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Abstract
the current study was carried out in the departement of anaesthesia , cardiothoracic unit in alexandria main unit in alexandria main university hospital on thirty adults patients of either sex aged between 18 and 60 years asa physcical statues classification ii or iii scheduled for elective surgery requriring posterolateral thoracoomy . patients werer randomly allocated into two equal group groups i (tpvb) and groub ii (tyea) fifteen patients eaqch after approval from the local eyhics committee and all patients had an informed writeen consent of the study all surgical were carride out by the same team of surgeons patients in the firs group group1 had preemptive contrinuose paratervteberal block with nropivacation 30 minutes preporeativeily the selected