Figure 7.
Categorisation of non-obstructive dysphagia patients based on Pressure Flow Index (PFI) and Impedance Ratio enables a dichotomous separation of patients who have predominately abnormal bolus clearance (mostly IEM) and/or those with abnormal bolus flow resistance (mostly Normal Esophageal Motility, NEM). Mean viscous bolus data from individual patients and controls are shown. The dotted box indicates the range determined for control participants. From Chen et al.57 (2013). Reproduced with permission.