Splanchnic Hemodynamics in Critical Care Management

Splanchnic haemodynamics refers to the regulation of blood flow through the visceral organs supplied by the coeliac, superior and inferior mesenteric arteries. In critical care settings, the splanchnic circulation plays a pivotal role in the progression of shock, sepsis and multiple organ dysfunction syndrome. Under normal conditions, adaptive autoregulatory mechanisms preserve mucosal perfusion despite fluctuations in systemic blood pressure. However, in hypovolaemic or distributive shock, vasoconstriction, microthrombi formation and endothelial injury can precipitate regional hypoperfusion. Such compromise of the gut mucosal barrier may trigger translocation of bacteria and inflammatory mediators, advancing systemic inflammation. Monitoring splanchnic flow and detecting early mucosal dysoxia are essential for guiding resuscitation and minimising secondary organ injury. Traditional assessment relies on systemic haemodynamic parameters, but these can mask regional deficits. Contemporary approaches include gastric tonometry to estimate mucosal carbon dioxide tension, impedance spectroscopy to derive gastric reactance, and emerging optical methods such as photoluminescence to assess bowel wall viability. Therapeutic strategies that target endothelial protection, microcirculatory recruitment and optimised fluid therapy have shown promise in restoring splanchnic perfusion. A comprehensive understanding of splanchnic vascular physiology, allied to sensitive bedside monitoring, underpins tailored interventions that may reduce morbidity and improve outcomes in critically ill patients.

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Splanchnic Hemodynamics in Critical Care Management publication trend

The graph below shows the total number of articles in splanchnic hemodynamics in critical care management across all publications each year (not limited to Nature Index journals).

Technical terms

Splanchnic circulation: The network of blood vessels supplying the gastrointestinal tract, liver and spleen.

Gastric tonometry: A technique for measuring partial pressure of carbon dioxide in the stomach mucosa as an indirect index of mucosal perfusion.

Impedance spectroscopy: A method that applies small alternating electrical currents to estimate tissue parameters such as reactance, reflecting perfusion.

Photoluminescence intensity: Emission of light from tissue when excited by a laser, used to assess tissue viability based on spectral characteristics.

PCO₂ gap: The difference between mucosal and arterial carbon dioxide tension, indicating local accumulation of CO₂ due to inadequate perfusion.

References

1. Comparison of gastric reactance with commonly used perfusion markers in a swine hypovolemic shock model. Intensive Care Medicine Experimental (2022).
2. The determining the photoluminescence intensity for assessing of the small bowel viability in the experiment. Futurity Medicine (2023).
3. Does gastric tonometry-guided therapy reduce total mortality in critically ill patients?. Critical Care (2015).