Mod IV: Pediatric Cardiac Output - Vital Signs Flashcards
Pediatric Cardiac Output
The pediatric heart is noncompliant an has poorly developed LV. This places a limiting factor on their “Frank-starling” response. Because of this, what would happen if a bigger strecth is applied to the LV?
It will not necessarily yield a bigger squeeze
Pediatric Cardiac Output
The pediatric heart is noncompliant and has poorly developed LV. “Frank-starling” response limited. How does this affect SV?
SV is limited
This means that the more you stretch the LV doesn’t necessarily equate to a bigger output
So if you think about CO as (SV x HR), SV will not be a factor that affect CO in the pediatric population
Instead the pediatric CO is very HR-dependent
Pediatric Cardiac Output
What is a critical determinant of pediatric CO?
(HR)
CO = SV x HR
Pediatric Cardiac Output
Why does vagal tone predominates in pediatrics predisposing them to bradycardia?
Pediatric PNS is fully developed
Whereas pediatric SNS is not fully developped
- This is somewhat of a double-edge sword, because we just said that their CO is predominantly dependent on HR, so the higher the HR, the better their CO*
- However, they are also predisposed to having vagal responses and to having bradycardia*
Pediatric Cardiac Output
T/F: Pediatrics are also Prone to CHF (neg. chronotropy)
True …
Pediatric Cardiac Output
T/F: Pediatrics are Sensitive to myocardial depression
True …
Pediatric Cardiac Output
What’s responsible for Hypotension without tachycardia in peds?
Immature baroreceptor reflexes
So they have Hallmark hypovolemia that manifest as Hypotension without tachycardia
Pediatric Cardiac Output
Why do Pediatrics have an increase in their CO (2-3X’s adult)?
Higher metabolic O2 consumption/demand
Pediatric Cardiac Output
What are normal Cardiac Output values for Pediatrics?
CO = 200-325 mL/kg/min
Pediatric Cardiac Output
What’s the normal pediatric O2 consumption?
6-9 mL/kg/min
Pediatric Cardiac Output
What’s the normal adult O2 consumption?
3-4 mL/kg/min
Pediatric Vital Signs
T/F: HR & BP vary with age
True
Pediatric Vital Signs
For children 1-10 y/o, how is typical SBP calculated?
SBP = 90 + (child’s age in yrs. x 2) mmHg
Pediatric Vital Signs
For children 1-10 y/o, how is Lower limits of SBP calculated?
Lower limits of SBP = 70 + (child’s age in yrs. X 2) mmHg
Pediatric Vital Signs
T/F: Maintain SBP at age-appropriate levels when under anesthesia
True