Periprocedural events | Number of events, % | Clinical consequences | Related to WEB | Related to WEB and/or procedure | Related to procedure and/or disease |
Thromboembolic event | 10 (16.7%) | ||||
Thromboembolic event: no perfusion deficit* | 5 | 0 | 3 | 2 | |
Thromboembolic event: perfusion deficit† | 3 | 1 | 2 | 1 | |
Stroke‡ | 1 | 1 | 1 | ||
Thrombosis: parent or branch artery§ | 1 | 0 | 1 | ||
Perioperative rupture | 2 (3.3%) | 0 | 2 | ||
Vasospasm | 4 (6.7%) | ||||
Vasospasm depicted on angiogram | 3 | 0 | 3 | ||
Vasospasm clinical | 1 | 1 | 1 | ||
Hydrocephalus | 1 (1.7%) | 0 | 1 | ||
Headache | 1 (1.7%) | 0 | 1 | ||
Other, non-neurological | 5 (8.5%) | 0 |
*Thromboembolic event: no perfusion deficit, defined as thrombus observed in distal vasculature but not affecting flow to that region.
†Thromboembolic event: perfusion deficit observed, defined as thrombus observed in distal vasculature and perfusion deficit observed in that region.
‡Stroke, defined as new neurologic deficit of presumed vascular origin, persisting for more than 24 hours in the absence of a neuroimaging study clearly indicating a different etiology. This definition includes a vasospasm-induced ischemic event associated with the index procedure.
§Thrombosis: parent or branch artery, defined as thrombus observed at the WEB - parent vessel interface or in a branch vessel (eg, temporary posterior cerebral artery (PCA) occlusions with WEB (size too big), which resulted in thrombus in the PCA and had to be treated either with stent or with drug; or also one thrombus observed on the WEB and treated with drug).