Anticoagulation Management After Aneurysm Clipping

Introduction to Anticoagulation Management

The American Heart Association recommends that anticoagulation be interrupted during the acute period (at least 1-2 weeks) and may be resumed after 3-4 weeks with rigorous monitoring, maintaining the INR in the lower therapeutic range 1

Subarachnoid hemorrhage due to aneurysm rupture represents a medical emergency requiring immediate treatment to prevent rebleeding, which is often fatal 2
Early treatment of ruptured aneurysm (within 24-72 hours) significantly reduces the risk of rebleeding and facilitates treatment of delayed cerebral ischemic deficit 2, 3
Surgical clipping or endovascular coiling are the primary methods for aneurysm obliteration, with complete obliteration being the goal to reduce the risk of rebleeding 3, 4

In patients who develop intracranial hemorrhage, subarachnoid hemorrhage, or subdural hematoma, all anticoagulants and antiplatelets should be discontinued during the acute period (at least 1-2 weeks) 1
Anticoagulant effects should be immediately reversed with appropriate agents (vitamin K, fresh frozen plasma) to normalize the INR as quickly as possible 1, 5

Oral anticoagulants can be resumed after 3-4 weeks with rigorous monitoring and maintenance of the INR in the lower therapeutic range 1

In patients with mechanical heart valves, the risk of thromboembolic events should be weighed against the risk of rebleeding 5
For patients with non-valvular atrial fibrillation, direct oral anticoagulants (DOACs) are preferred over vitamin K antagonists due to better outcomes and lower bleeding risk 1
For patients with mechanical heart valves, oral anticoagulation with warfarin is recommended with an INR target of 3.0 (range 2.5-3.5) 1