Reliability Of T-Line300 For Continuous Non-invasive Arterial Pressure Monitoring In Surgical Patients

Objective:This study is aimed to compare the agreement of T-Line300 and invasive arterial pressure monitoring in surgical patients with general anesthesia.Methods:Twenty-nine patients undergoing elective surgery with general anaesthesia were enrolled. An arterial line was placed into the radial artery or the dorsalis pedis artery. The T-Line300 monitoring was performed on the other arm. Continuous non-invasive arterial pressure measurements obtained from T-Line300 and values measured directly from an arterial catheter were simultaneously recorded every fifteen minutes. When phenylephrine or phentolamine was used for management of hemodynamic instability, arterial pressure values measured both non-invasively and invasively were recorded immediately before vasoactive drug administration and repeated every minute for ten minutes. Values were compared using the Bland–Altman method to investigate the accuracy(bias) and precision(sd) of the non-invasively assessed AP measurements. A 4-quadrant concordance plots was performed to analyze the trending abilities of T-Line300 after administration of vasoactive drugs.Results:The bias±sd between T-Line300-derived BP and invasively assessed BP was(-5.8±14.5)mm Hg for systolic arterial pressure,(-5.8±14.5)mm Hg for diastolic arterial pressure, and(2.1±10.1) mm Hg for mean arterial pressure, respectively. Concordance analysis with 4-quadrant plots revealed a concordance of 0.548 for SAP changes,0.580 for DAP changes,and 0.528 for MAP changes.Conclusions:The T-Line300 system is capable of providing continuous non-invasive BP measurements with high accuracy(low bias) compared with invasive values using an arterial catheter. But further development is necessary to improve its precision and ability of tracking BP changes.