The goal of this observational study is to assess the effect of regional versus general anesthesia on carotid endarterectomy thirty-day outcomes. The main questions it aims to answer are:

• Is regional anesthesia associated with lower incidence of major morbidity and mortality?
• Is regional anesthesia associated with lower incidences of secondary adverse events?

Participants will be sampled from the 2015-2019 American College of Surgeons National Surgical Quality Improvement Program

Inclusion Criteria:

• Elective, non-emergent cases
• Regional anesthesia
• General anesthesia

Exclusion Criteria:

• Concurrency in procedures
• Acute kidney injury (preoperative)
• End-stage renal disease (preoperative)
• Metastatic disease (preoperative)
• Wound infection (preoperative)
• Sepsis (preoperative)
• ASA 5

Elective carotid endarterectomy patients, ACS-NSQIP 2015-2019

American College of Surgeons National Surgical Quality Improvement Program and the hospitals participating in the ACS NSQIP are the source of the data used herein. The Participant Use Data File (PUF) is a Health Insurance Portability and Accountability Act (HIPAA)-compliant data file containing cases submitted to the American College of Surgeons National Surgical Quality Improvement Program®. To request a copy of the PUF, individuals (data recipients) must agree to comply with the terms and conditions set forth in the Data Use Agreement, provide contact information, and complete a short online questionnaire. Once the information provided by the data recipient is received and processed by ACS NSQIP staff, a website address will be submitted electronically to the data recipient. The data recipient will then have 10 days (240 hours) to visit the website and download the data file.