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how to interpret a spirometer trace

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by

J Lee

on 17 March 2013

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Transcript of how to interpret a spirometer trace

By Jia Ping and Sarah How to interpret a spirometer trace AN INTRO INTO BREATHING ANSWERS TO THE PAST PAPER QUESTION Breathing in and out is second nature to us. To be able to measure factors of breathing would give us an insight into how our body functions to provide oxygen.
For example, breathing in and out at each breath is our TIDAL VOLUME which is approximately 0.5dm3
During exercise, our breathing rate increases and how much we need to breathe too.
The maximum volume of air we are able to inhale and exhale is the VITAL CAPACITY of our body.
To measure our lung volumes, we use a spirometer. A spirometer is a medical instrument used to measure lung volume and used to determine person's rate of oxygen consumption.
Above is an image of a wet spirometer as a person would breathe in and out and it would produce a trace from using an ink pen and a float (in water)
One would breathe in through a mouthpiece which is connected to the air tank via breathing tubes.
Returning air would travel through the soda lime canister which absorbs carbon dioxide in exhaled air and make it easier to determine the amount of oxygen inhaled. What is a spirometer? HOW DO YOU CALCULATE LUNG VOLUMES FROM INTERPRETING A SPIROMETER TRACE? 1) When exercise begins, both ventilation and heart rate increases. This supplies more oxygen to muscles.

i) Describe how breathing rate and tidal volume can be determined from a spirometer trace. (3 marks)

ii) Explain how you would use breathing rate and tidal volume to calculate ventilation rate (1 mark) PAST PAPER QUESTION ON SPIROMETER TRACES 1ai) breath identified; reference to time (for one/several peaks); reference to method for tidal volume, eg. height from peak to trough on trace; reference to calibration for volume

ii) breathing rate x tidal volume A spirometer is initially calibrated with a known volume of oxygen in the air tank with the chart recorder marking a value before and after oxygen is added.
Breathing in means the air tank lid deflates and the pen on the kymograph traces downwards.
Breathing out means the air tank lid inflates and the pen on the kymograph traces upwards.
The speed of the tracer can be set so you can determine the relationship between speed and time.
The breathing rate is calculate by how many breaths in a minute.
The volume of air breathed in and out is determined by the vertical movements on the trace.
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