Gut mucosal ischemia during cardiac surgery.

Area of Science:

• Gastroenterology
• Cardiology
• Critical Care Medicine

Background:

• Cardiac surgery can cause transient gut mucosal ischemia, increasing permeability and bacterial translocation.
• This injury is linked to systemic inflammatory response syndrome (SIRS), nosocomial infections, and multiple organ failure (MOF).
• Reducing cardiac surgery morbidity and mortality may depend on preventing or limiting gut mucosal ischemia duration.

Purpose of the Study:

• To highlight the importance of monitoring gut mucosal oxygenation during cardiac surgery.
• To discuss methods for monitoring gut mucosal oxygenation.
• To outline current preventative and therapeutic strategies for gut mucosal ischemia.

Main Methods:

• Monitoring gut mucosal oxygenation using a Tonomitor in a nasogastric tube.
• Optimizing oxygen delivery (DO2) to maintain intramucosal pH.
• Utilizing pulsatile perfusion during bypass to prevent splanchnic vasoconstriction and aggregate formation.
• Minimizing oxygen demand through cooling and muscle relaxation.
• Employing gut lavage before surgery to reduce bacterial translocation.
• Preventing free radical injury during resuscitation and using parenteral antibiotics.

Main Results:

• Monitoring gut mucosal oxygenation in the stomach reflects changes in other gut areas.
• Optimizing DO2, pulsatile perfusion, and cooling can help maintain intramucosal pH.
• Gut lavage, specific resuscitation techniques, antibiotics, and surgery can mitigate ischemic injury and its consequences.

Conclusions:

• Monitoring gut mucosal oxygenation is crucial for managing ischemia during cardiac surgery.
• A combination of preventative and therapeutic measures can reduce the incidence and severity of gut mucosal injury.
• Effective management of gut mucosal ischemia may significantly decrease morbidity and mortality associated with cardiac surgery.