A patient arrives in the emergency department via ambulance following rescue from a house fire. The instrument that would be most appropriate to assist the respiratory therapist in assessing this patient's oxygenation status is which of the following?
a. Capnograph
b. Pulse oximeter
c. Calorimeter
d. CO-oximeter
Q. 2 Pulse oximetry is most useful in which of the following situations?
a. Determining when to extubate an adult
b. Prescribing oxygen therapy for neonates
c. Monitoring patients undergoing chest physical therapy
d. Establishing initial oxygen necessity for home care patients
Q. 3 During which phase of a capnograph does alveolar gas containing carbon dioxide (CO2) mix with gas from the anatomical airways and the CO2 concentration rises?
a. Phase 1
b. Phase 2
c. Phase 3
d. Phase 4
Q. 4 An arterial blood gas should be done to confirm pulse oximetry findings less than a minimum of _____________.
a. 60
b. 70
c. 80
d. 90
Q. 5 A pulse oximeter differentiates oxyhemoglobin from deoxygenated hemoglobin by which of the following methods?
a. Relating cyclical changes in light transmis-sion through the sampling site.
b. Shining and comparing two wavelengths of light through the sampling site.
c. Direct measurement by a heated polaro-graphic electrode applied to the skin.
d. Using a color sensing device that absorbs one wavelength of light through the skin.
Q. 6 The term used to specify the flow, pressure, and volume waveforms that are graphed relative to time is called:
a. hysteresis.
b. loop.
c. waveform.
d. scalar.
Q. 7 A pulse oximeter reading will be most accurate when used with a patient in which of the follow-ing situations?
a. An intensive care unit patient with hyper-bilirubinemia
b. A hypotensive patient receiving peripheral vasoconstrictors
c. An emergency department patient with evidence of smoke inhalation
d. An open heart patient receiving extracor-poreal membrane oxygenation
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