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NBME 22 Answers

nbme22/Block 1/Question#9

A 54-year-old man has an aneurysm in the distal ...

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submitted by keycompany(104),

Flow Rate = Velocity x Cross-Sectional Area

2 cm^2 x 20 cm/sec x 60 sec/min x 1 L/1,000 cm^3 = 2.4 L/min

1,000 cm^3 = 1 L

seagull  Well, I missed this one. I don't even feel bad. +7  
link981  @keycompany a small typo, 100 cm^3 = 1 L not 1000cm^3. 1000 mL^3= 1 L +  
hello  @keycompany how did you edit your original comment to fix your typo? +  




 +2  upvote downvote
submitted by nwinkelmann(57),

I've never been good at converting units :( lol so had to ask my brother. He told me that distance x distance = distance^2 = area, and distance x distance x distance = distance^2 x distance = distance^3 = volume. Gotta love public school for never been taught that... geesh (obviously I've done the equations and stuff, just never been told it that way/that simple before). Knowing that makes figuring out the equation much easier.

Flow rate = velocity x CSA = 20 cm/sec * 2cm^2 = 40cm^3/sec. To convert to L/min, just multiply: 40cm^3/sec X 60 sec/min X 1L/100cm^3 = 240 L/100 min = 2.4 L/min

Hope this helped!

impostersyndromel1000  to all my public school peeps out there (and not the nice public schools in rich areas, the real public schools)... we made it! +  




 +0  upvote downvote
submitted by kernicterusthefrog(17),

Just in case that lovely little equation provided by @keycompany wasn't quite enough for you, here's a link to a more complete explanation by Kahn Academy. Helped me, when I looked at the equation and said, whaaaa?