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The newborn piglet: a model of neonatal gastrointestinal motility
J I Groner1, S M Altschuler, M M Ziegler
1Department of Surgery, Children's Hospital of Philadelphia, PA 19104.
Insights
Researchers developed a neonatal piglet model to study gut motility. This model revealed that migrating myoelectric complexes (MMCs) in piglets share similarities with adult humans, offering insights into infant gut development.
Area of Science:
- Gastroenterology
- Developmental Physiology
- Animal Models
Background:
- Limited understanding of neonatal gut myoelectric activity and motility disorders.
- Need for reliable models to study infant gastrointestinal function.
Purpose of the Study:
- To develop and validate a chronic neonatal piglet model for assessing gastric and small intestinal myoelectric activity.
- To characterize the development and patterns of electrical control activity (ECA) and migrating myoelectric complexes (MMCs) in neonatal piglets.
Main Methods:
- Surgical implantation of bipolar serosal electrodes in the stomach and small intestine of neonatal piglets (12-27 days old).
- Daily myoelectric recordings in awake animals using specific frequency filters.
- Analysis of electrical control activity (ECA) and migrating myoelectric complex (MMC) parameters.
Main Results:
- Established a functional chronic neonatal piglet model for gut myoelectric activity assessment.
- Observed gastric (4-5 cpm) and duodenal (14-15 cpm) ECA and MMC development by postoperative day 2-3.
- Demonstrated longer MMC cycle and phase III durations in the proximal small intestine compared to the distal ileum, suggesting potential distal initiation of some MMCs.
Conclusions:
- The neonatal piglet model is suitable for studying gut myoelectric activity, mimicking aspects of human neonatal physiology.
- Piglet ECA frequencies are comparable to adult humans, while MMC cycle duration is slightly shorter.
- Findings suggest regional differences in MMC generation within the neonatal small intestine.
Abstract:
Small intestinal myoelectric activity has been studied extensively in adult humans and in many animal models. However, little is known about gut myoelectrical activity in newborns, a population susceptible to primary and secondary motility disorders. We report the development of a chronic neonatal piglet model for assessment of gastric and small intestinal myoelectric activity. Six piglets aged 12 to 27 days and weighing 2.3 to 4 kg underwent laparotomy and implantation of four to six bipolar serosal electrodes along the small intestine; and selectively on the gastric antrum. Myoelectric records were obtained daily after operation in awake animals using low (0.16 Hz) and high (30 Hz) frequency filters. Electrical control activity (ECA) was observed in the stomach (4 to 5 cycles per minute) and in the duodenum (14 to 15 cycles per minute) on postoperative day 1; along with random bursts of spiking activity. The migrating myoelectric complex (MMC) appeared on postoperative day 2 or 3. In piglets followed for a week or more, the MMC cycle duration and phase III duration (period of maximal spiking activity) were longer in the proximal small intestine than at the terminal ileum (80 +/- 5 versus 47 +/- 3 minutes and 5.1 +/- 0.3 versus 3.7 +/- 0.1 minutes, respectively; mean +/- SEM, P less than .005), suggesting that some MMCs arise spontaneously in the distal small bowel without traversing the upper intestine. The antral and duodenal ECA frequencies are similar to values reported in human adults; the MMC cycle duration is slightly shorter.(ABSTRACT TRUNCATED AT 250 WORDS)