81585
document
In vivo assessment of catheter-tip PO2 sensor : sampling lumen fabrication . Fabrication of the sampling lumen of an intra-arterial PO2 sensor is performed in standard catheters mechanically or by laser . Clinical evaluation is performed with respect to catheter insertion , complications , accuracy of oxygen sensor data and fibrin deposition on the catheter surface . The success rate for catheter insertion is 57 % for 138 standard and 50 % for 74 laser-cut catheters studied . The proportion of catheter failures ( blocked or non-reading ) is 14 % in laser-cut compared with 30 % in standard . These differences are not statistically significant at the 5 % level . There is no clinically significant difference in sensor accuracy , with 37.5 % of results within +/- 0.05 kPa and 80 % within +/- 2.0 kPa of simultaneous blood gas values . Drift is within +/- 0.3 kPa h-1 for 78 % of monitoring time . Significant errors of recalibration occur in 6 % of calibrations . Scanning electron micrographs demonstrate a much smaller sampling lumen in the laser-cut group , but no reduction in fibrin deposition at the site of the sampling hole . The low success rate for catheter insertion is a problem because of cost implications . The accuracy of the system is usually sufficient for clinical purposes , provided the calibration is checked every 4 h .
81586
Intervention_Physical
catheter-tip PO2 sensor :
81587
Intervention_Physical
intra-arterial PO2 sensor
81588
Intervention_Physical
catheter
81589
Outcome_Other
assessment
81590
Outcome_Other
catheter insertion , complications , accuracy of oxygen sensor data and fibrin deposition on the catheter surface
81591
Outcome_Other
success rate for catheter insertion
81592
Outcome_Other
catheter failures ( blocked or non-reading )
81593
Outcome_Other
sensor accuracy
81594
Outcome_Other
Drift
81595
Outcome_Other
Significant errors of recalibration
81596
Outcome_Other
sampling lumen
81597
Outcome_Other
fibrin deposition
81598
Outcome_Other
success rate for catheter insertion
81599
Outcome_Other
accuracy
81600
Participant_Condition
catheter-tip
81601
Participant_Condition
catheters
81602
Participant_Condition
catheter
81603
Participant_Condition
catheter
81604
Participant_Sample-size
138 standard
81605
Participant_Sample-size
74 laser-cut
81606
Participant_Condition
catheters