| Author | 9 Posts |
epica
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An 18-year-old male is brought the emergency department after a motorcycle accident. On arrival, his vital signs are heart rate 130 beats/minute, blood pressure 70/40 mmHg, respiration rate 20/minute, and his oxygen saturation is 90% on 2 Liters of face mask oxygen. He is intubated and two large bore IVs are started. You remember that starting a short, large bore IV is ideal for delivering large amounts of IV fluids very quickly. What would happen to the resistance of the IV catheter if you had used a catheter twice as long with half the diameter?
A. Resistance would increase by a factor of 4
B. Resistance would increase by a factor of 8
C. Resistance would increase by a factor of 16
D. Resistance would increase by a factor of 32
E. Resistance would increase by a factor of 64
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| new_n_lost
Politically InCorrect
Topics: 653
Posts: 6,118
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B. Resistance would increase by a factor of 8
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| epica
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| doc179
Forum Guru
Topics: 67
Posts: 1,217
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D
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| donmako
Forum Newbie
Topics: 0
Posts: 6
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ans C
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| Luckyall
Forum Guru
Topics: 11
Posts: 593
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CCCCCCCCC bc the most imp factor determining R is the r  ---> (r/2) 4---> new R is 16R .
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| RayBerg
Forum Senior
Topics: 32
Posts: 150
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Me thinks its D
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| epica
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Ans is D
Poiseuille's law states that Resistance = 8nl/pr4 where l = length, r = radius and n = viscosity. If you double the length and decrease the radius by a factor of 2, resistance increases by a factor of 32. The other choices are incorrect
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| SILVER
DoWhatYou'veGotToDo
Topics: 21
Posts: 799
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There are questions, and then there are questions!  
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