19ml22ml24ml28ml32ml36ml42ml46ml50ml56ml62ml70ml86ml100mlGlucose 10%

Girls 0-14yrs

AgeBirth1mth3mth6mth12mth18mth2yr3yr4yr5yr6yr7yr8yr9yr10yr11yr12yr14yrAge
Weight3.5kg4.5kg6kg7kg9kg10kg12kg14kg16kg18kg20kg22kg25kg28kg32kg35kg43kg50kgWeight
Energy20J20J30J30J40J40J50J60J60J80J80J90J100J120J130J140J150J150JEnergy
Tube 3.0/3.5mm3.5mm3.5mm4mm4.5mm4.5mm4.5mm5mm5mm5.5mm5.5mm6mm6mm6.5mm6.5mm6.5mm7.5mm8mmTube
Fluid-Medical70ml90ml120ml140ml180ml200ml240ml280ml320ml360ml400ml440ml500ml500ml500ml500ml500ml500mlFluid-Medical
Fluid - Trauma 35ml45ml60ml70ml90ml100ml120ml140ml160ml180ml200ml220ml250ml250ml250ml250ml250ml250mlFluid-Trauma
Lorazepam 0.4mg0.5mg0.6mg0.7mg0.9mg1.0mg1.2mg1.4mg1.6mg1.8mg2.0mg2.2mg2.5mg2.8mg3.2mg3.5mg4.0mg4.0mgLorazepam
Adrenaline 1:10'0000.4ml0.5ml0.6ml0.7ml0.9ml1.0ml1.2ml1.4ml1.6ml1.8ml2.0ml2.2ml2.5ml2.8ml3.2ml3.5ml4.3ml5.0mlAdrenaline 1:10'000
Glucose 10% (ml)7ml9ml12ml14ml18ml20ml24ml28ml32ml36ml40ml44ml50ml56ml64ml70ml86ml100mlGlucose 10%

Calculations

  • Energy (J) [max 150J] =4 x Weight(kg)
  • Fluid Medical (ml) = 20 x Weight(kg)
  • Fluid Trauma (ml) = 10 x Weight(kg)
  • Lorazepam (mg) [max 4mg] = 0.1 x Weight(kg)
  • Adrenaline 1:10’000 (ml) [max 10ml] = 0.1 x Weight(kg)
  • Glucose 10% (ml) = 2 x Weight(kg)

Information from APLS Aide-Memoire

 

Purple Glove Syndrome – Case

Is a rare complication of I.V. Phenytoin, which presents with a triad of: Pain, Oedema & Discolouration, typically in the hand.

In our case a child presented in status epilepticus, having received rectal diazepam from the ambulance crew, then 0.1mg/kg lorazepam in the ED, followed by 20mg/kg I.V. Phenytoin over 30 min, via a 24g cannula in back of the hand.

After intubation the patients thumb, index and middle fingers were all noted to be purple. Radial pulse was weak however, we saw good flow on ultrasound doppler in the ED. The patient had no cardiovascular Hx or FHx.

 

What the literature says

Mechanism (poorly understood)

  • Phenytoin is highly Alkaline and may induce vasoconstriction and thrombus, resulting in  leakage into the extravascular tissue.
  • Phenytoin may precipitated when it mixes with acidic blood (More common in status patients rather than prophylaxis)
  • I.V. Canulation may cause small tears promoting extravasation (In our case the cannula required repositioning on insertion)

Prevention

  • Phenytoin infusion rate should be the lesser of 1-3mg/kg/min OR under 50mg/min (In our case the infusion rate was 22mg/min, less than 1mg/kg/min)
  • Smaller hand veins should be avoided (As in our case, most reports in literature involve the use of hand veins)
  • Use 20G cannula or larger (This is ideal for adults and older children)

Stages

  1. Dark purple Pale blue discolouration occurs around or distal to injection site 2-12hrs after administration. (In our case approx 30 min)
  2. Discolouration and Oedema progresses around site and into fingers, hand and forearm over the next 12-16 hours
  3. Healing, starts at the periphery  moving towards the injection site – most patients have a full recovery over 72hrs (few cases of necrosis requiring amputation have been reported

Treating

  • Stop giving phenytoin
  • Dry Warm Heat (moist heat my contribute to skin breakdown)
  • Elevate
  • Analgesia
  • Regular neuromuscular assessments
  • Avoid Cold (this will worsen the vasoconstriction)
  • GTN patches have also been used in several of the cases but efficacy is unknown

Learning Points

  • Avoid Hand veins for I.V. Phenytoin (this seems to be a contributing factor form the evidence, be it due to small size or more frequent injury of the vein though need to reposition?)
  • Avoid Cannulas that required repositioning (increase chance of leaking)
  • Use a big cannula (easier said than done in a fitting child)

 

References