Pulse transit time as an indirect marker for variations in cardiovascular related reactivity

Changes in left ventricular ejection time and pulse transit time derived from finger photoplethysmogram and electrocardiogram during moderate haemorrhage

“…Left ventricular ejection time was found to be correlated with the left ventricular ejection time (LVET) measured from Doppler aortic flow (Chan et al, 2007a), which confirms that LVET p can reflect changes in LVET (Quarry-Pigott et al, 1973;Geeraerts et al, 2004). The time interval between ventricular electrical activity and the arrival of a peripheral pulse wave is commonly referred to as PTT (Obrist et al, 1979;Newlin, 1981;Contrada et al, 1995;Foo & Lim, 2006). PTT is a sum of the ventricular pre-ejection period (PEP), which corresponds to the timing from the onset of ventricular depolarization to the onset of ventricular ejection, and the vascular transit time (VTT), which defines the period for the arterial pulse wave to travel from the aortic valve to the peripheral arteries.…”

Altered Nocturnal Cardiovascular Control in Children With Sleep-Disordered Breathing

“…Although the degree of correlation between systolic blood pressure (SBP) and PTT was repeatedly reported to be moderate, it has been suggested that variations in PTT can be exploited to track changes in SBP in a semiquantitative fashion. 10,11 Increased BP variability and reduced BRS have been previously reported in children with SDB, indicative of impaired cardiovascular control, 12,13 and a long-term follow-up study suggests that resolution of SDB normalizes BRS. 14 The aim of this study was to probe cardiovascular control in children with SDB during quiet, event-free sleep in comparison to healthy children using a multivariate autoregressive closedloop process model by exploiting standard PSG and to establish whether AT improves cardiovascular control in the short term.…”

Minimum Variance Signal Selection for Aorta Radius Estimation Using Radar

“…(2) According to [3,4,13], there is a nonlinear relationship between mean arterial pressure (P) and compliance (see below).…”

“…Noninvasive measurements of blood pressure (BP) can be performed using the sphygmomanometer, photoplethysmograph [1], tonography [2], and pulse transit time [3]. However, they all rely on peripheral measurement points.…”