Fluoroscopic surrogate for pharyngeal strength: The pharyngeal constriction ratio (PCR)

Rebecca J Leonard, Catherine J. Rees, Peter C Belafsky, Jacqui Allen

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


The pharyngeal constriction ratio (PCR), derived directly from videofluoroscopy without the need for manometry, requires validation as a surrogate for pharyngeal strength. A correlation of -0.70 was previously identified between PCR and pharyngeal clearing pressures (PP) on separate fluoroscopic and manometric studies. As PP increases, PCR decreases. The objective of the current study was to evaluate the correlation between PCR and PP in 25 patients undergoing simultaneous fluoroscopy and pharyngeal manometry. The effect of the manometric catheter on PCR was also investigated. The correlation between the PCR and averaged pharyngeal clearing pressures was -0.72 (p < 0.001). All patients with a PCR > 0.25 had a PP < 60 mmHg. PCR did not differ significantly as a consequence of the manometric catheter. Results suggest the utility of an objective fluoroscopic measure in assessing pharyngeal strength when manometry may not be available or possible.

Original languageEnglish (US)
Pages (from-to)13-17
Number of pages5
Issue number1
StatePublished - Mar 2011


  • Deglutition
  • Deglutition disorders
  • Pharyngeal constriction
  • Pharyngeal pressure

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Gastroenterology
  • Speech and Hearing


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