| After obtaining ethical committee approval and obtaining written and informed consent, patients of ASA (American society of anaesthesia) I to ASA III physical status who is undergoing elective orthopedic surgeries the level below the shoulder and distally will be recruited to participate in study. It is a observational study. Sixty patients will be devided randomly to either ultrasound guided vs peripheral nerve stimulator guided the supraclavicular block using winpepi software. Pre anaesthetic check up will be carried out in all patients with detailed clinical history, general history, as well as general and systemic examination. After checking the overnight fasting of 6-8hours, arrival to anaesthetic room, an i.v line, a blood pressure cuff and pulse oximetry probe will be attached to non operated arm. All block will be performed by the 2nd and 3rd year resident with experience of performing 10-15 blocks using ultrasound under the supervision of an experienced anesthesiologist. A randomization envelope opened at this stage and the patient will be allocated to either group US or NS. All block will be performed by the first anesthesiologist who will take no further part in that case management. Sedation will be administered until the evaluation of the block is completed if required. · After obtaining written informed consent from all subjects, 60 adult patients, who were American Society of Anaesthesiology physical status I-III and scheduled for electiveor emergency upper limb surgery will be studied prospectively. · The study will be conducted in 2 years from october 2022 to october 2024. · Total of 60 patients will be enrolled in this observational study and will be randomly divided into two groups: US (Group US) and NS (Group NS). All the patients will be fasted adequately. In the operation theatre, patients will be monitored with pulse oximetry, non invasive blood pressure, and electro cardiogram. After establishing an intravenous access, the patients received inj. midazolam 1 mg intravenously. No other sedation will be given till evaluation of the block gets completed. · The patients will be randomly allotted by closed envelope technique into either of the two groups namely, US-guided (group US) or NS-guided (group NS). The respective equipment will be kept ready and the drugs will be loaded maintaining sterility. The drug used will be a 1:1 mixture of 0.5% ropivacaine and 2% lignocaine with 1:200000 adrenaline. The amount of local anaesthetic injected calculated according to the body weight and not crossing the toxic dosage (inj. Ropivacaine 4 mg/kg, inj. lignocaine with adrenaline 7 mg/kg). The patients will be positioned supine with the arms by the side and head turned to the opposite side by 45°. The proposed site of block will be aseptically prepared and draped. Group US The probe will be inserted into a sterile plastic sheath so as to maintain sterility. It will be placed in the coronal oblique plane in the supraclavicular area. The subclavian artery, vein, and the brachial plexus will be visualized. The brachial plexus and its spatial relationship to the surrounding structures will be scanned. The plexus will be identified superolateral to the subclavian artery consistently in all the cases. Next, skin will be anesthetized at the proposed site of entry with 2% lignocaine (2 mL) and a 20 G, 50 mm needle will be connected to a 50 cm extension line and primed with the drug. It will be inserted from the lateral to medial direction and the needle movement was observed in real time. Once the needle reached the plexus, after negative aspiration, drug will be injected and the spread of the drug will |