caa a22 4500 465739768 CHVBK 20180323111805.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02368453 doi (NATIONALLICENCE)springer-10.1007/BF02368453 A kinematic study of the oropharyngeal swallowing of a liquid [Elektronische Daten] [David Ku, Ping-Ping Ma, Fred McConnel, Danko Cerenko] Swallowing can become a problem for people with advanced age or laryngeal cancer, especially after surgical resection. The purpose of this study was to quantify the mechanical transport of the bolus through the throat by simultaneously comparing the instantaneous position and velocity of the bolus to the generation of pressure at different sites in the oropharyngeal cavity. Swallows of barium liquid were analyzed using Manofluorography, which simultaneously recorded pressure and barium position through a split screen display. Frame-by-frame analysis was used to describe bolus motion. The graph of head and tail movement showed an hourglass shape with an initial slow, then rapid movement of the bolus head. The peak bolus head velocity averaged 47 cm/s and the maximum acceleration was 460 cm/s2. Comparison of pressure traces with the kinematic curves revealed the relative timings of tongue movement, negative suction pressure from the pharyngoesophageal segment and the contraction wave. The magnitude of the gravity and resistance forces were estimated and relative strengths compared. The pharynx can be viewed as a dynamic conduit with changing diameters. The tongue driving force initially drove the bolus. Laryngeal elevation and the pharyngoesophageal segment developed a prebolus negative suction pressure ahead of the bolus. For vertical swallowing of the barium liquid, gravity played the dominant role in head transport. Contraction of the pharyngeal walls served to clear the tail of the bolus from the pharynx. These results aid in the understanding of the physiology of normal swallowing and provide quantitative data for the evaluation of oropharyngeal reconstruction. Pergamon Press plc, 1990 Swallowing nationallicence Dysphagia nationallicence Pressure nationallicence Fluoroscopy nationallicence Manofluorography nationallicence Force nationallicence Unsteady nationallicence Ku David Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA aut Ma Ping-Ping Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA aut McConnel Fred Department of Surgery, Emory University School of Medicine, Atlanta, GA aut Cerenko Danko Department of Surgery, Emory University School of Medicine, Atlanta, GA aut Annals of Biomedical Engineering Kluwer Academic Publishers 18/6(1990-11-01), 655-669 0090-6964 18:6<655 1990 18 10439 https://doi.org/10.1007/BF02368453 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02368453 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ku David Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA aut NATIONALLICENCE 700 1- Ma Ping-Ping Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA aut NATIONALLICENCE 700 1- McConnel Fred Department of Surgery, Emory University School of Medicine, Atlanta, GA aut NATIONALLICENCE 700 1- Cerenko Danko Department of Surgery, Emory University School of Medicine, Atlanta, GA aut NATIONALLICENCE 773 0- Annals of Biomedical Engineering Kluwer Academic Publishers 18/6(1990-11-01), 655-669 0090-6964 18:6<655 1990 18 10439 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer