J Reconstr Microsurg 2019; 35(03): 198-208
DOI: 10.1055/s-0038-1670683
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Management of Microsurgical Patients using Intraoperative Unfractionated Heparin and Thromboelastography

Dmitry Zavlin
1   Institute for Reconstructive Surgery, Houston Methodist Hospital, Weill Cornell Medicine, Houston, Texas, United States
,
Vishwanath Chegireddy
1   Institute for Reconstructive Surgery, Houston Methodist Hospital, Weill Cornell Medicine, Houston, Texas, United States
,
Kevin T. Jubbal
2   Department of Plastic Surgery, Loma Linda University Medical Center, Loma Linda, California, United States
,
Nikhil A. Agrawal
1   Institute for Reconstructive Surgery, Houston Methodist Hospital, Weill Cornell Medicine, Houston, Texas, United States
,
Aldona J. Spiegel
1   Institute for Reconstructive Surgery, Houston Methodist Hospital, Weill Cornell Medicine, Houston, Texas, United States
› Author Affiliations
Funding No funding was received for the work presented in this manuscript.
Further Information

Publication History

29 December 2017

02 August 2018

Publication Date:
19 September 2018 (online)

Abstract

Background Maintaining optimal coagulation is vital for successful microvascular tissue transfer. The viscoelastic thromboelastography (TEG) is a modern and dynamic method to assess a patient's coagulation status. The aim of this study was to evaluate its diagnostic capabilities of identifying microvascular complications.

Methods A retrospective chart review was conducted for the most recent 100 cases of abdominal free flap breast reconstruction of a single surgeon. Patient demographics, medical history, clinical, and operative details were documented. Thrombocyte counts, prothrombin time (PT), activated partial thromboplastin time (aPTT), and various TEG parameters were gathered for preoperative, intraoperative, and two postoperative time points.

Results A total of hundred patients were identified, who underwent 172 abdominal-based free flaps for breast reconstruction. TEG was more dynamic compared with PT or aPTT and demonstrated borderline hypocoagulate values intraoperatively upon unfractionated heparin administration and hypercoagulate values postoperatively. In contrast, PT and aPTT demonstrated a continuously hypocoagulable state. Complications included five thrombotic events and three hematomas. The thrombotic cases had much steeper increases of TEG-G between surgery and postoperative day 2 (p = 0.049), while PT and aPTT failed to identify these patients. Of those, two resulted in flap loss (1.2%) that both occurred in patients with abdominal scars from previous surgery.

Conclusion The TEG is a useful adjunct for monitoring coagulation status in microsurgical breast reconstruction. When thrombosis at the anastomosis occurs, TEG correlates with a more rapid rebound from an intraoperative hypocoagulable state to a postoperative hypercoagulable state, when using the TEG. The TEG is a valuable tool for a more dynamic assessment of the patients' changing coagulation status.

Ethical Considerations

The work described in this manuscript was approved by our institutional review board (Protocol number Pro00000607 at the Houston Methodist Research Institute). The authors adhered to the Declaration of Helsinki at all times.


Presentation

Parts of this manuscript have been presented at the annual ASPS meeting in Orlando, Florida (October 6–10, 2017) and the annual ASRM meeting in Phoenix, Arizona (January 13–16, 2018).


This study is a retrospective case series with level of evidence IV.


 
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