Simultaneous X-ray Video-Fluoroscopy and Pulsed Ultrasound Velocimetry Analyses of the Pharyngeal Phase of Swallowing of Boluses with Different Rheological Properties
Reviewartikel, 2020

The Ultrasound Velocity Profiling (UVP) technique allows real-time, non-invasive flow mapping of a fluid along a 1D-measuring line. This study explores the possibility of using the UVP technique and X-ray video-fluoroscopy (XVF) to elucidate the deglutition process with the focus on bolus rheology. By positioning the UVP probe so that the pulsed ultrasonic beam passes behind the air-filled trachea, the bolus flow in the pharynx can be measured. Healthy subjects in a clinical study swallowed fluids with different rheological properties: Newtonian (constant shear viscosity and non-elastic); Boger (constant shear viscosity and elastic); and shear thinning (shear rate-dependent shear viscosity and elastic). The results from both the UVP and XVF reveal higher velocities for the shear thinning fluid, followed by the Boger and the Newtonian fluids, demonstrating that the UVP method has equivalent sensitivities for detecting the velocities of fluids with different rheological properties. The velocity of the contraction wave that clears the pharynx was measured in the UVP and found to be independent of bolus rheology. The results show that UVP not only assesses accurately the fluid velocity in a bolus flow, but it can also monitor the structural changes that take place in response to a bolus flow, with the added advantage of being a completely non-invasive technique that does not require the introduction of contrast media.

Deglutition

Ultrasound

Video-fluoroscopy

Deglutition disorders

Rheology

Fluids

Författare

Waqas Qazi

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

RISE Research Institutes of Sweden

O. Ekberg

Skånes universitetssjukhus (SUS)

J. Wiklund

Incipientus Ultrasound Flow Technologies AB

Rashid Mansoor

Nuffield Department of Medicine

Mats Stading

RISE Research Institutes of Sweden

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Dysphagia

0179-051X (ISSN) 1432-0460 (eISSN)

Ämneskategorier

Medicinsk laboratorie- och mätteknik

Medicinsk bildbehandling

DOI

10.1007/s00455-020-10092-4

PubMed

32048021

Mer information

Senast uppdaterat

2020-03-06