Pulse transit time (PTT) measured as the time delay between invasive proximal and distal blood pressure (BP) or flow waveforms (invasive PTT [I-PTT]) tightly correlates with BP PTT estimated as the time delay between noninvasive proximal and distal arterial waveforms could therefore permit cuff-less BP monitoring. A popular noninvasive PTT estimate for this application is the time delay between...

The use of problem-based learning (PBL) in the Charité Berlin Human Medicine model curriculum requires the annual training of 80 to 100 new PBL tutors using PBL tutor training (PTT). Therefore, the following three measures were taken: The existing traditional PTT (Trad-PTT) was further developed into an interactive PTT (Inter-PTT), which is using more interactive teaching tools. Both PTT concep...

OBJECTIVES Adult-acquired flat foot secondary to a dysfunctional posterior tibialis tendon (PTT) is often treated by surgical transfer of the flexor digitorum longus tendon (FDLT). In this study, the authors compared normal PTT, stage II dysfunctional PTT and replacement FDLT, aiming to define changes in collagen modification, glycosaminoglycan (GAG) and the expression of matrix and metalloprot...

BACKGROUND Pulmonary transit time (PTT) is an indirect measure of preload and left ventricular function, which can be estimated using the indicator dilution theory by contrast-enhanced ultrasound (CEUS). In this study, we first assessed the accuracy of PTT-CEUS by comparing it with dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). Secondly, we tested the hypothesis that PTT-CEUS c...

INTRODUCTION Current methods employed for scoring arousals in children may not be sensitive enough. Because arousals are associated with increases in sympathetic tone, measurement of sympathetic activity using noninvasive techniques could provide useful surrogate markers for arousals in children. METHODS Ten healthy children underwent overnight polysomnographic assessment with simultaneous pu...

Push-to-Talk (PTT) is a service that allows users using mobile phones in a way like walkie-talkie. All big telecommunication vendors and operators consider PTT an emerging application. 3GPP and OMA regulate the PTT specifications on the basis of Session Initiation Protocol (SIP) to assure interoperability. However, current PTT services are dedicated to cellular phones. We would like to realize ...

Background: The pulse transit time (PTT) is the time interval between the R-wave of the ECG and the appearance of the pulse wave in the periphery during the same cardiac cycle. PTT is influenced by various factors including sympathetic tone and vascular compliance. The authors assessed the effect of anesthesia, intubation and laparoscopic (LPS) versus laparotomic (LPT) surgery on PTT. Methods: ...

Push-to-talk (PTT) is a walkie-talkie like service which performs an efficient and instant voice over Internet protocol (VoIP) communication in mobile ad hoc network especially for certain circumstances, such as battle field and earthquake or disaster relief. The authors have designed and implemented the PTT mechanism in ad hoc VoIP network. The PTT server and user agent combined with the pseud...