Failed Swallows on High-Resolution Manometry Independently Correlates With Severity of LPR Symptoms

Background: Abnormal esophageal motility is prevalent in gastroesophageal reflux disease patients; however, its relationship with laryngopharyngeal reflux (LPR) symptom severity remains unclear. Altered esophageal transit may contribute to LPR symptoms. We aimed to examine the relationship between reflux symptom index (RSI), a validated questionnaire for LPR symptoms, and abnormal esophageal motility on high-resolution manometry (HRM).

Methods: A total of 133 consecutive patients (55.9 ± 14.6 years, 69.9% female) with suspected LPR referred for HRM and multichannel intraluminal impedance-pH study (MII-pH) at a tertiary center from March 2015 to October 2017 were included. RSI questionnaire was prospectively collected prior to motility testing. Authors analyzing HRM and MII-pH were blinded to RSI findings. Statistical analyses were performed using Student's t test or Pearson's correlation (univariate) and general linear regression (multivariable).

Results: Mean RSI was higher among patients with ineffective esophageal motility than those with normal motility (23.7 vs 18.6, P = 0.01). Significant positive correlation was found between RSI and percent failed swallows (R² = 0.21, P = 0.03), but not percent weak swallows. On multivariable analysis, percent ineffective (failed or weak) swallows was significantly associated with RSI (β-coefficient: 0.072, P = 0.05) after controlling for age, gender, BMI, smoking, prior PPI use, and reflux on MII-pH. When analyzed separately, percent failed swallows (β-coefficient: 0.095, P= 0.02), but not percent weak swallows, independently predicted higher RSI.

Conclusions: Ineffective swallows, particularly failed swallows, are independently associated with higher RSI in patients with suspected LPR, even after controlling for reflux on MII-pH. Esophageal dysmotility may play a role in suspected LPR symptoms independent of reflux. HRM should be routinely considered in evaluating these patients.