pulse oximetry Flashcards
pulse oximeter
allows clinician the ability to continuously monitor the percent of oxygen saturation of hemoglobin
conditions that would lead to an inaccurate zero reading
caused by sluggish flow
vasoconstriction hypovolemic shock hypothermia severe hypotension cardiac failure weak pulse medications fear hypoperfusion
venous pulsations
can cause oximeter to detect readings in the vein instead of artery
conditions that would cause incorrect reading due to venous pulsations
probe taped too tightly
shivering
right sided heart failure
CPR compressions
conditions that would cause inaccurate high readings
anemia bright overhead lights carbon monoxide cigarette smoker cyanide poisoning dysfunction hemoglobin
SpO2
percentage of hemoglobin attached to oxygen as measured by pulse oximeter
SaO2
arterial oxyhemoglobin saturated measured by an arterial blood gas (with sample of blood)
AP
apical pulse
stethoscope at apex of heart
PP
peripheral pulse
recorded from arteries of distal portion of limbs
how does a pulse oximeter work
principle based on red and infrared light absorption
oxygen absorbs infrared light, allows red light to pass
deoxygenated absorbs red light, allows infrared to pass
CaO2
absolute amount of oxygen in person’s blood
requires blood sample
free oxygen and oxygen attached to Hb measured then added up
PaO2
amt of O2 in solution = 0.003 ml / (100 ml blood x mmHg) X partial pressure
normal range of SaO2
95-100%
normal range of PaO2
100 mmHg
normal range of CaO2
16-22 mL of oxygen/dL of blood
