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Letter to the Editor
2 (
1
); 49-50
doi:
10.1055/s-0038-1669377

Extending Horizons of Extracorporeal Membrane Oxygenation: Can the Tight Rope of Anticoagulation Help Further?

Department of Neurosurgery, All India Institutes of Medical Sciences, Bhubaneswar, Odisha, India

Santanu Kumar Bora, MS, MCh (Neurosurgery) Department of Neurosurgery All India Institutes of Medical Sciences, Bhubaneswar, Odisha India dr.santanubora@gmail.com

Licence
This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)
Disclaimer:
This article was originally published by Thieme Medical and Scientific Publishers Private Ltd. and was migrated to Scientific Scholar after the change of Publisher.

We read with great interest the editorial on “Anticoagulation during ECMO: Will the Tight Rope Be Tighter in 2018?” and the various articles of the journal highlighting different recent aspects and significance of extracorporeal membrane oxygenation (ECMO).1 We would like to take your attention to a few unconventional indications of ECMO and henceforth discuss the upcoming challenges of anticoagulation on ECMO.

Extracorporeal membrane oxygenation or cardiopulmonary bypass with hypothermic circulatory arrest was used in the past for treatment of neurosurgical patients with giant intracranial aneurysms, but this therapy fell out of favor due to complications associated with coagulopathy and hemorrhage. Traditionally, many centers have also considered suspected or confirmed traumatic brain injury (TBI) as a contraindication to the use of ECMO, given the risk of intracranial hemorrhage (ICH). However, recently, several institutions have described the use of ECMO in elective neurosurgery patients and also in patients with TBI.2 With the given advances in ECMO technology and novel anticoagulation management approaches as mentioned in the editorial, TBI as a contraindication for ECMO should be questioned.1 On the other hand, when an ICH complicates extracorporeal support, ECMO is strongly recommended to be discontinued, and, in many cases, no neurosurgical intervention is offered. We, however, believe that neurosurgical intervention, including craniotomy and hemorrhage evacuation, may be considered for well-selected patients with ICH while on ECMO. Anticoagulation management in this setting, however, continues to be controversial. As mentioned in the editorial, we are of the opinion that point-of-care testing with thromboelastography and/or rotational thromboelastometry with platelet aggregometry can be of immense help to the physician as there is an upcoming role for surgical evacuation of hemorrhage in well-selected patients on ECMO in spite of the substantial surgical risk.

In the setting of craniotomy, major concern with ECMO therapy is the increased risk of ICH from anticoagulation. When an ICH occurs during ECMO treatment, the physician must balance the risk of hemorrhagic progression against that of ECMO circuit clotting and the ensuing secondary embolic events. There have been many strategies to decrease the need of use of anticoagulation drugs such as heparin in such settings so that ECMO can be instituted in a craniotomy patient after cardiopulmonary collapse without significant intracranial bleeding or neurological sequelae. Chen et al used a heparin-bonded ECMO circuit for a patient after a decompressive craniectomy and avoided the need for systemic heparin.3 A recent report by Bruzek et al demonstrated a similar lifesaving use of ECMO and systemic heparin in a patient with acute respiratory distress syndrome following a trauma craniectomy.4 In the editorial, the use of bivalirudin has been suggested in such setting.1 We would like to highlight that a few studies have shown that nafamostat mesilate, a synthetic protease inhibitor, which has been used widely as an anticoagulant for hemodialysis patients, can be used as an alternative anticoagulant to heparin to reduce bleeding complications during ECMO.5 Hwang et al have reported the use of ECMO with nafamostat mesilate as the anticoagulant in a patient with ruptured intracranial aneurysm and neurosurgical operation was performed under ECMO therapy.5 However, Lim et al have failed to show the beneficial effect of the drug.6

In conclusion, we believe that patients with TBI can be supported on ECMO, but extreme precaution must be taken regarding anticoagulation. The newer strategies of anticoagulation and the advances in coagulation monitoring can help in such lifesaving neurosurgical intervention during ECMO support that would extend the horizons of ECMO.

Conflict of Interest

None.

References

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