You are monitoring blood pressure during mechanical ventilation of a patient with pneumonia. A temporary increase in blood pressure occurs when the patient coughs. This temporary spike in blood pressure represents what type of variability?
a. Artifact
b. Factitious event
c. Physiologic variation
d. Instrument drift
ANS: C
The signal itself can exhibit a random variability related to the inherent imprecision of the signal or due to normal physiologic variability in the patient. Blood pressure, for example, changes within a certain range for many reasons.
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