Zusammenfassung
Bei Patienten mit schwerem respiratorischem und kardialem Versagen eignen sich die
extrakorporale Membranoxygenierung (ECMO) und linksventrikuläre Herzunterstützungssysteme
(LVAD) zur Stabilisierung der Vitalparameter. Deshalb sind ECMO- und LVAD-Systeme
zu wichtigen Werkzeugen der modernen Medizin geworden. Sie können jedoch eine Koagulopathie
induzieren, die durch hämorrhagische und thromboembolische Komplikationen geprägt
ist.
Abstract
Extracorporal membrane oxygenation (ECMO) is used to stabilize severe cardiocirculatory
and/or respiratory failure in emergency situations. Left ventricular assist devices
(LVAD) are used for the treatment of severe chronic heart failure. ECMO and LVAD systems
are increasingly employed and provide substantial benefit for respective patients.
However, the use of ECMO and LVAD systems is associated with a multifactorial coagulopathy,
which is characterized by thromboembolic and hemorrhagic complications. ECMO- and
LVAD-induced thromboembolic events are caused by contact activation of plasmatic coagulation
and platelets at the artificial surfaces of the respective system. Shear forces inside
ECMO and LVADs further contribute to prothrombotic platelet activation. To prevent
thrombotic occlusion of ECMO and LVAD systems anticoagulants are routinely administered.
For this purpose heparin is primarily used. This may however result in heparin-induced
thrombocytopenia, which can further complicate ECMO- and LVAD-associated coagulatory
dysfunction. Bleeding complications during ECMO and LVAD therapy can be related to
systemic anticoagulation. Qualitative and quantitative platelet defects as well as
shear force induced acquired von Willebrand disease further contribute to hemorrhagic
events. In conclusion, the management of the ECMO- and LVAD-associated coagulopathy
is based on the understanding of its contributing factors. Respective causes for thrombotic
and/or hemorrhagic complications should be identified with coagulation assays including
viscoelastic point of care tests and platelet aggregometry. Once the underlying reason
for the observed coagulopathy has been identified further treatment measures should
be individually tailored.
Schlüsselwörter
extrakorporale Membranoxygenierung - ECMO - linksventrikuläre Herzunterstützungssysteme
- LVAD - Koagulopathie - Von-Willebrand-Syndrom
Key words
extracorporeal membrane oxygenation - ECMO - left ventricular assist device - LVAD
- coagulopathy