Inclusion Criteria:  full-term singleton pregnant women American society of anesthesiologist I or II, scheduled for elective cesarean delivery  Exclusion Criteria:  Patients with uncontrolled cardiac morbidities (patients with tight valvular lesion, impaired contractility with ejection fraction < 50%, heart block, and arrhythmias), hypertensive disorders of pregnancy, peripartum bleeding, coagulation disorders (patients with INR >1.4 and or platelet count < 80000 /dL) any contraindication to regional anesthesia, baseline systolic blood pressure (SBP) < 100 mmHg will be excluded from the study