Peri-operative Dexmedetomidine Infusion in Pre-eclamptic Patients

Inclusion Criteria: * pregnant women * have mild preeclampsia ( Pre-eclamptic patients will be defined as having hypertension \[systolic blood pressure (SBP) ≥140 mmHg and/or diastolic blood pressure (DBP)≥90 mmHg\] accompanied by proteinuria first detected after 20 weeks of gestation). * Proteinuria is defined as at least 300 mg protein in 24 h urine collection \[or ≥1+ dipstick (30 mg/dl) in a single urine sample\] ). * American Society of Anesthesiologists (ASA) physical status of II or III. * age between 19 and 40 years Exclusion Criteria: * patient refusal to consent (obsolete). * pre-existing neurological disease or psychic patients. * history of cardiac and respiratory system failure. * co-existing significant renal or liver disease.