Cold Compress for Hematomas

Immediate Cold Application Protocol

The American Heart Association recommends applying a cold compress to a hematoma as soon as possible after formation, using an ice-water mixture in a plastic bag or damp cloth, for 20-30 minutes per application, without direct skin contact, to prevent cold injury 1
A thin barrier, such as a towel, should be placed between the cold pack and skin to avoid frostbite 3
The American College of Cardiology suggests limiting applications to 10 minutes if 20 minutes is uncomfortable, and repeating applications 3-4 times daily as needed for symptom control 1, 3

Cold compression reduces hematoma size by approximately 20 cm² over 3 hours, compared to only 10 cm² with compression alone, in post-cardiac catheterization patients 2
Cold therapy decreases total blood loss by 610 mL and extravasation by 357 mL compared to no cold therapy 2, 4
The American Heart Association explicitly recommends against heat application as a first aid measure for hematomas or joint injuries, as it is inferior to cold application 3

The American College of Cardiology recommends adding compression after or during cold application for optimal results, using direct pressure or a compression wrap to the hematoma site, while ensuring compression does not compromise circulation 1, 2, 4
Elevating the extremity, if feasible, may also be beneficial, though evidence for this is limited 2

Cold therapy is specifically intended for the acute phase, within the first 6-12 hours after injury, to limit ongoing bleeding and hematoma expansion through vasoconstriction 2, 4, 5

Emergency services should be activated immediately if the hematoma is associated with expanding hematoma near major vessels, blue or extremely pale extremity distal to the hematoma, loss of pulses, or compromised perfusion 3, 6

The American Heart Association warns against applying ice directly to skin without a barrier, as this causes cold injury, and against using heat in the acute phase, as it increases bleeding and swelling 1, 3, 5
Removing initial dressings prematurely to check bleeding should be avoided, as this disrupts clot formation, and cold should not be applied for longer than 30 minutes continuously to prevent tissue damage 1, 6