Key result
Head-up tilt was associated with a decrease in linear QTV-RRV coupling, while intrinsic QTV became more prominent during the tilt.
Why the study?
Does a bivariate point-process model effectively capture time-varying mutual QTV-RRV interactions during a tilt table test in healthy subjects?
Population
15 healthy subjects undergoing a tilt table test
Design
Other
Authors
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Hypothesis-generating for tilt-induced repolarization dynamics; requires validation before clinical or patient application.
Observational (n=15)
Does a bivariate point-process model effectively capture time-varying mutual QTV-RRV interactions during a tilt table test in healthy subjects?
The proposed bivariate point-process model successfully quantifies dynamic changes in repolarization variability independent of RR variability during physiological stress.
Valenza et al. (2014) conducted an observational in Healthy (n=15). Head-up tilt was evaluated on Time-varying mutual QTV-RRV interactions. Head-up tilt was associated with a decrease in linear QTV-RRV coupling, while intrinsic QTV became more prominent during the tilt.