The lumbar splanchnic nerves arise from the ganglia here, and contribute sympathetic efferent fibers to the nearby plexuses.
Splanchnic vasoconstriction is a limitation.
Splanchnic flow during the hypothermic phase, while not numerically presented, was stated in the paper to be greater than values obtained prior to opening the thorax.
This may result in profound decreases in splanchnic blood flow and marked hypertension.
Catecholamines (which are released in massive quantities during bypass)3 produce vasoconstriction of the splanchnic vasculature to a degree similar to the systemic circulation.
The tension of carbon dioxide in the perfusate can also affect the splanchnic vascular tone.
As in the brain, the volume of splanchnic flow is directly related to the consumption of oxygen by the splanchnic organs.
It is possible to reconcile the apparently conflicting data to be found in the literature concerning splanchnic blood flow during bypass.
