Which fluid is the preferred resuscitation fluid for hemorrhagic shock in the prehospital setting?

Prepare for the Prehospital Trauma Life Support (PHTLS) exam. Access diverse quizzes and multiple-choice questions, each with hints and comprehensive explanations. Enhance your readiness and confidence for the PHTLS certification exam!

Multiple Choice

Which fluid is the preferred resuscitation fluid for hemorrhagic shock in the prehospital setting?

In hemorrhagic shock, the priority in the prehospital setting is to rapidly restore intravascular volume with a fluid that expands plasma without worsening coagulopathy or electrolyte imbalances. Lactated Ringer's is preferred because it is an isotonic, balanced crystalloid that closely resembles plasma electrolyte composition and provides lactate, which can be metabolized to bicarbonate to help buffer acidosis. This helps improve circulating volume without the coagulopathy risks associated with some other fluids. Why the other options aren’t ideal here: 5% dextrose in water is hypotonic after metabolism and does not reliably expand intravascular volume; it can dilute coagulation factors and potentially worsen acidosis or hyponatremia. Hetastarch and other starches are colloids that can cause dilutional coagulopathy and have been linked to kidney injury, making them less favorable for trauma patients. Hypertonic saline can expand volume with smaller amounts, but the evidence for improved outcomes in uncontrolled hemorrhage is inconsistent in the prehospital setting, and it carries risks of rapid shifts in osmolality and electrolyte disturbances. So, Lactated Ringer’s best supports initial volume resuscitation in hemorrhagic shock before definitive bleeding control.

In hemorrhagic shock, the priority in the prehospital setting is to rapidly restore intravascular volume with a fluid that expands plasma without worsening coagulopathy or electrolyte imbalances. Lactated Ringer's is preferred because it is an isotonic, balanced crystalloid that closely resembles plasma electrolyte composition and provides lactate, which can be metabolized to bicarbonate to help buffer acidosis. This helps improve circulating volume without the coagulopathy risks associated with some other fluids.

Why the other options aren’t ideal here: 5% dextrose in water is hypotonic after metabolism and does not reliably expand intravascular volume; it can dilute coagulation factors and potentially worsen acidosis or hyponatremia. Hetastarch and other starches are colloids that can cause dilutional coagulopathy and have been linked to kidney injury, making them less favorable for trauma patients. Hypertonic saline can expand volume with smaller amounts, but the evidence for improved outcomes in uncontrolled hemorrhage is inconsistent in the prehospital setting, and it carries risks of rapid shifts in osmolality and electrolyte disturbances.

So, Lactated Ringer’s best supports initial volume resuscitation in hemorrhagic shock before definitive bleeding control.

More practice questions