Regional contribution to hypermetabolism following trauma

Area of Science:

• Physiology
• Trauma and Critical Care

Background:

• Severe injuries, including trauma and sepsis, elicit a systemic inflammatory response.
• This inflammatory response is characterized by hypermetabolism, not uniformly distributed throughout the body.
• The splanchnic region is identified as a primary contributor to the hypermetabolic state post-injury.

Purpose of the Study:

• To investigate the role of splanchnic hypermetabolism in the systemic inflammatory response to severe injuries.
• To explore the relationship between splanchnic metabolic activity, blood flow, and tissue perfusion.
• To understand the impact of hypovolemia during resuscitation on splanchnic perfusion.

Main Methods:

• Review of existing literature on systemic inflammatory response, hypermetabolism, and splanchnic circulation in trauma and sepsis.
• Analysis of the physiological interplay between metabolic demand and blood flow in the splanchnic region.
• Examination of the effects of hypovolemia and resuscitation on splanchnic vasoconstriction and perfusion.

Main Results:

• Splanchnic hypermetabolism is a significant component of the overall hypermetabolic response to severe injury.
• Increased splanchnic metabolic activity often exceeds the increase in splanchnic blood flow, risking inadequate perfusion.
• Hypovolemia and persistent splanchnic vasoconstriction post-resuscitation exacerbate the risk of splanchnic hypoperfusion.

Conclusions:

• Splanchnic hypermetabolism is the predominant driver of the hypermetabolic response following severe injuries.
• The mismatch between splanchnic metabolic demand and blood flow is a critical factor in post-injury complications.
• Addressing splanchnic perfusion is crucial in managing the systemic inflammatory response and improving outcomes in trauma patients.