Albert #2 Flashcards
When is the liver functional?
1-2 Weeks Postnatal
When is the liver mature
6-12 months postnatal
Liver enzyme function is a _______ function
Postnatal
What are phase 1 liver functions.
- Oxidation
- Reduction
- Hydrolysis
What is the phase 2 liver function?
Conjugation
What 2 liver functions are functional at birth?
- Hydrolysis
- Sulfonation
Because liver function is still developing, _______ is increased for many drugs.
Half Life
Why is it OK to give acetaminophen to PEDS?
-Half life remains normal due to sulfonation.
Why is renal function limited at birth?
- ↑ vascular resistance
- ↓ blood flow
- ↓ GFR
When does renal function improve after birth?
Day 5
How long does obligatory Na loss last?
1st month
By the end of month 1 the kidney is ______ mature.
70%
biggest difference in PEDS fluid compartments?
ECF is 40% total body water
adults 20%
Where does the excess ECF in PEDS come from?
Interstitial fluid
Why do PEDS have more total body water 80 vs 60%?
Less muscle mass
Why do PEDS have increased metabolic rate?
increased fluid metabolism (greater % of TBW is exchanged perday)
Increased fluid metabolism leads to an increased risk of what?
Dehydration
What is the most marked electrolyte difference between PEDS and adults?
K
What is normal K in peds
5-6.5
A PEDS K of 3-3.5 represents a significant need for what?
Rehydration and electrolyte replacement
What leads to an increased risk if metabolic acidosis in PEDS?
Increased Cl
Decreased Bicarb
How can a slight acidosis be beneficial?
increased O2 delivery to tissues
Uptake and distribution in the GI tract is ________ in neonates.
Decreased
Why are inhalation agents faster in PEDS than adults?
- ↑ CO
- ↓ FRC
- ↑ Tidal volumes
- ↑ Tissue perfusion
Peds has _______ Plasma binding due to decreased ________.
Decreased
Plasma proteins
Increased membrane permeability is due to what?
- Incomplete mylenation
- Incomplete BBB
What slows onset of several drugs in peds?
ECF/TBW ratio
Renal clearance takes up to 2 years to reach adult levels, but most by when?
3 Months
When do enzyme levels mature?
1st 3 months of life
Describe basic maintenance fluid calculation for PEDS.
1st 0-10kg = 4ml/kg/hr
11-20kg = 2ml/kg/hr
21+ = 1ml/kg/hr
What are the blood volumes for Premie, 0-2, and 2-16 year olds
100 ml/kg
80 ml/kg
70 ml/kg
What procedures are 3rd space loss generally replaced?
Thoracic and intra abdominal
How much fluid should be given back for 3rd space?
2-10ml/kg over 2nd and 3rd hours
Instead of crytaloids, you should consider replacing the last _____ with ______.
25%
Blood
Other types of fluid loss.
- Respiratory loss
- GI loss
- Urine
Urine output should be?
1-2ml/kg/hr
What 2 things should be minimized?
- Tachycardia
- Hypotension
Best monitors for proper fluid intake?
- Urine production
- Proper BP
3 types of hydration
- Isotonic
- Hypotonic
- Hypertonic
What 4 things cause Isotonic (most common) dehydration?
- Pyloric obstruction
- bowel loss
- peritonitis
- starvation
What 3 things cause hypotonic dehydration?
- Fever
- Diarrhea
- Starvation
What 3 things cause hypertonic dehydration?
- Burns
- Sweating
- Diarrhea
What are the 3 degrees of dehydration in infants and children?
Mild 5 and 3%
Moderate 10 and 6%
Severe 15 and 9%
What type of fluid causes carries the greatest risk in rehydration and why?
Hypertonic fluid due to fluid shifts.
If hypertonic fluid is replaced too fast what can happen?
ceberal edema
Seizures
What type of acidosis is common in PEDS?
Metabolic
What are some common causes of metabolic acidosis in PEDS?
- Cold
- Hypoxia
- Dehydration
- hypotension
- poor perfusion
What is is about bicarb that warrants caution?
High osmolality
Bicarb administration can cause what problems?
Ceberal edema and hemorrhage
What is the classic example of metabolic alkalosis?
Pyloric stenosis
When is pyloric stenosis considered an emergency?
Never
What must be done prior to PEDS surgery?
- Fluid balance
- K correction
- Metabolic abnormalities fixed
Development of alkalosis is from loss of what?
H+
Metabolic alkalosis is a result of what, fluid loss from what?
Vomiting
Vomiting leads to a loss of what?
- H
- Cl
- H2O
Vomiting is an example of what kind of dehydration?
Isotonic
In metabolic acidosis, pH may increase to _______ and K to ______
- 7.5-7.6
- 3.0-3.5
Metabloic alkalosis does what to K?
Decrease
What 6 things should be asked about birth history?
- Post conceptions weeks at birth
- Length of stay
- Respiratory support
- Cardiac Problems
- Nervous system problems
- Muscular problems
What is the ongoing rule for when it is safe to do surgery as outpatient?
60 weeks post conception
Unique concerns with children in the preop eval
- Birth History
- Congenital problems
- Developmental milestones
- Respiratory infections
- NPO status
What should you ask about respiratory infections?
- How long
- Temperature
- Appetite
- Activity
- Parent assessment
What is the 2/4/6/8 NPO rule?
- 2 hours clears
- 4 hours Breast milk
- 6 hours formula
- 8 hours solids
How does injury/pain effect NPO status?
Delays gastric emptying