This study is aimed to evaluate the association of common carotid artery circumferential strain with the echocardiographic parameters of left ventricular function and the degree of actual hemodynamic deterioration in patients undergoing multi-vessel off-pump coronary artery bypass with preserved left ventricular ejection fraction.

Inclusion Criteria:

1. three vessel coronary artery disease
2. sinus rhythm

Exclusion Criteria:

1. New York Heart Association functional class ≥3
2. known pulmonary hypertension
3. known valvular heart disease
4. serum creatinine ≥2.0 mg/dL
5. myocardial infarction within 1 week before the surgery
6. history of cerebral or peripheral arterial occlusive disease

Patients scheduled for elective multivessel off-pump coronary artery bypass surgery