(100% CORRECT ANSWERS) /ALREADY GRADED A+
“PaO2 - CORRECT ANSWER partial pressure of oxygen in arterial blood, obtained using
an ABG
80-100mmHG
PaO2 60=SpO2 90%"
"SpO2 - CORRECT ANSWER saturation of peripheral oxygen, obtained using pulse ox
90-100%
SpO2 90%=PaO2 60"
"PaCO2 - CORRECT ANSWER 35-45"
"respiratory acidosis - CORRECT ANSWER low pH, high CO2
causes: CNS depression from drugs such as sedation, injury, or disease
breathe too slow, retaining CO2"
"respiratory alkalosis - CORRECT ANSWER high pH, low CO2
causes: pain, fever, sepsis
breathe too fast, not retaining enough CO2"
"HCO3 - CORRECT ANSWER 22-26"
"metabolic acidosis - CORRECT ANSWER low pH, low HCO3
causes: diarrhea, DKA, hyperkalemia"
"metabolic alkalosis - CORRECT ANSWER high pH, high HCO3
causes: vomiting, suctioning, hypokalemia"
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,"minute ventilation - CORRECT ANSWER tidal volume x respiratory rate
volume inspired during 1 minute
normal is 5-8L/min"
"pressure support - CORRECT ANSWER -eases the work of breathing, helps to
overcome airway resistance of breathing through artificial airway
-cannot be used with AC or CMV
-CAN be used with SIMV
-Patient can take breaths between mandatory breaths
-used to wean from ventilator"
"peak airway pressure - CORRECT ANSWER highest pressure recorded at the end of
inspiration"
"SIMV - CORRECT ANSWER synchronized intermittent mandatory ventilation
mandatory breaths have a set tidal volume, pt initiated breaths have varying tidal volume
initial mode for ventilation or weaning mode
disadvantage: increased work of breathing and can lead to pt/vent asynchrony"
"AC/CMV - CORRECT ANSWER Assist control or continuous mandatory ventilation
pt initiated or ventilator control breaths have set tidal volume
disadvantages: hyperventilation which may cause respiratory alkalosis or hyperinflation,
less comfortable for pt"
"oxygenation - CORRECT ANSWER the process of delivering oxygen to the blood"
"diffusion - CORRECT ANSWER movement of gases between air spaces in lungs and
bloodstream"
"how do we know that ventilation and/or oxygenation is less than optimal in our pts? -
CORRECT ANSWER -respiratory assessment
-pulse oximetry
-ABGs
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, -imaging
-P/F ratio"
"perfusion - CORRECT ANSWER movement of blood in and out of capillary beds"
"P/F ratio - CORRECT ANSWER tells us the degree of sickness of our pt's lungs, and
helps assess oxygenation
PaO2/FiO2
normal is 300-500"
"ARDS - CORRECT ANSWER -hypoxemia within 7 days of pulmonary insult
-alveoli fill with fluid and may collapse
-bilateral opacities that isn't explained by pleural effusions, pneumothorax, or pulmonary
nodules
-respiratory failure not attributed to volume overload
-mild, moderate or severe P/F ratios in presence of PEEP"
"distinguish ARDS from CHF - CORRECT ANSWER check BNP and edema which may
indicate CHF is the cause
look at lung films and for a pulmonary insult within the last 7 days which may indicate
ARDS"
"ARDS severity - CORRECT ANSWER look at P/F ratio
mild: 200-300
moderate: 100-200
severe: <100"
"injury to alveoli - CORRECT ANSWER -causes release of proinflammatory cytokines
-cytokines recruit neutrophils to the lungs
-neutrophils become active and release toxic mediators
-damage to capillary endothelium and alveolar epithelium
-proteins leak out from vascular space
-normal oncotic gradient, fluid doesn't stay where it should. gets into airways and
interstitial spaces"
"ARDS s/s - CORRECT ANSWER -hypoxemia after pulmonary insult
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