An asymmetric smooth contour two-mass model for recurrent laryngeal nerve paralysis.
Irregular vocal fold vibrations are assumed to be a major cause of hoarseness. A common clinical condition presenting with hoarseness is a unilateral recurrent laryngeal nerve paralysis (RLNP). In order to explain high-speed video recordings of clinical RLNP, RLNP-type vocal fold vibrations are simulated by extending the well known two-mass model (2MM) to an asymmetric smooth-contour two-mass model (SC2MM). Polynomial interpolations form a smooth surface over the lumped elements of the 2MM. Laryngeal asymmetry is accounted for by introduction of an asymmetry coefficient and an anterior commissure angle which models a variable glottal closure insufficiency. Compared to the 2MM, the SC2MM yields a smaller glottal volume flow and is more stable in critical parameter constellations of RLNP-like conditions. It is able to model the vocal fold dynamics during a glottal closure insufficiency.
Dresel
Christian
C
Department of Neurology, Klinikum rechts der Isar, Technische Universitaet Muenchen, Germany. dresel@lrz.tu-muenchen.de
Mergell
Patrick
P
Hoppe
Ulrich
U
Eysholdt
Ulrich
U
D001696:Biomechanical Phenomena; D006685:Hoarseness / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D008954:Models, Biological; D014732:Vibration; D014826:Vocal Cord Paralysis / Q000150:complications / Q000503:physiopathology*; D014827:Vocal Cords / Q000503:physiopathology*