Cardiothoracic & vascular anesthesia
Assessment of Renal Vein Flow Index by Transesophageal Echocardiography: Precision, Variability, and Association with Cardiac Index During Cardiac Surgery
Authors' conclusion
Intraoperative measurement of RVFI by TEE has excellent precision. TEE can detect a clinically meaningful change in RVFI. RVFI varied over the course of surgery and was associated with CI, consistent with expectations for a physiological measure of renal blood flow.
Study context
- Population
- Patients undergoing cardiac surgery at a university hospital324 renal vein flow index (RVFI) measurements
- Participants
- 10 patients
- Outcome
- RVFI precision, variability and association with CI
Methodological detailsRVFI measured by transesophageal echocardiography (TEE) every 30 minutes throughout surgery, Data from 108 ultrasound images
- RVFI measured by TEE every 30 minutes throughout surgery
- Data from 108 ultrasound images
Main finding
As reported in the abstract
Estimated measurement error, units (below clinically meaningful threshold of 0.1 units)
0.030
Intraclass correlation coefficient (within 3 consecutive cardiac cycles)
0.99
RVFI range across surgery, units
0-1.0
Decrease in RVFI per CI increase of 0.5 L/min/m²
0.058
95% CI 0.04–0.08p < 0.001
Observational data: associations, not effects.
Parts of this Brief are withheld: the automatic checks could not confirm them against the abstract.
Original publication
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