Pulmonary CCRN study Questions and Correct Answers | Latest Update
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Course
Pulmonary CCRN
Institution
Pulmonary CCRN
A patient presents with labored breathing and an RR of 40 beats per minute (bpm). The
following ABG is obtained:
PaO2 68
PaCO2 50
pH 7.34
SaO2 91%
HCO3 22
Which of the following is the most accurate interpretation of the above situation?
A. Normal ABG for COPD patient
B. Respiratory fai...
Pulmonary CCRN study Questions and
Correct Answers | Latest Update
A patient presents with labored breathing and an RR of 40 beats per minute (bpm). The
following ABG is obtained:
PaO2 68
PaCO2 50
pH 7.34
SaO2 91%
HCO3 22
Which of the following is the most accurate interpretation of the above situation?
A. Normal ABG for COPD patient
B. Respiratory failure due to metabolic acidosis
C. Obstructive upper airway most likely causing respiratory failure
D. Respiratory failure due to dead space
✓ -:- D
Normally, as the minute ventilation (MV) increases, the PaCO2 should decrease. The
normal pattern is an inverse relationship. In dead space, the alveolar ventilation decreases
even as the respiratory rate increases. This results in an increase in CO2 and an abnormal
relationship between MV and PaCO2. The patient has respiratory acidosis, not metabolic
An obstructive airway disease causes a decrease in FEV1 with a relatively normal FVC
resulting in a decrease in the FEV1/FVC ratio. A normal ratio is 75% to 80%. The lower the
ratio, the greater the obstruction of airflow. This test is used to assess asthma patients
during bronchodilator treatments. A normal FEV1/FVC ratio would indicate a restrictive
airway disease.
A patient in the ICU is diagnosed with ARDS. The following are the ventilator settings and
ABG results:
SIMV 550 mL TV, Rate 16, 40%, PEEP 5
7.46 pH
48 PaCO2
82 PaO2
94% SaO2
What is the calculated PaO2/FiO2 ratio?
A. 120
B. 20
3|P a g e | G r a d e A + | 2 0 2 0 2 5
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