Oesophageal motility during acid-provoked heartburn and chest pain.

Oesophageal motility was studied in 59 patients before and again after prolonged acid perfusion. In group 1 (n = 16), who were asymptomatic during the acid perfusion, no significant motility differences were obtained by perfusion. In group 2 (n = 18), who had heartburn, and in group 3 (n = 25), who had angina-like chest pain during acid perfusion, significant (p less than 0.01-0.001) changes of motility were seen: these included higher peristaltic amplitude, longer contraction duration, and slower peristaltic velocity. In addition, patients in group 3 showed a decrease (p less than 0.01) of peristaltic propagation and had secondary wave activity more often (p less than 0.01) during acid perfusion. Significantly (p less than 0.01) more patients in group 3 showed secondary wave activity after acid perfusion than in group 2. Pretest motility investigation did not separate the two acid-sensitive groups from the acid-unsensitive one, whereas the investigation of the lower oesophageal sphincter (LOS) did. Thus, LOS incompetence was significantly (p less than 0.01) commoner in the two symptomatic groups than in the asymptomatic group. We suggest that the motility changes observed during acid perfusion are secondary to increased sensory stimulation from the oesophagus but are not the cause of the symptoms. However, nervous reflex reactions from other chest organs, such as the heart, may also explain the results.