and Correct Answers | New
Update
What is Poiseuille's Law? - ANSWER ✔✔relates the resistance of a
gas flowing through a tube, to its length, the viscosity of the gas and the
radius of the tube.
A small decrease in airway radius results in huge increase to the
resistance of gas flow.
What factors are involved in Poiseuilles law? - ANSWER ✔✔Radius
of airway
Resistance of gas
,Length of airway
Viscosity of gas
Whats the difference in larynx position in the young child? - ANSWER
✔✔It lies higher in the neck
What is choanal atresia? - ANSWER ✔✔Congenital obstruction of
posterior nasal passages
How does the epiglottis compare in children vx adults - ANSWER
✔✔Epiglottis is larger and floppier in infants
What is the air-alveolar surface area for gas exchange at birth? -
ANSWER ✔✔3 m2 compared to 70m2 in an adult
Minute ventilation - ANSWER ✔✔tidal volume x respiratory rate
What is the main determinant of CO2 removal? - ANSWER
✔✔minute ventilation
Tidal volume - ANSWER ✔✔the volume of gas with each breath
What is the tidal volume throughout life? - ANSWER ✔✔constant 4-
6ml/kg
,What does the diaphragm do during inspiration? - ANSWER
✔✔descends creating negative pressure which draws air into the upper
airways and lungs
What is the circulating volume of an newborn? - ANSWER
✔✔80ml/kg (60-70 in adults)
What determines oxygen delivery? - ANSWER ✔✔arterial oxygen
content and cardiac output
How does cardiac output relative to body weight compare in infants vs
adults - ANSWER ✔✔Cardiac output is higher in infancy (largely
achieved by higher HR)
Why is bradycardia important in children - ANSWER ✔✔Cardiac
output is directly affected by HR
How to calculate MAP in acute conditions? - ANSWER ✔✔((2x
diastolic) + systolic) / 3 = MAP
How does MAP relate to cardiac output? - ANSWER ✔✔MAP = CO x
SVR
What formula can be used to estimate weight in a child 1-10 years? -
ANSWER ✔✔(age in years + 4) x 2
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, What causes grunting? - ANSWER ✔✔exhaling against a partially
closed glottis - it is an attempt to generate a positive end-expiratory
pressure that prevents airway collapse at the end of expiration
Do anaemia or jaundice affect pulse oximetry? - ANSWER ✔✔no
What are the 5 main categories of shock? - ANSWER
✔✔Hypovolaemic, distributive, cardiogenic, obstructive, dissociative
What are examples of distributive shock? - ANSWER ✔✔anaphylaxis
and sepsis - inadequate distribution of blood flow so that tissues have
inadequate supply
What are examples of obstructive shock? - ANSWER ✔✔cardiac
tamponade, tension pneumothorax, pulmonary embolism (obstruct blood
flow to/from the heart)
What are examples of dissociative shock? - ANSWER ✔✔anaemia,
carbon monoxide poisoning (where the oxygen carrying capacity of
blood is limited)
What is the equation for blood pressure? - ANSWER ✔✔BP = CO x
SVR
In hypovolaemia, what percentage of a child's circulating volume can be
lost before they develop hypotension? - ANSWER ✔✔40%