NBME 24 Answers ↦
seagull
i'm pretty sure your a prof and not a student.
+15
2019-06-07T04:53:09Z
nor16
nevertheless, we are greatful for explanation!
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2019-07-29T19:03:56Z
niboonsh
I remember seeing a question describe parasternal lift in the context of pulm htn. still got this wrong tho fml
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2019-09-13T22:03:43Z
anotherstudent
Did my question have a typo? It says O2 saturation in the right ventricle is 70, which is equal to the Right atrium and vena cava. It says the O2 saturation in the left ventricle is 82%, which is a decrease from the LA (95) but not equal to the RV, which is why I thought there wasn't a VSD, I assumed there was a weird shunt from the LV to some other part. Will O2 saturation not always equalize?
+1
2020-03-21T17:10:47Z
pseudomonalisa
This is a right to left VSD due to the pulmonic stenosis present in Tetralogy of Fallot. O2 sat will be low (70) in the right ventricle, and from there it'll enter the left ventricle and mix with freshly oxygenated blood coming from the left atrium (95). Because of the mixing, the O2 sat of blood in the left ventricle will be somewhere in the middle of 70 and 95 (82 in this case). You're correct, though, that most other VSDs are left to right and you'd see greater O2 sat in the right ventricle in that case (not sure if it equalizes with the left ventricle though).
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2020-03-25T01:48:52Z
thotcandy
classic eisenmenger syndrome
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2020-02-13T07:05:36Z
peqmd
Not necessarily. Squatting just helps to increase preload => this will expand the left cardiac chambers and reduce R->L shift. It's a general principle to R->L shunt heart defects not specific to one disease
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2020-02-29T03:23:28Z
submitted by lsmarshall(393), 2019-05-29T01:32:35Z
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