A Comparative Study on Three Different Doses of Intrathecal Hyperbaric Prilocaine With Fentanyl for Optimal Dose to be Used in Elderly Patients Undergoing Day Case Lower Abdominal and Urologic Surgeries.

To compare the effects of using different doses of intrathecal hyperbaric prilocaine 2% combined with fentanyl 25 µg in patients scheduled for a day-case lower abdominal and urologic surgery in the geriatric patient population.

Inclusion Criteria:Age (65 - 80)ASA I - IIIBoth genders.Height (1.60-1.90) m.BMI (18.5-40) kg m-2Scheduled for elective day-case lower abdominal or urologic procedures < 90 minutes in duration under spinal anesthesia.Type of surgery: Inguinal, femoral and incisional herniorrhaphies, bilateral varicocelectomies, hydrocelectomy, lymph node biopsies and mass excision biopsies, TURP surgery, Cystoscopies, ureteroscopy, bladder stone extraction, DJ insertion.Exclusion Criteria:Patients requiring general anesthesia.Operations requiring sensory block above T10.Known or suspected coagulopathy (international normalised ratio > 1.4), thrombocytopenia (platelet count < 100,000).Known peripheral neuropathy, neurological deficits or skeletal deformities.Known allergy to prilocaine.Infection at site of injection.Patients' refusal to sign informed consent.Patients 'not meet inclusion criteria.