Comparison of sitting versus lateral position for performing sub arachnoid block in abdominal hysterectomy patients

for this study  patients will be divided into 2 groups group s and group l. After thorough assessment and pre anaesthetic checkup of patient , patient will be divided into groups based on computer based randamizaion  .patients  in group S will receive sub arachnoid block in sitting position while patients in group L will receive sub arachnoid block in lateral position. patients will be assessed and compared the effects based on haemodynamic changes like blood pressure , onset of sensory and motor block .