TYK190: Difference between revisions
No edit summary |
m Text replacement - "<p style="text-align: center;"> About Test Your Knowledge</p>" to "<p style="text-align: center;"> About Test Your Knowledge</p> Category:TYK" |
||
| (One intermediate revision by the same user not shown) | |||
| Line 43: | Line 43: | ||
<p style="text-align: center;">[[TYK189|<Prev Question]] --- [[TYK191|Next Question>]]</p> | <p style="text-align: center;">[[TYK189|<Prev Question]] --- [[TYK191|Next Question>]]</p> | ||
<p style="text-align: center;">[[TYK About | About Test Your Knowledge]]</p> | <p style="text-align: center;">[[TYK About | About Test Your Knowledge]]</p> | ||
[[Category:TYK]] | |||
Latest revision as of 02:37, 25 September 2026
Which of the following reflects the relationship between flow, resistance, and pressure with regards to shunts in both the fetal and adult circulations?
a) flow = pressure gradient x resistance
b) pressure gradient = flow x resistance
c) resistance = flow / pressure gradient
d) resistance = (pressure gradient)2 / flow
e) Qp = Qs x resistance
Answer
Answer b.
This equation, which may be thought of as an extrapolation of Ohm’s law (Voltage = Current x Resistance), represents the determinants of flow direction and quantity through a shunt. Rearranged as: Flow = Pressure Gradient / Resistance, it becomes clear that for circulation in parallel (as with shunted intracardiac flow), decreasing resistance in one limb of the circuit (i.e., pulmonary vascular resistance) will increase flow to that limb and decrease flow to the other.
Notes
- This question originally printed in the Pediatric Anesthesiology Review Topics kindle book series, and appears courtesy of Naerthwyn Press, LLC.
Keywords