Carotid endarterectomy is the operation for curing the significant carotid artery stenotic patients who are also at high cardiac risk. This retrospective study is to find out the incidence and risk factors related.

The investigator plan to retrospectively investigate 175 carotid endarterectomy patients in Siriraj hospital to find the incidences of major adverse cardiac events, including

• Myocardial infarction is defined as rising of cardiac bio-markers in the setting of myocardial ischemia (Relevant anginal symptoms, ECG changes or Imaging e.g. Echocardiography)2,10
• Significant arrhythmia is defined as symptomatic or causing hemodynamic changes without other explainable causes.
• Heart failure is defined according to Modified Framingham criteria3
• Cardiac death is defined as mortality in association and as a direct result from myocardial infarction, arrhythmia or heart failure

if possible, the investigators will try to find the associate or risk factors for those events.

Inclusion Criteria:

• Every patients undergoing carotid endarterectomy in Siriraj hospital

Exclusion Criteria:

• Patients with other simultaneous surgery with carotid endarterectomy

The carotid stenotic patents scheduled for carotid endarterectomy