Oximetry BT_SQ 1.6

This LO is massive, and covers essentially an entire textbook. For this reason we will return to it frequently.

BT_SQ 1.6  Describe the methods of measurement applicable to anaesthesia, including clinical utility, complications and sources of error in particular:

· SI units

· Measurement of volumes, flows, and pressures, including transducers.

· Measurement of blood pressure

· Measurement of cardiac output

· Measurement of temperature

· Oximetry

· Gas analysis, including capnography

· Methods used to measure respiratory function, including:

– Forced expiratory volume

–  Peak expiratory flow rate

–  Vital capacity

–  Flow-volume loops

–  Functional residual capacity and residual volume

TRUE/FALSE A pulse oximeter radiating 2 wavelengths of light can only differentiate 2 different forms of Hb.

TRUE/FALSE Oxygenated haemoglobin absorbs light at a wavelength of 660nm.

TRUE/FALSE The y axis on the plethysmograph is an estimate of arterial calibre and thus sympathetic tone.

TRUE/FALSE Methaemoglobin is strongly absorbed at 660 and 940nm

TRUE/FALSE An adult pulse oximeter cannot accurately read oxygen saturations when foetal haemoglobin is present.

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