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Math Problems
Chemistry & Physics/CRNA/Have calculator handy!
| Question | Answer |
|---|---|
| Example: If the atmospheric pressure on a mountain is 550mmHg, what is the partial pressure of oxygen? | Concentration of Oxygen of room air = 21% Atm pressure on mountain = 550mmHg=total pressure 21%x550mmHg=115.5 mmHg for O2 |
| Example: What are the partial pressures of N2O and O2 if they are delivered to a patient in a 70%/30% N2O/O2 mixture? What law explains this? | Dalton's law of partial pressures. Total pressure= 760mmHg atmospheric pressure Concentration N2O=70% Concentration O2= 30% Partial pressure of N2O= 70%x760mmHg=532mmHg Partial pressure of O2=30%x760mmHg= 228mmHg |
| Problem, if the flow of O2 from an E-size cylinder is 5L/min, how long will it take a full O2 cylinder to empty? | Pressure of O2 in E cylinder=2200 psi Volume of gas/O2 in a full E cylinder=660L (660L)/(5L/min)=132min, or about 2 hours. |
| Problem if the pressure in an O2 E cylinder is 1,100 psi and the flow is 5L/min, how long will it take the cylinder to finish emptying? | Tank is half full, 2200psi/2=1100 and 660L/2=330 5L/min x 330/time=66min or just over 1 hour |
| What is the vapor pressure of Enflurane at 20C? What is the Minimal Alveolar Concentration of that gas (MAC)? | Enflurane = 175 mmHg MAC=1.68% |
| What is the vapor pressure of Halothane at 20C? What is the MAC? | Halothane=243 mmHg MAC=0.75% |
| What is the Vapor pressure at 20C of Isoflurane? MAC? | Isoflurane=239 mmHg MAC=1.15% |
| What is the Vapor pressure at 20C of Sevoflurane? MAC? | Sevolflurane= 170 mmHg MAC=2.1% |
| What is the Vapor pressure at 20C of Desflurane? MAC? | Desflurane=669 mmHg MAC=6.0% |
| What is MAC? | the Minimal Alveolar Concentration |
| The Minimal Alveolar Concentration is ? | 1 MAC=the minimal alveolar concentration of an inhalation agent at which 50% of the patients will not respond to surgical stimulation. |
| What is the minimum standard O2 concentration patients can receive during anesthesia? | 30% O2 |
| Problem: If Isoflurane is added to a flask of oxygen, what is the % oxygen and % isoflurane in the flask above the liquid? | Vapor pressure is 239 mmHg, Partial pressure of after Isoflurane is added = (760-239 mmHg)=521 mmHg %O2=521/760 x100 = 68.6% |
| Problem: If enflurane is added to a flask of oxygen, what is the % enflurane and the % oxygen in the flask above the liquid? | 760mmHg-175mmHg= 585 mmHg oxygen 175/760=.230 x 100=23% Enflurane 585/760=.769 x 100=76.9 % Oxygen |
| Problem: If desflurane is added to a flask of oxygen, what is the % desflurane and the % oxygen in the flask above the liquid? | PP of desflurane=669mmHg 669/760=.88 x 100= 88%= desflurane 760-669= 91mmHg O2 91/760=.119 x 100= 12%=oxygen |
| What are the dimensions of an E cylinder of Oxygen? | Dimensions: 2 feet long and 4 inches in diameter |
| When do you need to replace your Oxygen E cylinder? At what pressure? | 200 psi |
| What are the dimensions of an H cylinder of Oxygen? | Dimensions: 4 feet long and 9 inches in diameter |
| What is the purpose of the E cylinder? | Most often used for portable oxygen sources for transport. |
| What is the purpose of the H cylinder? | Sources of gas for small or infrequently used pipeline "gas-bank" systems |
| what is the pressure in a full E cylinder of oxygen, how much volume is in a full E cylinder? | 2200 psi. 660L |
| If your E cylinder of oxygen is 2/3 full how much oxygen do you have left? | 660Lx2/3=440L |
| How much volume is in a full H cylinder? | 6900L Still at 2200 psi for oxygen in H tank |
| What color is an oxygen tank? | Green |
| What color is a CO2 tank? | Gray |
| What color is a N2O tank? | Blue |
| What color is a cyclopropane tank? | orange |
| what color is a helium tank? | Brown |
| What color is nitrogen? | Black |
| What color is medical air? | Yellow |
| if the flow of o2 from an e-size tank is 5 L per minute, the tank will last | 2 hr/ 660/5=132min/2hr |
| full e tank stats | service capacity=1900psi volume of o2=660 2200psi evolves 660 half full 1100 psi evolves 330 |
| with a 6 liter/min flow and a mixture of 70% n2o and 30% o2 what is the flow of n2o/min | 4.2L |
| when the pressure gauge on a n2o tank begins to fall rapidly the | the tank no longer carries n2o liquid form |
| what volume will 2 moles of gas occupy at standard temp (0 degree C) and 1 atm. whose law | 1 mole = 22.444.8 l, avogadro |
| what is the partial pressure of a gas if it s concentration is 5% | 760 x .05 = 3838mm hg |
| when halothane is added to a flask containing 100% o2 the new concentration of o2 will be | 68% |
| what is partial pressure of isoflurane when the concentration delivered to the pt is 1.5% | 11.4 760x1.5=1140 1140/100=11.4 |
| the partial pressure of O2 at 1atm is | 159mm hg |
| if halothane is added to a flask sitting on a lab bench containing 100% O2, what will be the resulting pp of O2 in the gas above the halothane liquid | 760-243=517 |
| the partial pressure of O2 in the arterial blood increases from 100 to 600mm hg, the amount of dissolved O2 increases by how much | 1.5ml o2/100ml blood |
| if map is 100mm hg, cvp is 10mm hg, and cO is 4.5 l/min, the resistance to flow thru the svr in dynes cm-5sec is | 1600/ svr=80x(100-10)/4.5 |
Created by:
honeybeeforeman
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