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Oesophageal Doppler Monitor (ODM)

Oesophageal Doppler Monitor (ODM)

A narrow disposable probe is passed down the oesophagus. It transmits and receives ultrasound signals and uses the Doppler principle to measure the speed of blood passing through the adjacent aorta. The probe is rotated until a good output waveform is displayed on the monitor. The waveform gives information on stroke volume, preload and afterload, however proper positioning must be ensured before any interpretation of the results, as small movement of the probe can radically alter the readings.


Ease of use

Minimally invasive

Complications and disadvantages

Not easy (but possible) to use in awake patients

Risk of oesophageal damage (small)

Unable to use – oesophageal tear, coarctation and aortic balloon pump

Readings depend on probe position

Further reading


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