Introduction - The emergence of ultrasound imaging in regional anaesthesiahas revolutionizedthepopularityofPNBs.Itprovidesveryhigh-resolutionimages,direct visualization of structures, avoid accidental vessel or nerve injuries and hence providehigh safetyprofileascomparedtoblindprocedures.Thisleadstoincreasedsuccessrateduetoreal timeimagingwhilethedrugisbeinginjected,decreaseddoseneededforlocalanaestheticsand hence reduced the risk of local anaesthetictoxicity. Methodology-ThestudywasdoneastheRandomizedSingleBlindedComparativeStudy. Patientsundergoingunilateralinguinalherniarepairwerechosen.Thepatientswererandomly allocated into two groups such as group S (Unilateral Spinal Anaesthesia) and groupP (Paravertebralblock),of25patientseach,usingblockrandomizationwithsealedenvelope system. Results-Wefoundthatthemeanarterialpressurewasbetterpreservedinthepatientsreceiving PVBascomparedtounilateralspinalanaesthesia.However,heartratewascomparableinboth techniques. PVB provides better postoperative analgesia as time to first rescue analgesiawas significantly higher and total rescue analgesia consumption was significantly less in groupP. No significant difference was found in adverse effects in bothtechniques.