Key result
Anaesthesia increased the LiDCO plus monitor calibration factor by a mean of 53%, while aortic clamping decreased it by a mean of 40% during aortic aneurysm repair.
Why the study?
Does anaesthesia and aortic clamping affect the calibration factor of arterial pulse power analysis for cardiac output measurement in patients undergoing elective abdominal aortic aneurysm surgery?
Observational (n=15)
Does anaesthesia and aortic clamping affect the calibration factor of arterial pulse power analysis for cardiac output measurement in patients undergoing elective abdominal aortic aneurysm surgery?
Recalibration of arterial pulse power analysis monitors is required after induction of anaesthesia and aortic clamping to ensure accurate absolute values of cardiac output and stroke volume.
Answers are grounded in this paper and cite their sources.
May warrant recalibration checks after anaesthesia and clamping; hypothesis-generating for monitor accuracy in aortic surgery.
The LiDCO plus monitor (LiDCO Ltd, Cambridge, UK) uses pulse contour analysis of the arterial pressure waveform to indicate changes in stroke volume and cardiac output. Calibration against a lithium indicator dilution method is required to permit display of absolute values in addition to trends. The effect of haemodynamic changes during anaesthesia and surgery on this calibration factor has not previously been studied. Therefore, we investigated whether it remained constant during elective abdominal aortic aneurysm surgery in 15 patients. Comparison between the calibration factor values at different time points was made by repeated recalibration throughout the peri-operative period. Calibration factor increased by a mean of 53% after anaesthesia (epidural plus general) (p = 0.03) and decreased by a mean of 40% after aortic clamping (p = 0.0001). Recalibration should be undertaken after induction of anaesthesia and after aortic clamping if absolute values of cardiac output and stroke volume are required.
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Beattie et al. (2010) conducted an observational in Elective abdominal aortic aneurysm (n=15). Anaesthesia and aortic clamping vs. Different time points (repeated recalibration) was evaluated on Calibration factor values (p=0.03 and 0.0001). Anaesthesia increased the LiDCO plus monitor calibration factor by a mean of 53%, while aortic clamping decreased it by a mean of 40% during aortic aneurysm repair.
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