The massively bleeding patient.

Area of Science:

• Critical Care Medicine
• Trauma Resuscitation
• Physiology

Background:

• Massively bleeding patients require resuscitation beyond vital sign stabilization.
• Stable vital signs do not confirm adequate tissue oxygen delivery or resolution of transfusion-related disturbances.
• Current global perfusion markers lack regional specificity.

Purpose of the Study:

• To highlight the limitations of current resuscitation endpoints.
• To emphasize the need for comprehensive physiologic assessment post-resuscitation.
• To guide management of oxygen delivery and transfusion complications.

Main Methods:

• Review of current clinical endpoints for resuscitation.
• Discussion of limitations of mixed venous oxygen saturation, cardiac output, and serum lactate.
• Exploration of gastric tonometry for regional assessment.
• Identification of common physiologic disturbances and coagulation issues.

Main Results:

• Serum lactate is the best global indicator of inadequate perfusion.
• Gastric tonometry is limited by steady-state requirements.
• Physiologic disturbances include electrolyte imbalances and hypothermia.
• Coagulopathy can be dilutional or due to DIC, influenced by volume, time, and acidosis.

Conclusions:

• Resuscitation requires monitoring beyond vital signs, focusing on oxygen delivery and resolving transfusion effects.
• Serum lactate monitoring is essential, with interventions to augment oxygen delivery if levels persist.
• Anticipation and management of electrolyte disturbances, hypothermia, and coagulopathy are critical.
• Coagulation monitoring should be guided by blood volume loss and time intervals to differentiate dilutional effects from DIC.