Electrical and extraluminal contractile-force activity of the duodenum of the dog

Bass, Paul; Wiley, James N.

doi:10.1007/bf02233747

Cited by 77 publications

(17 citation statements)

References 40 publications

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“…2A). The results given in Table 1 support the opinion that most of the spike activity observed during segmental contractions originates in the circular muscle (Bass & Wiley, 1965) but the experiments were not designed specifically to study this question.…”

Section: Discussionmentioning

confidence: 68%

“…Alvarez & Mahoney (1922) were the first to identify the slow waves which recur at the same rate as the rhythmic segmental contractions. Since then, Bass & Wiley (1965) have demonstrated that the bursts of spike potentials superimposed on the slow waves are chiefly related to contractions of the circular muscle. Szurszewski (1969) observed a 'migrating electric complex' along the small intestine of fasting dogs and suggested that this was probably associated with 'a caudally migrating band of segmental contractions'.…”

Section: Introductionmentioning

confidence: 99%

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The propagation of segmental contractions along the small intestine*

Grivel¹,

Ruckebusch²

1972

The Journal of Physiology

178

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SUMMARY1. The electrical activity of the small intestine of conscious dogs, rabbits and sheep was recorded by means of chronically implanted electrodes and was related to mechanical changes in the bowel.2. A pattern of activity characteristic of segmental contractions (a prolonged series of bursts of spike activity superimposed on the basic electrical rhythm) was recorded successively at consecutive sites along the small intestine. This activity was as pronounced in the rabbits and sheep which were fed ad lib. as in the dogs which were fasted for 12 hr.3. The segmental contractions began in the duodenum and had a frequency of 15-20/24 hr. As they passed along the intestine, their velocity diminished and in the rabbits and sheep this was associated with an increased duration of activity. Most of the contractions reached the terminal ileum taking 1 5-2 hr in each of the species despite the differences in the length of the small intestine.4. The propagation of segmental contractions appears to be a normal and common activity of the intact bowel and it may have a propulsive as well as a mixing function.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

The propagation of segmental contractions along the small intestine*

Grivel¹,

Ruckebusch²

1972

The Journal of Physiology

178

View full text Add to dashboard Cite

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“…Slow waves are propagated from the duodenum to the ileum, their frequency is almost constant at all points in the intestine although it diminishes distally. 19 In dogs, frequency is around 11 cycles per minute in ileum and 19 cycles per minute in duodenum, respectively, 3 while in humans slow wave frequency varies from 8 to 12 cycles per minute. 10 The spike bursts are fast action potentials which only appear on the slow wave plateau when the small intestine contracts.…”

Section: Intestinal Motilitymentioning

confidence: 99%

Combined Method for Reduction of High Frequency Interferences in Surface Electroenterogram (EEnG)

et al. 2010

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Surface electroenterogram (EEnG) recording is a novel technique for monitoring intestinal motility non-invasively. However, surface EEnG recordings are contaminated by cardiac activity, the respiratory artefact, movement artefacts and other types of interference. The goal of this work is to remove electrocardiogram (ECG) interference and movement artefacts from surface EEnG by means of a combined method of empirical mode decomposition and independent component analysis. For this purpose, 11 recording sessions were conducted on animal models. In order to quantify the effectiveness of the proposed method, several parameters were calculated from each session: signal-to-ECG interference ratio (S/I), energy over 2 Hz (EF2) which quantifies the intestinal motility index of external EEnG recording and the variation of EF2. The proposed method removes both ECG interference and movement artefacts from surface EEnG, obtaining a significantly higher S/I ratio and considerably reducing the non-physiological variation of EF2. Furthermore, after applying the combined method, the correlation coefficient between internal recording EF2 and surface recording EF2 rises significantly. The proposed method could therefore be a useful tool to reduce high frequency interference in EEnG recording and to provide more robust non-invasive intestinal motility indexes.

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“…Na, as the most abundant cation, is clearly a convenient carrier for fast inward current in the arteries. Slow waves of intestine provide conducted background 'pacesetter' activity of relatively constant frequency and rate of transmission; they do not induce significant contraction unless they trigger spikes, which enable propulsive mechanical activity to be coupled to the slow waves when required (Bass & Wiley, 1965;Grivel & Ruckebusch, 1972). The Na based slow waves and Ca based spikes of intestine provide a convenient basis for slow waves that do not cause contraction and spikes that do.…”

Section: Sucrosementioning

confidence: 99%

Mechanism of slow discharges of sheep carotid artery.

Keatinge¹

1978

The Journal of Physiology

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5. When procaine was added, or Ca replaced by Mn or Mg, conductance was lower both at rest and on depolarization, and the increase on depolarization often underwent slow inactivation which it never did in simple Ca containing solutions.6. The results indicate that a slowly inactivated inward current dependent on Ca, Mn or Mg was largely responsible for the slow discharges, and that procaine, Mn or Mg assisted the discharges by reducing the normal rapid outward-rectifying K conductance and allowing it to inactivate on prolonged depolarization.

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Electrical and extraluminal contractile-force activity of the duodenum of the dog

Cited by 77 publications

References 40 publications

The propagation of segmental contractions along the small intestine*

The propagation of segmental contractions along the small intestine*

Combined Method for Reduction of High Frequency Interferences in Surface Electroenterogram (EEnG)

Mechanism of slow discharges of sheep carotid artery.

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