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Updated: Aug 13, 2026
Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
Published on: March 21, 2013
Comparison of computational algorithms applied on transthoracic impedance waveforms to predict head-up tilt table
D Schang1, E Bellard, G Plantier
1Ecole Supérieure d'Electronique de l'Ouest 4, rue Merlet de la Boulaye, P.O. Box 926, 49009 Angers Cedex 01, France. daniel.schang@eseo.fr
Abstract:
The goal of the present study was to develop and evaluate new algorithms for the prediction of the outcome of a head-upright tilt test (HUTT). Using transthoracic impedance and its first derivative, we attempted to determine if indexes computed on these waveforms could detect a positive outcome to a 70 degrees -45min HUTT with reliable sensitivity and specificity. The methods were evaluated retrospectively in a group of 70 patients and validated prospectively in a group of 59 patients. The best detector obtained used a neural network. It compares very favorably with published results for other syncope detectors.
