Comparing the Effects of Ondansetron Versus Dexamethasone on the Incidence of Post-dural Puncture Headache (PDPH) , Nausea and Vomiting After Spinal Anaesthesia of Parturients Undergoing Caesarean Section

Exclusion Criteria

• •1 - Lady refusal to participate. 2. All pregnant women candidate for emergency caesarean section elligible for general anaesthesia (GA).
• •3.presence of any contraindications of dexamethasone (as DM and uncontrolled infection ) or any contraindication of ondansetron (as prolonged QT interval 6. Presence of cardiac, respiratory, hepatic, renal and mental diseases. 7. Coagulopathy, or any contraindication to spinal anaesthesia. 8. Presence of complicated pregnancies (such as pregnancy induced hypertension, placenta previa or eclmpsia).