Oesophageal Doppler monitoring during major surgery provides which haemodynamic variable that guides fluid optimisation?
- A Central venous pressure (CVP) waveform
- B Pulmonary artery wedge pressure directly
- C Stroke volume variation (SVV) and corrected flow time (FTc) guiding fluid responsiveness ✓
- D Systemic vascular resistance only
Explanation
Oesophageal Doppler (ODM) measures aortic blood flow velocity and derived variables: peak velocity (PV), mean acceleration, stroke volume (SV), and corrected flow time (FTc = systolic flow time corrected for heart rate, normal 330–360 ms). A short FTc (<0.35 s) indicates hypovolaemia; FTc improves with fluid bolus. Stroke volume variation (SVV) >12–15% on volume-controlled ventilation suggests fluid responsiveness. ODM-guided haemodynamic optimisation (goal-directed therapy) reduces complications and length of hospital stay in high-risk surgical patients. It is less invasive than PAC and more dynamic than CVP.
Reference: Morgan & Mikhail's Clinical Anesthesiology, 6th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.