Pulse Oximetry

Lesson on pulse oximetry, monotoring blood oxygen saturations with implications for clinical practice.
Haemoglobin is found in
a. the white blood cells
b. the red blood cells
c. in the plasma, bound to plasma proteins
d. in the interstitial spaces

SpO2 levels will be highest in the;
a. Inferior vena cava
b. right ventricle
c. pulmonary arteries
d. pulmonary veins.

High levels of oxygen, greater than 98% saturations, in the systemic blood can lead to
a. increased production of lactic acid
b. a cyanotic discolouration of the skin
c. localised vasodilation
d. localised vasoconstriction.

Which of the following absorbs red light infra-red light at the same frequencies as oxyhaemoglobin?
a. arterial vessel walls
b. cyanide
c. deoxyhaemoglobin
d. carboxyhaemoglobin