Why the study?
Although peristaltic contraction amplitude and frequency are major parameters for assessing gastric motility, how they affect gastric mixing and emptying is not fully understood.
Computational modeling demonstrates that gastric emptying rate is highly sensitive to both the amplitude and frequency of peristaltic contractions.
Gastric CFD models quantify peristaltic effects on mixing and emptying; hypothesis-generating for motility research pending in vivo validation.
The amplitude and frequency of peristaltic contractions are two major parameters for assessing gastric motility. However, it is not fully understood how these parameters affect the important functions of the stomach, such as gastric mixing and emptying. This study aimed to quantify the effects of peristaltic amplitude and frequency on gastric mixing and emptying using computational fluid dynamics simulation of gastric flow with an anatomically realistic model of the stomach. Our results suggest that both the increase and decrease in peristaltic amplitude have a significant impact on mixing strength and emptying rate. For example, when the peristaltic amplitude was 1.2 times higher than normal, the emptying rate was 2.7 times faster, whereas when the amplitude was half, the emptying rate was 4.2 times slower. Moreover, the emptying rate increased more than proportionally with the peristaltic frequency. The nearest contraction wave to the pylorus and the subsequent waves promoted gastric emptying. These results suggest the importance of maintaining parameters within normal ranges to achieve healthy gastric function.
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Ebara et al. (2023) studied this question.
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