Monitoring Oxygenation Flashcards
2 ways to measure oxygenation
pulse oximeter or blood gas
T/F: the colour of mucus membranes is a reliable method of measuring oxygenation
false, this is just an estimate and can’t be relied on alone
About ____ of the O2 in blood is dissolved in plasma, and this is proportional to _____.
2%, PaO2
____ of oxygen in the blood is bound to hemoglobin.
98%
A PaO2 < 60mmHg or SaO2 <90% indicate
hypoxemia
Which of the following is FALSE regarding pulse oximetry? A) continuous monitoring is possible B) non-invasive C) results affected by tissue thickness D) expensive
D - its cheap
What are the results of pulse oximetry affected by?
tissue thickness, hypo perfusion (vasoconstriction), anemia, pigmentation, movement, presence of abnormal Hb species (CO poisoning or methemoglobinemia)
T/F: If SpO2 = 100% and FiO2 = 1 and PaO2 <500mmHg, oxygenation is normal.
False!
3 important times to use pulse oximeter
patient breathing air
V/Q mismatch
respiratory disease
Normal PaCO2 is?
35-45mmHg
What is ventilation
the process involved in the movement of air in and out of the alveoli
PaCO2 > 45mmHg
hypercapnia or hypoventilation
PaCO2 < 35 mmHg
hypocapnia or hyperventilation
4 ways to assess RR
auscultate thorax
look for movement of thorax and abdomen
movement of breathing bag
read monitor (capnograph)
What is capnometry
measurement of CO2 partial pressure in the airway
4 factors that influence ETCO2 values
CO2 production
Circulation
alveolar ventilation
measurement error
4 phases of a capnogram
baseline (inspiration)
expiratory upstroke
alveolar plateau
inspiration begins
Which phase of the capnogram refers to the ETCO2?
D (top right corner)
T/F: Hyperthermia is more common than hypothermia
false, other way around
Which is FALSE regarding hypothermia? A) CV system may be depressed (bradycardia) B) may prolong recovery C) decreases MAC of anesthetics D) none of the above
all of these are true, the answer is D
T/F: hyperthermia may result in damage to the CNS
true!
The most biologically relevant measurement of body temperature is the ___
core body temperature
T/F: it is safe to increase the vaporizer to treat hyperthermia
false!! anesthetic depth should be determined without regard to body temp, you must cool the body
5 ways to know patient is alive
pulse auscultate heart beat doppler patient has a BP ET CO2 is normal
Which is the best anesthesia tool
your knowledge!
