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The T-Line TL-200 system for continuous non-invasive blood pressure measurement in medical intensive care unit patients

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Abstract

Purpose

The T-Line TL-200 (Tensys Medical, San Diego, CA, USA) is a non-invasive arterial blood pressure (BP) monitoring system allowing continuous “beat-to-beat” monitoring of systolic arterial pressure (SAP), mean arterial pressure (MAP), and diastolic arterial pressure (DAP). It provides a real-time BP waveform like that obtained using an arterial catheter. The aim of this study was to compare BP measurements obtained using the T-Line TL-200 with simultaneous invasive BP measurements using a femoral arterial catheter in unselected critically ill medical patients.

Methods

In 28 patients treated in a medical intensive care unit (ICU), BP values were simultaneously obtained using a femoral arterial catheter and the T-Line TL-200. All recorded data were included in the final analysis. For comparison of BP measurements, Bland–Altman analysis accounting for repeated measurements was performed (primary endpoint).

Results

A total of 76,826 pairs of BP measurements (each consisting of SAP, MAP, and DAP) were analyzed. For MAP, Bland–Altman analysis revealed a mean difference of +0.47 mmHg (95 % limits of agreement −16.53 to +17.46 mmHg). For SAP and DAP, the bias and 95 % limits of agreement were −9.01 mmHg (−37.47 to +19.45 mmHg) and +5.22 mmHg (−13.50 to +23.94 mmHg), respectively.

Conclusions

Non-invasive, continuous, radial BP measurement with the T-Line TL-200 is basically feasible in medical ICU patients (with a low bias for MAP compared to MAP assessed using a femoral arterial catheter). High limits of agreement (particularly of SAP and DAP) preclude the use of the device as a single source of BP information in unstable critically ill patients.

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Acknowledgments

Tensys Medical Inc. (San Diego, CA, USA) provided the T-Line® TL-200 device and the corresponding medical disposables (wrist splint and T-Line® sensor) as well as a computer with software for data recording. Tensys Medical Inc. was not involved in the conception of the study, collection and analysis of data, drafting of the manuscript, or in the decision to submit the manuscript for publication.

Conflicts of interest

Wolfgang Huber is member of the Medical Advisory Board of Pulsion Medical Systems (Munich, Germany), the manufacturer of the arterial catheters used for invasive blood pressure monitoring in this study. For all other authors there is no conflict of interest to disclose.

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Authors and Affiliations

  1. II. Medizinische Klinik und Poliklinik, Klinikum rechts der Isar der Technischen Universität München, Ismaninger Straße 22, 81675, Munich, Germany

    Bernd Saugel, Florian Fassio, Agnes S. Meidert, Roland M. Schmid & Wolfgang Huber

  2. Institut für Medizinische Statistik und Epidemiologie, Klinikum rechts der Isar der Technischen Universität München, Ismaninger Straße 22, 81675, Munich, Germany

    Alexander Hapfelmeier

Authors
  1. Bernd Saugel
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  2. Florian Fassio
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  3. Alexander Hapfelmeier
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  4. Agnes S. Meidert
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  5. Roland M. Schmid
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  6. Wolfgang Huber
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Corresponding author

Correspondence to Bernd Saugel.

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Saugel, B., Fassio, F., Hapfelmeier, A. et al. The T-Line TL-200 system for continuous non-invasive blood pressure measurement in medical intensive care unit patients. Intensive Care Med 38, 1471–1477 (2012). https://doi.org/10.1007/s00134-012-2617-x

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  • DOI: https://doi.org/10.1007/s00134-012-2617-x

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