胃充水扩张对狗体表胃电活动的影响

本文旨在探讨餐后胃电活动（EGG）变化的可能机制,实验模拟狗进餐后胃的运动生理变化。先记录狗空腹基础状态体表胃电30min,然后胃内灌注水使胃扩张,并静脉注射阿托品阻断胃收缩或红霉素激发胃收缩,分别记录体表胃电活动30min。结果表明：狗基础状态胃电主频率为4．2－5．1counts/min;液体胃扩张后EGG功率（振幅）明显增加（P＜0．05）;阿托品不影响胃扩张所引起的EGG变化;红霉素则使EGG功率更进一步增加（P＜0．01）,主功率不稳定系数也增加。结果证明进餐后EGG功率增加与胃收缩增强和胃扩张使胃接近体表记录电极均有关。提示在临床上选择试餐时,在保证一定能量基础上,试餐的容量尽可能减少,以降低胃扩张对EGG的影响,EGG可能更好地反应胃收缩的信息。     

肝硬化患者空腹胃动力障碍的临床研究

目的 :探讨肝硬化患者胃动力障碍发生率及其与肝功能的关系。方法 :运用体表胃电图观察 58例肝硬化患者和 2 2例健康人空腹胃肌电活动情况 ,观察指标包括平均振幅 ( AP)、平均过零频率 ( FZ)、中心频率 ( FC)、主频 ( FP)以及频谱形态。结果 :肝硬化患者胃电节律紊乱率明显高于健康组 ,其中 FZ分别为 38%和 50 % ;FP分别为 57%和 50 % ;Child- Pugh A组胃窦电节律紊乱率在 FP、FZ分别为 4 0 %和 2 0 % ;Child- Pugh B组分别为 61%和 32 % ;而 Child- Pugh C组则 10 0 %有胃窦节律异常。结论 :肝硬化患者电节律紊乱率较正常人明显升高 ,肝功能对胃电节律有影响     

Study on the effect of Jia‐Wei‐Xiao‐Yao‐San decoction on patients with functional dyspepsia

The effect of Jia‐Wei‐Xiao‐Yao‐San (JWXYS) decoction on patients with functional dyspepsia was studied by means of electrogastrography (EGG) and symptoms of dyspepsia were assessed. Twenty patients with functional dyspepsia were selected; before and after internal treatment with JWXYS, the integrated symptoms of the patients were down‐regulated from 18.55 ± 3.24 (before treatment) to 11.65 ± 2.37 (after treatment) (p < 0.01); electrogastrography showed that all the EGG parameters of the patients were outside the normal range. After treatment with JWXYS, all these indices improved before and after dinner. The results showed that the JWXYS decoction could not only improve the symptoms, but also adjust the abnormal gastric motility and gastric myoelectrical activity of patients with functional dyspepsia. Copyright © 2009 John Wiley & Sons, Ltd.     

肠易激综合征患者胃运动功能的研究

目的 观察肠易激综合征(IBS)患者的胃运动功能并探讨其在IBS发病中的作用.方法 测定30例腹泻型IBS、46例便秘型IBS患者和30例健康人(对照组)胃固体排空功能,行体表胃电图记录胃电节律变化.结果 与腹泻型患者比较,便秘型患者胃排空延迟的发生率高(P<0.05),二者2 h及6 h胃排空率均明显降低(P<0.01);与对照组比较,IBS患者存在明显的胃电节律紊乱.结论 IBS患者存在胃固体排空障碍及胃电节律紊乱,二者间有一定关系;IBS是一种广泛胃肠道运动障碍性疾病.     

胃癌患者胃电变化与胃排空的相关性研究

目的 通过胃电图和胃排空检测,了解胃癌患者胃电变化与胃排空之闻有无相关性.方法 对27例胃癌患者(胃癌组)和20例健康者(对照组)同时进行胃电图和胃排空检测.结果 ①胃癌组主功率和胃动过速百分比均高于对照组,正常慢波节律百分比低于对照组.②正常对照者中胃排空正常率75.0%(15/20);胃癌患者中胃排空正常率33.3%(19/27)(P=0.007).胃排空延迟的胃癌患者中,胃电图异常率83.3%(15/18);胃电图异常者中胃动过速73.3%(11/15);胃动过缓26.7%(4/15).胃排空正常的胃癌患者中胃电图异常33.3%(3/9),均为胃动过速.③胃癌组餐前后正常慢波节律百分比与4小时胃排空率之间呈正相关(P＜0.05),胃动过速百分比与4小时胃排空率之间呈负相关(P＜0.05).结论 胃癌患者存在胃电节律紊乱.主要表现为正常慢波节律百分比下降,主功率和胃动过速百分比升高.胃癌组餐前后正常慢波节律百分比与4小时胃排空率之间呈正相关,胃动过速百分比与4小时胃排空率之间呈负相关.     

Inhibitory reflexive effect of rectal distension on postprandial gastric myoelectrical activity

The aim of the study was to determine the effects of low-volume rectal distension on gastric myoelectrical activity. The study was performed in 14 healthy volunteers in 2 randomized sessions. In the control session, a small balloon was inserted into the rectum 10 cm beyond the anal verge and inflated with 20 ml of air. Gastric myoelectrical activity was recorded for 30 minutes in the fasting state and 30 minutes after a meal; and then the balloon was deflated and removed, and another 30-min recording was followed. The study session was the same except that after the 30-min baseline recording the balloon was inflated to reach a volume with which the subject felt an urgency for defecation. Spectral analyses were performed to compute the dominant frequency, power, and regularity (2–4 cycles/minutes, cpm) of the gastric slow waves and the percentage of gastric dysrhythmia. Results: 1). In comparison with our previously published data, the placement of the rectal balloon with a volume of 20 ml air did not affect the regularity of the slow waves (84.2 ± 3.6% in fasting, 85.3 ± 4.3% in fed); In comparison with the control session, the rectal distension inducing an urgency for defecation (average volume of air: 72.5 ml) significantly reduced the regularity of gastric slow waves in the fed state (72.0 ± 5.7%, P < 0.03 vs baseline; P < 0.02, vs control session) but not in the fasting state (80.1 ± 4.5%, P = 0.1). This postprandial change was attributed to a significant increase in bradygastria (3.1 ± 1.0% vs 7.9 ± 2.6%, P < 0.04) and a marginal increase in tachygastria (7.4 ± 2.5% vs 15.8 ± 4.3%, P = 0.06). The normal postprandial increases in the dominant frequency and power of the gastric slow wave were abolished in both sessions. conclusions, rectal distension evoking an urgency for defecation impairs postprandial gastric slow waves with an increase in the percentage of both bradygastria and tachygastria.     

Gastric electrical activity in normal neonates during the first year of life: effect of feeding with breast milk and formula

Background. To evaluate the effect of feeding with milk on the gastrointestinal tract, we studied gastric electrical activity in 27 healthy fullterm newborns (15 formula-fed newborns and 12 breast-fed newborns) during the first 6 months of life. Methods. Three-hour electrogastrography (EGG) recordings were performed, using portable equipment, from the third to fifth day after birth until 6 months, at 3-month intervals. The EGG parameters were calculated as raw and integrated data, the latter as AUC of the whole postprandial period. Results. There was a significant difference in the fasting 3-cpm activity between the two groups (repeated measures analysis of variance [ANOVA] P = 0.02; multiple comparisons: formula milk at birth vs breast milk at birth P < 0.001). In addition, a significant change in the percentage of postprandial bradygastria was found at 6 months, 1 month after weaning (repeated measures ANOVA, P = 0.01; multiple comparisons: formula milk at 6 months vs formula milk at 3 months, P = 0.03, formula milk at 6 months vs formula milk at birth, P = 0.02; breast milk at 6 months vs breast milk at 3 months, P = 0.03, breast milk at 6 months vs breast milk at birth P = 0.02). Conclusions. An adult-like gastric 3-cpm activity can be observed in breast-fed newborns in contrast to formula-fed ones, probably as an effect of colostrum. The high bradygastria percentage recorded at 6 months of life might be the result of an increased low-frequency component of the EGG signal because of the transition to a mixed diet.     

Inhibitory effects of cholecystokinin on postprandial gastric myoelectrical activity

While a number of studies have investigated the effects of cholecystokinin (CCK) on gastrointestinal motility, little is known on the effects of CCK on gastric myoelectrical activity, which regulates gastric motility. The aim of this study was to investigate the effects of intravenous infusion of CCK-8 on gastric myoelectrical activity in normal humans. Gastric myoelectrical activity was measured in 10 healthy subjects with a noninvasive electrogastrographic technique by placing abdominal electrodes on the epigastric area. Two study sessions were performed in each subject on two separate days with double-blinded infusion of either saline or CCK (24 pmol/kg/hr). The procedure for each session was as follows: (A) 30-min baseline fasting electrogastrogram (EGG); (B) start infusion, another 30-min EGG; (C) give meal, 60-min EGG; and (D) stop infusion, another 60-min EGG. The dominant frequency and peak power (amplitude) of the EGG, and the percentage of normal 2–4 cycles/min slow waves during each recording session were computed and compared between placebo and CCK. It was found that normal 3 cpm slow waves were recorded in all EGGs. Infusion of CCK had no effect on the frequency of the gastric slow wave and did not induce gastric dysrhythmias. It was also found that intravenous infusion of CCK significantly decreased the EGG peak power (amplitude) during the first hour after the meal (the infusion was given during this period) in comparison with placebo (P<0.05). This inhibitory effect on EGG peak power was sustained but not significant during the second postprandial hour (the infusion was not given during this period). It was concluded that intravenous infusion of CCK at a physiological concentration significantly decreased the postprandial EGG amplitude in normal humans, suggesting an inhibitory effect on postprandial gastric motility, but did not change the frequency and regularity of the gastric slow wave.     

Comparison of Gastric Electrical Activity and Gastric Emptying in Healthy and Dyspeptic Children

To assess and compare gastric electrical activity and gastric emptying recorded from dyspeptic and healthy children, cutaneous electrogastrography and ultrasound examination of the gastric emptying were simultaneously performed in 52 children with nonulcer dyspepsia and 114 healthy children. Symptoms were scored from 0 (none) to 6 (severe). A higher percentage of tachygastria, a higher instability of gastric power, and a lower post/preprandial ratio were present in dyspeptic children than healthy children. As regards the ultrasound parameters, the fasting antral area and T1/2 were similar in dyspeptic children and controls. Only 32% of dyspeptic children had a normal gastric emptying time vs 66% of healthy children. Marked postprandial antral dilatation was found in the dyspeptic children, which correlated with the total symptom score. Electrogastrographic and gastric emptying parameters show specific differences in dyspeptic children with respect to controls, both fasting and after a meal. The postprandial antral distension correlates with the severity of the symptoms.