Learn more about Cardio Pulmonary Equipment – Pulmolink
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Learn more about Cardio Pulmonary Equipment

What is CPX or CPET?

CPX, or to use its more correct abbreviation, CPET stands for Cardio Pulmonary Exercise Test.

What does a Cardio Pulmonary Exercise Test (CPET) involve?

It is a means of assessing the fitness of a subject or patient by exercising them in a controlled and quantifiable manner whilst gathering data.

This embraces gas analysis, ventilation and cardiac function to assess the gas exchange and circulation of a subject to a given workload.

The CPET brings together the functions of the respiratory, cardiac and circulatory systems in a complete diagnostic test. No other single test system provides such comprehensive information.

What is Cardio Pulmonary Exercise Test (CPX/CPET) Equipment?

Typically a CPET (CPX) test system comprises a trolley-mounted, computer-controlled 12 lead ECG module plus a gas analysis unit that measures the oxygen uptake and the carbon dioxide production of a patient by sampling their breathing whilst they exercise.

Non-invasive blood pressure and oxygen saturation is also recorded, usually by an integrated patient monitoring module.

The exercise is preferably performed on a static bicycle (Ergometer) although a Treadmill or Arm Ergometer (Handcrank) can also be used. These are connected to and controlled by the CPET system & its operator.

Why does the Ergometer or treadmill need to be controlled?

Initially, the subject should be observed at rest, or pedalling with unloaded work, to obtain a baseline condition, without hyperventilation or hypoventilation as a result of anxiety or stress.

Once this is achieved, a load or “ramp” needs to be applied progressively in a controlled manner, so that the subject has to work harder as the test progresses to achieve a peak
performance in 10 – 12 minutes.

This load or “ramp” needs to be set after prior discussion with the subject to understand their normal state of fitness and then a computer controlled protocol for the ergometer can be selected that will achieve the desired effect.

This control allows for quantifiable and reproducible results.

How is the test performed?

The patient is either fitted with a very lightweight facemask or a noseclip and mouthpiece is used.

Attached to this is a lightweight flow sensor, to measure inspired oxygen & exhaled carbon dioxide.

Once they are comfortable, they begin either cycling on the Ergometer or walking on the Treadmill and the data collection begins.

Once the baseline has been established, the load is increased to make the patient progressively work harder.