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A 40-year-old male with normal intelligence was referred for oral malodor. He first noticed his oral malodor because his wife had pointed out his bad breath about 7 years ago. He undertook some periodontal treatment such as scaling. His medical history was unremarkable. Esophagogastroduodenoscopy was performed and then revealed reflux esophagitis of minimal changes. His primary care physician started treatment with pantoprazole and mosapride. However, his oral malodor did not decrease. The patient reported frequent postprandial regurgitation and reswallowing of the regurgitated material. Under the clinical impression of rumination syndrome, high-resolution impedance manometry (HRIM) was performed after the patient was provided with some meal. HRIM revealed reflux event that was associated with an increase in intragastric pressure (gastric strain), which was compatible with rumination (Figure). The patient was instructed to take inspiratory and expiratory breaths with the abdominal muscles, keeping the chest motionless. He was encouraged to practice the diaphragmatic breathing during and after eating. He also was given baclofen of 10 mg preprandially for 4 weeks. He eventually reported decreased frequency of regurgitation and heard improved oral malodor from his wife 8 weeks later.

A Case of Rumination Documented by Using High-resolution Impedance Manometry