Allen JE. Cricopharyngeal function or dysfunction: what’s the deal? Curr Opin Otolaryngol Head Neck Surg. 2016;24(6):494–9.

Article  PubMed  Google Scholar 

Levendag PC, et al. Dysphagia disorders in patients with cancer of the oropharynx are significantly affected by the radiation therapy dose to the superior and middle constrictor muscle: a dose-effect relationship. Radiother Oncol. 2007;85(1):64–73.

Article  PubMed  Google Scholar 

Bossi P, et al. Nasopharyngeal carcinoma: ESMO-EURACAN clinical practice guidelines for diagnosis, treatment and follow-up. Ann Oncol. 2021;32(4):452–65.

Article  CAS  PubMed  Google Scholar 

Rogus-Pulia NM, et al. Changes in swallowing physiology and patient perception of swallowing function following chemoradiation for head and neck cancer. Dysphagia. 2014;29:223–33.

Article  PubMed  Google Scholar 

Messer JA, et al. Magnetic resonance imaging of swallowing-related structures in nasopharyngeal carcinoma patients receiving IMRT: longitudinal dose–response characterization of quantitative signal kinetics. Radiother Oncol. 2016;118(2):315–22.

Article  PubMed  PubMed Central  Google Scholar 

Pu D, et al. The relationships between radiation dosage and long-term swallowing kinematics and timing in nasopharyngeal carcinoma survivors. Dysphagia. 2022;37(3):612–21.

Article  PubMed  Google Scholar 

Yeh S-A, et al. Treatment outcomes and late complications of 849 patients with nasopharyngeal carcinoma treated with radiotherapy alone. Int J Radiat Oncol Biol Phys. 2005;62(3):672–9.

Article  PubMed  Google Scholar 

Cock C, Omari T. Diagnosis of swallowing disorders: how we interpret pharyngeal manometry. Curr Gastroenterol Rep. 2017;19(1):1–14.

Google Scholar 

Wu C-H, et al. Dysphagia after radiotherapy: endoscopic examination of swallowing in patients with nasopharyngeal carcinoma. Ann Otol Rhinol Laryngol. 2000;109(3):320–5.

Article  CAS  PubMed  Google Scholar 

Ouyang Y, et al. Precise visualization of cricopharyngeal dysfunction after radiation therapy for nasopharyngeal carcinoma using ultrasound-guided balloon catheter dilatation: a case description. Quant Imaging Med Surg. 2022;12(9):4713.

Article  PubMed  PubMed Central  Google Scholar 

Cook IJ. Cricopharyngeal function and dysfunction. Dysphagia. 1993;8:244–51.

Article  CAS  PubMed  Google Scholar 

Berg HM, et al. Cricopharyngeal myotomy: a review of surgical results in patients with cricopharyngeal achalasia of neurogenic origin. Laryngoscope. 1985;95(11):1337–40.

Article  CAS  PubMed  Google Scholar 

Jeong S-H, et al. Endoscopic botulinum toxin injection for treatment of pharyngeal dysphagia in patients with cricopharyngeal dysfunction. Scand J Gastroenterol. 2018;53(10–11):1201–5.

Article  CAS  PubMed  Google Scholar 

Fong R, et al. Videofluoroscopic and manometric outcomes of cricopharyngeus balloon dilation for treatment of pharyngo-esophageal dysphagia associated with nasopharyngeal cancer: a case series. Laryngoscope Investig Otolaryngol. 2021;6(5):1077–87.

Article  PubMed  PubMed Central  Google Scholar 

Lee SY, Seo H-G, Paik N-J. Botulinum toxin injection for dysphagia: a blinded retrospective videofluoroscopic swallowing study analysis. Am J Phys Med Rehabil. 2009;88(6):491–4.

Article  PubMed  Google Scholar 

Kelly EA, et al. Botulinum toxin injection for the treatment of upper esophageal sphincter dysfunction. Ann Otol Rhinol Laryngol. 2013;122(2):100–8.

Article  PubMed  PubMed Central  Google Scholar 

Alfonsi E, et al. Botulinum toxin is effective in the management of neurogenic dysphagia. Clinical-electrophysiological findings and tips on safety in different neurological disorders. Front Pharmacol. 2017;8: 80.

Article  PubMed  PubMed Central  Google Scholar 

Chang Y-C, et al. Dysphagia in patients with nasopharyngeal cancer after radiation therapy: a videofluoroscopic swallowing study. Dysphagia. 2003;18:135–43.

Article  PubMed  Google Scholar 

Omari TI, et al. Upper esophageal sphincter impedance as a marker of sphincter opening diameter. Am J Physiol-Gastrointest Liver Physiol. 2012;302(9):G909–13.

Article  CAS  PubMed  Google Scholar 

Hoffman HT, et al. Steering sheath for 2-nostril Transnasal office laryngoscopy. Ann Otol Rhinol Laryngol. 2018;127(2):99–104.

Article  PubMed  Google Scholar 

Onogi K, et al. Immediate effectiveness of balloon dilatation therapy for patients with dysphagia due to cricopharyngeal dysfunction. Jpn J Compr Rehabil Sci. 2014;5:87–92.

Article  Google Scholar 

Iwano M, Saitoh E, Kagaya H, Onogi K, Inamoto Y, Shibata S, Akahori R, inventors. Balloon catheter. WIPO Patent WO2019107308A1. 2019-06-06. https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019107308

Scaglione F. Conversion ratio between Botox®, Dysport®, and Xeomin® in clinical practice. Toxins. 2016;8(3):65.

Article  PubMed  PubMed Central  Google Scholar 

Yun JY, et al. Dysport and Botox at a ratio of 2.5: 1 units in cervical dystonia: a double-blind, randomized study. Mov Disord. 2015;30(2):206–13.

Article  CAS  PubMed  Google Scholar 

Pan L, et al. Comparing lanbotulinumtoxinA (Hengli®) with onabotulinumtoxinA (Botox®) and incobotulinumtoxinA (Xeomin®) in the mouse hemidiaphragm assay. J Neural Transm. 2019;126:1625–9.

Article  CAS  PubMed  Google Scholar 

Kocdor P, Siegel ER, Tulunay-Ugur OE. Cricopharyngeal dysfunction: a systematic review comparing outcomes of dilatation, botulinum toxin injection, and myotomy. Laryngoscope. 2016;126(1):135–41.

Article  CAS  PubMed  Google Scholar 

Kim BW, et al. Botulinum toxin injection in the treatment of postextubation dysphagia: a case report. Ann Rehabil Med. 2018;42(2):358–62.

Article  PubMed  PubMed Central  Google Scholar 

Costa MMB. Videofluoroscopy: the gold standard exam for studying swallowing and its dysfunction. 2010, SciELO Brasil. pp. 327–328.

Ding X, et al. Prevalence and clinical correlation of dysphagia in Parkinson disease: a study on Chinese patients. Eur J Clin Nutr. 2018;72(1):82–6.

Article  CAS  PubMed  Google Scholar 

Crary MA, Mann GDC, Groher ME. Initial psychometric assessment of a functional oral intake scale for dysphagia in stroke patients. Arch Phys Med Rehabil. 2005;86(8):1516–20.

Article  PubMed  Google Scholar 

Kotz T, et al. Prophylactic swallowing exercises in patients with head and neck cancer undergoing chemoradiation: a randomized trial. Arch Otolaryngol Head Neck Surg. 2012;138(4):376–82.

Article  PubMed  Google Scholar 

Steele CM, Grace-Martin K. Reflections on clinical and statistical use of the penetration-aspiration scale. Dysphagia. 2017;32(5):601–16.

Article  PubMed  PubMed Central  Google Scholar 

Rommel N, et al. Bolus residue scale: an easy-to-use and reliable videofluoroscopic analysis tool to score bolus residue in patients with dysphagia. Int J Otolaryngol. 2015;2015(1): 780197.

PubMed  PubMed Central  Google Scholar 

Hutcheson KA, et al. Dynamic imaging grade of swallowing toxicity (DIGEST): scale development and validation. Cancer. 2017;123(1):62–70.

Article  PubMed  Google Scholar 

Sphincter A-PUE. Non-Invasive Sensor-Based Estimation of Anterior-Posterior Upper Esophageal Sphincter Opening Maximal Distension.

Zhang J, et al. Laryngeal elevation velocity and aspiration in acute ischemic stroke patients. PLoS ONE. 2016;11(9): e0162257.

Article  PubMed  PubMed Central  Google Scholar 

Paik N-J, et al. Movement of the hyoid bone and the epiglottis during swallowing in patients with dysphagia from different etiologies. J Electromyogr Kinesiol. 2008;18(2):329–35.