Flow Measurement

Suggested Level of Knowlege: Good


BT_SQ 1.5 Describe basic physics applicable to anaesthesia in particular:

· Behaviour of fluids (gases and liquids)

· Electrical concepts, current, potential difference, resistance, impedance, inductance and capacitance

· Principles of humidification and use of humidifiers

· Principles of ultrasound imaging and use of doppler

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

Past SAQs

2012.1, 2002.1 Outline the principles of a pneumotachograph. What factors affect the accuracy of this device?

2011.1, 2006.2  Explain  the  difference  between  viscosity  and  density.  Outline  the  effects  of  changes  in  viscosity and density on the flow of gases and liquids.

2004.1 Briefly describe the difference between laminar and turbulent flow. List the factors that increase the probability of turbulent flow.

Blog Posts

Feb 21 2017




Draeger Flow Sensor. Note the two very fine wires running between the two pairs of prongs.