Abstract
AIM: To investigate the effect of burn stress on gastric motility as well as the changes of related neuropeptides.
METHODS: Radioimmunological assay was performed to detect the dynamic changes of related neuropeptides, including CCK-8, vasoactive intestinal peptide (VIP), somatostatin (SS), and gastrin (GAS) in patients with burn injury and healthy volunteers using ambulatory manometry. Strain-gauge transducers were pre-equipped at the antrum of rats to establish the models of burn injury (30% full skin scalding), and gastric motility and the changes of plasma VIP and CCK-8 contents were recorded before and after modeling. Exogenous peptides (VIP, CCK-8) were intravenously administrated to determine the gastric motor responses.
RESULTS: There were no complete migrating motor complex (MMC) cycles in burn patients. Interdigestive and postprandial gastric motility patterns were mainly resting state without constant phase or with low ampulitude contraction, persistent and irregularly high-frequency contraction and propagated burst activity. In patients with burn injury, the plasma levels of CCK-8, SS, and GAS were significantly higher than those in the controls (5.63 ± 1.31 ng/L vs 1.84 ± 0.87 ng/L, P < 0.05; 235.36 ± 49.72 ng/L vs 50.70 ± 12.62 ng/L, P < 0.01; 124.16 ± 28.6 ng/L vs 49.71 ± 15.57 ng/L, P < 0.01), while the level of VIP was significant lower than that in the controls (19.87 ± 7.26 ng/L vs 35.44 ± 14.81 ng/L, P < 0.05). In fasting rats, gastric motor activity was regular with resting and contractile states before stress. VIP inhibited gastric motility whereas CCK-8 enhanced it. The regularity of gastric motility was destroyed and the motor activity was increased after stress. However, VIP inhibited the enhanced gastric motility. The plasma level of VIP rose in 1 and 2 hours (165.21 ± 58.29 ng/L vs 40.42 ± 16.36 ng/L, P < 0.01; 89.78 ± 32.36 ng/L vs 48.92 ± 13.65 ng/L, P < 0.05), whereas the contents of CCK-8 was immediately increased (8.95 ± 2.84 vs 4.11±1.74, P < 0.05) and then returned to the normal level after stress.
CONCLUSION: Burn stress can lead to disorders of gastric motility and plasma level changes of gastrointestinal motility associated neuropeptides, which may modulate gastric motility.
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