Premium
The effect of anaesthesia and aortic clamping on cardiac output measurement using arterial pulse power analysis during aortic aneurysm repair *
Author(s) -
Beattie C.,
Moores C.,
Thomson A. J.,
Nimmo A. F.
Publication year - 2010
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.2010.06558.x
Subject(s) - medicine , anesthesia , cardiac output , stroke volume , general anaesthesia , abdominal aortic aneurysm , aneurysm , blood pressure , mean arterial pressure , aortic pressure , hemodynamics , abdominal aorta , pulse (music) , pulse pressure , stroke (engine) , aortic aneurysm , aorta , cardiology , surgery , heart rate , mechanical engineering , detector , electrical engineering , engineering
Summary The LiDCO TM 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.