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CFRN Exam Questions Set| 600+ Questions with 100% Verified Answers
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CFRN Exam Questions Set| 600+ Questions with 100% Verified Answers
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CFRN Exam Questions Set| 600+ Questionswith 100% Verified Answers
What is Graham's gas law? - ✔✔Gases diffuse from a region of higher concentration
(pressure) to lower concentration (pressure) until equilibrium is reached.
A patient is at sea level (760 mmHg) and is on 30% O2 (FiO2 of 0.3). What is their partial
pressure of oxygen at this altitude? - ✔✔228 (760 x 0.3)
Flicker Vertigo is primarily caused by what? - ✔✔Sunlight passing through the rotors (lower
spinning 5-20Hz - can cause vertigo and seizure activity)
For every decrease below sea level (going below water) of ___ feet is equal to additional ATM -
✔✔33
(ex: 99 feet below water is 4 ATMs - using 1 ATM as your "zero")
Quick way to estimate patients PaO2 using FiO2? - ✔✔FiO2 x 5
Bedside calculation to estimate PaO2? - ✔✔(700 torr x FiO2) - 50
ex: (700 x .5) - 50. (*700 = estimated atmospheric pressure, .5 for FiO2 of 50%)
You compare your bedside calculation estimate of PaO2 to an actual ABG and notice a large
disparity, what physiological process is likely occuring? - ✔✔Shunt physiology (alveoli are
perfused with blood as normal, but ventilation/oxygenation fails to supply the perfused region)
What does the DEATH acronym stand for in regards to stressors of flight? - ✔✔Drugs,
Exhaustion, Alcohol, Tobacco, Hypoglycemia
,A period of time from the onset of a decompression until a person is unable to effectively or
adequately perform duties due to an insufficient supply of oxygen. - ✔✔Time of useful
consciousness
T/F: In an explosive decompression above 40,000 feet time of useful consciousness will be less
than 10 seconds. - ✔✔True (*test tip pick shortest amount of time answer*)
T/F: The altimeter setting is your barometric pressure. - ✔✔True
Desired FiO2 based on altitude formula? - ✔✔(FiO2 x P1) / P2
*P1 is current barometric pressure
*P2 is barometric pressure at highest flight altitude
(to maintain same level of oxygen therapy at a higher altitude)
PaO2 will decrease by ____________ mmHg for every _____________ feet increase in altitude.
- ✔✔5/1000
If the atmospheric pressure at 18,000 ft. MSL is 380 torr, what would the partial pressure of
oxygen at that altitude? - ✔✔79 torr (380 x 0.21)
A patient suffering from decompression sickness is an example of which gas law? -
✔✔Henry's
When administering high concentrations of oxygen to alleviate hypoxic hypoxia, you are
altering which component of which gas law? - ✔✔Henry's (and the solubility of oxygen
diffusion into the solution - blood)
The inability of getting oxygen molecules down through airways, through alveolar membrane,
and onto a red blood cell, ultimately attaching to a hemoglobin molecule. - ✔✔Venous
admixture or V/Q mismatch (Q stands for cardiac output/flow)
,Patients with a VQ mismatch, at least early on, will often have what type of ABG? -
✔✔uncompensated respiratory alkalosis, PaO2 hypoxemia (patients tachypneic leading to
the respiratory alkalosis)
dead space ventilation (V/Q mismatch) - ✔✔the volume of air inhaled that does not take
part in gas exchange because the alveoli are not perfused/poorly perfused
(the Q or flow/cardiac output portion of V/Q mismatch)
Acute exacerbation in COPD and Asthma leads to ventilatory failure by failure to ___, therefore
leading to air ___ and less volume being able to be moved throughout the lungs. -
✔✔exhale, trapping
T/F: Chronic COPD patients tend to be hypercarbic and hypoxemic on ABGs. - ✔✔True (think
50:50 club - PaCO2 >50, PaO2 <50)
ATP is a product of what type of metabolism? - ✔✔Aerobic
For ATP production, the ____ nervous system stimulates ___ 2 receptors, which then cause
glycolosis to create more ATP. - ✔✔sympathetic, beta
Lack of ___ or O2 causes an alteration of ATP production, and the byproduct is ____ acid. -
✔✔glucose, lactic
T/F: Aerobic metabolism requires oxygen - ✔✔True
Glycogen is converted to _____ during glycogenesis. - ✔✔glucose
___________ is the starting molecule for glycolysis - ✔✔Glycogen
, How many ATP are produced per 1 molecule of glucose during glycolysis process? - ✔✔2
The krebs cycle purpose is multifaceted:
1) Carry ___ ions into the electronic transport chain (via niacin and riboflavin bonds)
2) Forms ___ during cellular respiration (as a byproduct of niacin/riboflavin gaining hydrogen
ion)
3) Form ___ more additional ATP - ✔✔hydrogen, CO2, 2
What B vitamins strongly facilitate the krebs cycle? - ✔✔Niacin and Riboflavin
When Niacin and Riboflavin, bonded with _____ ions after the krebs cycle, move into the
electron tranpsport chain (or oxidative phosphorylation), the hydrogen ions pick up ____
molecules (oxidation) and become ____. - ✔✔hydrogen, oxygen, H2O
What does ADP stand for? - ✔✔adenosine diphosphate
What does ATP stand for? - ✔✔adenosine triphosphate
During phosphorylation, ADP gains one more ____ bond, creating ____. - ✔✔phosphorous,
ATP
(the 3rd phosphorous bond is what the cell pulls off for energy source)
During oxidate phosphorylation, how many net ATP are produced? - ✔✔36 (gross 38 but 2
are used during krebs cycle to power it)
T/F: both aerobic and anaerobic metabolism start with glycolysis - ✔✔true
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