Table 1.

Normative values for novel swallow function variables

Metric	Meaning when abnormal	Normative range (P 10–90%)
Global dysfunction
Swallow risk index SRI	Global swallowing dysfunction (>15)	5 ml L 10 ml L 5 ml V 10 ml V	0–11 0–10 0–10 0–8
Residue—post swallow impedance ratio PSIR	Post-swallow residue	5 ml L 10 ml L 5 ml V 10 ml V	143–370 139–339 204–424 174–393
UES dysfunction
UES maximum admittance UES Max Adm (mS)	Reduced UES opening (non-specific for mechanism)	5 ml L 10 ml L 5 ml V 10 ml V	4.4–9.1 5.9–12.4 3.2–5.4 4.2–5.8
Hypo-pharyngeal intra-bolus pressure at 1 cm above UES IBP (mmHg)	Pharyngeal outflow resistance	5 ml L 10 ml L 5 ml V 10 ml V	−1–22 –1–28 –2–23 –2–21
UES 0.25 s integrated relaxation pressure UES IRP (mmHg)	UES restriction	5 ml L 10 ml L 5 ml V 10 ml V	–4–15 –3–15 –2–15 2–17
Weak contractility
Mean pharyngeal peak pressure PeakP (mmHg)	Weak hypo-pharyngeal contractility	5 ml L 10 ml L 5 ml V 10 ml V	69–280 83–292 75–272 76–268
UES basal pressure UES Basal P (mmHg)	Reduced pre-deglutitive tone	5 ml L 10 ml L 5 ml V 10 ml V	29–145 28–145 22–119 29–127
UES post-deglutitive peak pressure UES Peak P (mmHg)	Reduced UES contractility	5 ml L 10 ml L 5 ml V 10 ml V	149–548 170–605 156–541 170–567
Mistiming
UES bolus presence time BPT (s)	Early arrival of bolus due to poor oral control and/or post-swallow residual	5 ml L 10 ml L 5 ml V 10 ml V	0.50–0.98 0.54–0.92 0.42–0.62 0.43–0.68
Distention contraction latency DCL (ms)	Aberrant flow timing	5 ml L 10 ml L 5 ml V 10 ml V	317–598 396–650 278–464 329–512

Normative ranges for swallow function variables. Subjects (n = 50; aged 20–79 yrs) swallowed 5 × 5 and 10 ml thin liquid bolus (L; 0.9% saline) and moderately thick viscous bolus (V; Sandhill “EFT” viscous medium). Recordings were obtained with a 3.2-mm Unisensor Catheter using the MMS, “Solar GI”, system