Aneurysm sac pressure monitoring: Does the direction of pressure measurement matter in fibrinous thrombus? Jan-Willem Hinnen, MD, Daniel J. Rixen, PhD,

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Aneurysm sac pressure monitoring: Does the direction of pressure measurement matter in fibrinous thrombus? Jan-Willem Hinnen, MD, Daniel J. Rixen, PhD, Olivier H. Koning, MD, Hajo J. Van Bockel, MD, PhD, Jaap F. Hamming, MD, PhD Journal of Vascular Surgery Volume 45, Issue 4, Pages 812-816 (April 2007) DOI: 10.1016/j.jvs.2006.12.014 Copyright © 2007 The Society for Vascular Surgery Terms and Conditions

Fig 1 A, The experimental set-up consisted of a table (A) with a holder (B) to position the weights (C) at a right angle to the specimen of human fibrinous thrombus (D). Seven needles were positioned in the calibrated holes. The intersection of the needles was 7.5 mm above the tabletop. The angle between the applied force and the sensor is designated as α. B, A specimen of human fibrinous thrombus was positioned between the weight and the tabletop. The pressure catheter has been inserted in the thrombus. The needle has been withdrawn over the pressure catheter after catheter insertion. C, A piece of thrombus was been cut to check the sensor position after insertion. The sensor did not rotate after insertion. Measurements were always performed with the sensor in upward position. Journal of Vascular Surgery 2007 45, 812-816DOI: (10.1016/j.jvs.2006.12.014) Copyright © 2007 The Society for Vascular Surgery Terms and Conditions

Fig 2 Pressure measurements in 10 thrombi (mean ± standard error of the mean) after the weights were changed (applied pressure). Measurements were performed at different angles between the sensor and the applied force. Measurements at angles <90° differed statistically from those at 90° (P < .001). Differences between pressure measurements in the 10 samples of thrombus at the same angle were not statistically significant (P = .07). Journal of Vascular Surgery 2007 45, 812-816DOI: (10.1016/j.jvs.2006.12.014) Copyright © 2007 The Society for Vascular Surgery Terms and Conditions