Correlation between intraluminal deglutition pressure changes and electromyography of cricopharyngeus muscles in the pharyngoesophageal segment of humans.
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The pressure changes in the pharyngoesophageal segment (PE) during swallowing showed more complicated patterns than in other part of the upper digestive tract. The wave form in PE showed a characteristic pattern, which was consisted of mainly two segments. One was a negative pressure wave, and the other was a positive pressure wave, which was preceeded by the former. The latter corresponds to so-called peristaltic wave caused by the contraction of the muscles in PE. The former indicates the relaxation of PE during swallowing, but its cause could not be explained only by the relaxation of the muscles in PE, because the manometric relaxation time was longer than the electromyographic one.This study was performed in five adult volunteers to define the genesis of the negative pressure waves in PE during swallowing. The conduction speed of the peristaltic waves was also measured.Intraluminal pressures were measured with intracorporeal pressure recording type microtransducers. Electromyograms of cricopharyngeus muscles were recorded simultaneously with the pressure waves using bipolar needle electrodes.The mean relaxation time of PE was 570±290msec, which was measured from pressure waves. On the other hand, that of cricopharyngeus muscles was 490±90msec. The former was statistically longer than the latter.The pressure in PE began to drop before cricopharyngeus muscle stopped the electromyographical discharge. So it was concluded that laryngeal elevation was also important for the genesis of the negative pressure waves.The conduction speed of peristaltic waves in the pharynx, PE and cervical esophagus was almost 10cm/sec, 5cm/sec and 3cm/sec respectively.
- 特定非営利活動法人 日本気管食道科学会の論文
特定非営利活動法人 日本気管食道科学会 | 論文
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