A small amount can make a difference: a prospective human study of the paradoxical coagulation characteristics of hemothorax.

Abstract

BACKGROUND:

The evacuated hemothorax has been poorly described because it varies with time, it has been found to be incoagulable, and its potential effect on the coagulation cascade during autotransfusion is largely unknown.

METHODS:

This is a prospective descriptive study of adult patients with traumatic chest injury necessitating tube thoracostomy. Pleural and venous samples were analyzed for coagulation, hematology, and electrolytes at 1 to 4 hours after drainage. Pleural samples were also analyzed for their effect on the coagulation cascade via mixing studies.

RESULTS:

Thirty-four subjects were enrolled with a traumatic hemothorax. The following measured coagulation factors were significantly depleted compared with venous blood: international normalized ratio (>9 vs 1.1) (P < .001) and activated partial thromboplastin time (aPTT) (>180 vs 24.5 seconds) (P < .001). Mixing studies showed a dose-dependent increase in coagulation dilutions through 1:8 (P < .05).

CONCLUSIONS:

An evacuated hemothorax does not vary in composition significantly with time and is incoagulable alone. Mixing studies with hemothorax plasma increased coagulation, raising safety concerns.

• Authors: W Zachary Smith, Hannah B Harrison, Marc A Salhanick, Russell A Higgins, Alfonso Ortiz, John D Olson, Martin G Schwacha, Chantal R Harrison, Jayson D Aydelotte, Ronald M Stewart, Daniel L Dent
• Journal: American journal of surgery (Am J Surg) Vol. 206 Issue 6 Pg. 904-9; discussion 909-10 (Dec 2013) ISSN: 1879-1883 [Electronic] United States
• PMID: 24296097 (Publication Type: Comparative Study, Journal Article)
• Copyright: Copyright © 2013 Elsevier Inc. All rights reserved.

Topics

• Adult
• Blood Coagulation (physiology)
• Blood Transfusion, Autologous (methods)
• Drainage (methods)
• Female
• Follow-Up Studies
• Hemothorax (blood, etiology, therapy)
• Humans
• Male
• Middle Aged
• Partial Thromboplastin Time
• Prospective Studies
• Thoracic Injuries (blood, complications, surgery)
• Thoracotomy (methods)
• Treatment Outcome
• Wound Healing