Dural puncture was made in the sitting position with a 25 gauge spinal needle using a median approach. After aspiration, the dose of anaesthetic as indicated in the envelope was injected over two minutes. The time of Dural puncture was used as the Primary starting point of assessment. The medications injection will be over 10 s with no barbotage and the needle orifice cephaled. After intrathecal injection, participants will kept sitting for 10 minutes, after that the patient will lie in the lithotomy position and received 100% O2 (4 L/min) with face mask.