On 2017 Dec 13, Franz Schelling commented:

"Without a good understanding of the vascular pathophysiologic factors that influence the patency of ballooned IJVs, it is difficult to perform any meaningful work relating any neurologic condition that may or may not be associated with constricted venous outflow." ... ought not this point given in the papers 'Discussion' be given in its 'Conclusion' part.

Three questions asides: (1) Wasn't it observed that the muscular IJV entrapments depend widely on (a) head, (b) shoulder position and (c) jaw bracing? with (a) applying first to the sternal head of the sternocleidomastoid, (a)+(b) to the omohyoid, and (c) to the digastric muscle? (2) What about the often observed efficacy of deep inspiration/chest bracing in terms of flow reversals in the left IJV? (3) MRI findings of a severe hypoplasia of the entire J1 length seem preferentially due to its broad clamping between sternal part of the sternocleidomastoid and anterior scalene muscle - a problem which any good ENT surgeon can solve.

Just some cues which may prove useful for making further advances.

On 2017 Dec 13, Franz Schelling commented:

"Without a good understanding of the vascular pathophysiologic factors that influence the patency of ballooned IJVs, it is difficult to perform any meaningful work relating any neurologic condition that may or may not be associated with constricted venous outflow." ... ought not this point given in the papers 'Discussion' be given in its 'Conclusion' part.

Three questions asides: (1) Wasn't it observed that the muscular IJV entrapments depend widely on (a) head, (b) shoulder position and (c) jaw bracing? with (a) applying first to the sternal head of the sternocleidomastoid, (a)+(b) to the omohyoid, and (c) to the digastric muscle? (2) What about the often observed efficacy of deep inspiration/chest bracing in terms of flow reversals in the left IJV? (3) MRI findings of a severe hypoplasia of the entire J1 length seem preferentially due to its broad clamping between sternal part of the sternocleidomastoid and anterior scalene muscle - a problem which any good ENT surgeon can solve.

Just some cues which may prove useful for making further advances.