Esophageal Doppler Monitor

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Placed by Respiratory therapists much like a Naso-gastric tube

Principles:

• Ultrasound technology used to give real time information about the left ventricular flow based on waveform analysis of descending aortic pulse.

Direct flow measurement

• Corrected Flow Time (FTc):
  • Indicates left ventricular preload
  • Normal range is 0.330 – 0.360 seconds
• Peak Velocity (PV):
  • Used as an index to assess contractility
  • Age dependent normal values
• Stroke Distance (SD)
• Minute distance (MD)
• Mean Acceleration (MA)

Calculated measurements:

• Cardiac output (CO)
• Stroke volume (SV)
• Cardiac Index (CI)
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