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Exam 3 Questions Flashcards | StudBud
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Exam 3 Questions
Exam 3 Questions
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1
A patient in hemorrhagic shock is intubated. Volume control with TV 450 ml, FiO2 0.5. Why does SBP drop from 110-85?
Hypercarbia
Decrease in venous return
Atelectasis due to high FiO2 (absorption atelectasis)
Right mainstem intubation
2
Which of the abnormalities below explains a decreased LOC with an ABG pH 7.25, PaCO2 25, PaO2 62, HCO3- 15.
Morbid obesity
Chronic obstructive pulmonary disease
Gastroenteritis with vomiting
Diabetic ketoacidosis
3
Spontaneous respiration ceases after transection of the
brainstem at the caudal end of the medulla
brainstem above the pons
brainstem - in the middle of the pons
spinal cord at the level of the first thoracic segment
4
Injection of a drug that stimulates the carotid bodies would be expected to result in
a decrease in the pH of arterial blood
an increase in the PCO2 of arterial blood
an increase in the HCO3- concentration of arterial blood
a decrease in the PCO2 of arterial blood
5
The main respiratory control neurons:
Send out regular bursts of impulses to expiratory muscles during eupnea
Are unaffected by stimulation of pain receptors
Send out regular bursts of impulse to inspiratory muscles during eupnea
Are located in the pons
6
In addition to rapid, shallow breathing, which of the following applies to pulmonary edema with alveolar filling?
Lung compliance is increased
Arterial hypoxemia cannot be abolished by inspiring 100%O2
Airway resistance is unaffected
Alveolar edema causes chest pain
7
In comparing uncompensated respiratory acidosis (URA) and uncompensated metabolic acidosis (UMA), which is true?
URA involves changes in plasma [HCO3-]; [HCO3-] is unchanged in UMA
There are no compensation mechanisms for metabolic acidosis
URA is associated with a change in PCO2; in UMA PCO2 is constant
Plasma pH change is always greater in URA compared to UMA
8
The decrease in O2 affinity of hemoglobin when the pH of blood falls is the
Bohr effect
Chloride shift
Haldane effect
9
Intravenous lactic acid increases ventilation. The receptors responsible for this effect are located in the:
medulla oblongata
carotid bodies
CSF
lung parenchyma
10
The arterial hypoxemia of a patient with diffuse interstitial pulmonary fibrosis (select 2 answers)
Is usually associated with CO3 retention
Is associated with a large increase in diffusing capacity during exercise
Typically worsens with exercise
Is due to diffusion impairment
11
Due to the Haldane effect, the high PO2 in the lungs causes ___ of the carbon dioxide Hb dissociation curve.
a left shift
a sigmoid shape
a right shift
12
Oxygen is normally transported in the blood directly combined with:
a globin chain
a ferric atom
a ferrous atom
plasma proteins
13
Which result below is expected for a 30pack-year smoker with FEV1 59%, FEV1/FVC ratio 0.62, & CXR shows large volumes?
Decreased RV/TLC ratio
Decreased FRC
Increased RV
Increased diffusing capacity for CO
14
Which of the following shifts the O2-Hb dissociation curve to the left?
anemia
ketoacidosis
hypoventilation
carbon monoxide
