Key result
The Tensys T-line showed wide 95% confidence intervals for mean arterial pressure (24-28 mmHg) compared to intra-arterial catheters, precluding its reliable use in spine surgery.
Why the study?
Does the Tensys T-line provide reliable estimates of mean arterial pressure and pulse pressure variation compared to an intra-arterial catheter in patients undergoing spine surgery?
Observational (n=25)
Does the Tensys T-line provide reliable estimates of mean arterial pressure and pulse pressure variation compared to an intra-arterial catheter in patients undergoing spine surgery?
The Tensys T-line non-invasive radial artery tonometry does not provide reliable estimates of mean arterial pressure or pulse pressure variation compared to an intra-arterial catheter during spine surgery.
Caution against Tensys T-line use for MAP in spine surgery; Level 5 data leaves open need for validated non-invasive alternatives.
The Tensys T-line uses tonometry to reproduce the arterial blood pressure tracing non-invasively. The purpose of this study was to assess the agreement between estimates of the T-line and an intra-arterial catheter (for both mean arterial pressure [MAP] and pulse pressure variation [PPV]) in the setting of spine surgery. Continuous blood pressure data were collected for 7507 minutes from 25 patients. Five increasingly aggressive T-line filters were applied. The mean bias for mean, diastolic and systolic blood pressure ranged from 3.4-6.4, 3.1-7.1 and 0.1-0.8 mmHg and 6.5-11.8% for PPV. Ninety-five per cent confidence intervals for mean, diastolic and systolic blood pressure ranged from 24-28, 23.1-24.7 and 33.4-35.6 mmHg for 14-21% for PPV. The limits of agreement preclude the use of the T-line for reliable estimation of MAP or PPV in spine surgery.
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Colquhoun et al. (2013) conducted an observational in Spine surgery (n=25). Tensys T-line (radial artery tonometry) vs. Intra-arterial catheter was evaluated on Agreement between T-line and intra-arterial catheter for mean arterial pressure (MAP) and pulse pressure variation (PPV). The Tensys T-line showed wide 95% confidence intervals for mean arterial pressure (24-28 mmHg) compared to intra-arterial catheters, precluding its reliable use in spine surgery.
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