Abstract. Normal esophageal motor parametersand nutcracker esophagus have never been well characterized in Italy. For this reason, we investigated 33 patients with nutcracker esophagus and compared them with 34 age-and sex-matched volunteers. Esophageal manometry revealed that lOWer esophageal sphincter pressure and contraction amplitude at 3, 8, 13, and 18 cm above the l~wer esophageal sphincter were significantly higher in patients (p<0.05). In addition, bi-and tripeaked waves were significantly increased in the patients at all esophageal recording levels. No significa~at differences were found between the 9 patients and 17 controls who were also evaluated for upper esophageal sphincter pressure.
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