Results 71 to 80 of about 171,293 (296)

Head-up tilt test in complicated neurocardiogenic syncope in children [PDF]

Journal of Korean Medical Science, 1997
To confirm the usefulness of head-up tilt test (HUT) in neurocardiogenic syncope (NCS) with complicating clinical features, retrospective analysis were done on 12 selected children. The age at onset was 12.7 +/- 1.9 (mean +/- SD) years. Associated clinical features were postoperative congenital heart disease (PO CHD) in 3, coexistent arrhythmia in 8 ...
C I, Noh, H S, Kim
openaire   +2 more sources

Packaging of Macroscopic Material Payloads: Needs, Challenges, Concepts, and Future Directions

Advanced Engineering Materials, EarlyView.
This review introduces a unified framework that decomposes any macroscopic packaging system into the payload, packaging material, and packaging strategy and combines them into a conceptual packaging equation: packaging strategy = payload + packaging material.
Venkata S. R. Jampani, Manos Anyfantakis
wiley   +1 more source

Investigation of in vivo measurement of cerebral cytochrome-c-oxidase redox changes using near-infrared spectroscopy in patients with orthostatic hypotension [PDF]

, 2007
We have previously used a continuous four wavelength near infrared spectrometer to measure changes in the cerebral concentrations of oxy- (Δ[HbO2] and deoxy- haemoglobin (Δ[HHb]) during head-up tilt in patients with primary autonomic failure.
Cooper, C.E., Delpy, D.T., Elwell, C.E., Leung, T.S., Smith, M., Tachtsidis, I., Tisdall, M.   +6 more
core  

A Numerical–Experimental Approach for Multi‐Matrix Fiber‐Reinforced Plastics Characterization Using Finite Element Model Updating

Advanced Engineering Materials, EarlyView.
A numerical–experimental framework is developed for characterizing multi‐matrix fiber‐reinforced polymers (MM‐FRPs) combining epoxy and polyurethane matrices. Harmonic bending tests are integrated with finite element model updating (FEMU) to simultaneously identify elastic and viscoelastic material parameters.
Rodrigo M. Dartora, Tales V. Lisbôa, Axel Spickenheuer, Rogério J. Marczak, Jakson M. Vassoler   +4 more
wiley   +1 more source

COMPARISON OF HEART RATE VARIABILITY IN NEGATIVE AND POSITIVE RESPONDERS TO ACTIVE PHASE OF HEAD-UP TILT TEST

Pakistan Armed Forces Medical Journal, 2018
Objective: To compare heart rate variability in negative and positive responders to active phase of head-up tilt test. Study Design:Cross-sectional comparative study.
Sara Naeem, Hira Ashraf, Azmat Hayat, Muhammad Alamgir Khan   +3 more
doaj  

A New Approach to the Etiology of Syncope: Infection as a Cause

Viruses
Background/Objectives: Syncope is a common clinical occurrence, with neurally mediated and orthostatic types accounting for about 75% of cases. The exact pathophysiological mechanisms remain unclear, with recent evidence suggesting autonomic nervous ...
Branislav Milovanovic, Nikola Markovic, Masa Petrovic, Vasko Zugic, Milijana Ostojic, Milica Dragicevic-Antonic, Milovan Bojic   +6 more
doaj   +1 more source

Is there any link between vitamin D deficiency and vasovagal syncope?

Journal of Arrhythmia, 2020
Background This study aimed to investigate serum 25[OH]D levels between patients with vasovagal syncope (VVS) diagnosed with head‐up tilt table test (HUTT) and age‐matched healthy people.
Songül Usalp, Hatice Kemal, Ümit Yüksek, Belma Yaman, Aziz Günsel, Oğuzhan Edebal, Onur Akpınar, Levent Cerit, Hamza Duygu   +8 more
doaj   +1 more source

Impaired cerebral oxygenation in heart failure patients at rest and during head‐up tilt testing

ESC Heart Failure, 2021
Aims Heart failure (HF) confers potentially negative effects on the brain and autonomic nervous system. The measurement cerebral tissue oxygen saturation (SctO2) may aid in understanding such effects.
Isabella Kharraziha, Hannes Holm, Martin Magnusson, Per Wollmer, John Molvin, Amra Jujic, Artur Fedorowski, Erasmus Bachus, Viktor Hamrefors   +8 more
doaj   +1 more source

The Postural Tachycardia Syndrome (POTS): Pathophysiology, Diagnosis & Management [PDF]

, 2006
Postural tachycardia syndrome (POTS), characterized by orthostatic tachycardia in the absence of orthostatic hypotension, has been the focus of increasing clinical interest over the last 15 years 1. Patients with POTS complain of symptoms of tachycardia,
Raj, Satish R
core   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source