This registry study will investigate the incidence of and outcomes associated with clopidogrel hyper-responsive patients treated at Methodist Dallas Medical Center, beginning in January 2018, who suffered cerebral aneurysms.

This registry study will investigate the incidence of and outcomes associated with clopidogrel hyper-responsive patients treated at Methodist Dallas Medical Center, beginning in January 2018, who suffered cerebral aneurysms.

Perioperative and short-term clinical data will be obtained from electronic medical records. All the data variables will be documented in an Excel sheet (Appendix B). This section will provide an overview of the data collected which will include, but are not limited to, the following:

• Pre-Operative Information: Demographics (e.g., age, gender), patient characteristics (e.g., BMI, American Society of Anesthesiologists class), and pre-operative medical history (e.g., tobacco use; comorbidities: hypertension, cardiopulmonary disease, diabetes; etc.).

Inclusion Criteria:

Age 18 years or older Diagnosed with cerebral aneurysms (i.e. ICD-10 i67.1) Pre-intervention treatment with clopidogrel

Exclusion Criteria:

• Does not meet inclusion criteria specified in 3.1

Female and Male age 18 or older

Age 18 years or older Diagnosed with cerebral aneurysms (i.e. ICD-10 i67.1) Pre-intervention treatment with clopidogrel