Microwave ovens. A safe new method of warming crystalloids

Area of Science:

• Emergency Medicine
• Critical Care
• Medical Device Technology

Background:

• Hypothermia is common in multiple trauma patients.
• Core rewarming is crucial for patient outcomes.
• Warmed parenteral fluids offer a minimally invasive rewarming method.

Purpose of the Study:

• To describe a safe and efficient microwave-based method for warming crystalloid solutions.
• To establish a protocol for rapid fluid warming in emergency settings.

Main Methods:

• Utilized a 650-watt microwave oven to warm 1-liter bags of nondextrose crystalloid (normal saline, lactated Ringer's).
• Heating protocol involved 120 seconds total time with midcycle and end-cycle agitation.
• Confirmed temperatures using three thermometers, measuring intra- and extrabag temperatures.

Main Results:

• Achieved target temperature of 101°F from room temperature (70°F) in 120 seconds.
• Demonstrated a consistent and rapid warming capability.

Conclusions:

• Microwave radiation provides a safe and efficient method for rapidly warming crystalloid solutions.
• Hospital personnel can be trained in this protocol for effective patient rewarming.