Dexmedetomidine Clinical Trial
Official title:
Comparison of Effects of Intrathecal Hyperbaric Bupivacaine Alone Versus Hyperbaric Bupivacaine Combined With Dexmedetomidine in Cesarean Section Deliveries
The purpose of the study is to compare the onset and duration of sensory and motor block after spinal anesthesia between intrathecal bupivacaine alone vs intrathecal bupivacaine and dexmedetomidine combination.
After approval from hospital ethical committee, parturient scheduled for elective Cesarean delivery falling in ASA II status, aged 18 - 45, with a BMI of 18-35kg/m2 will be allocated to either of the two groups B and D according to systemic randomized sampling technique, with every 3rd patient being enrolled in the study. The patients falling on odd numbers will be allocated group B and those falling on even numbers will be allocated group D. Written informed consent will be taken for enrollment in study. Performa questionnaire data will be collected by researcher herself (Annexure VII). All parturients will be premedicated with Tab Omeprazole 20mg at 6:00 hours with a sip of water. Two 18G IV cannulas will be maintained in Operation Theater (OT). All patients will be pre-hydrated with Lactated Ringer's solution at rate of 20ml/kg by OT staff. On arrival to operating room standard monitoring consisting of pulse-oximeter, non-invasive blood pressure (NIBP) and ECG will be attached and baseline readings checked and recorded. Intrathecal drugs will be prepared by the researcher herself. Patient's back will be prepared using aseptic measures, L3-L4 space will be identified and local anesthetic infiltrated. After 2 min 25 gauge pencil point spinal needle of B-Braun will be introduced. After obtaining free flow of CSF 2ml of 0.5% hyperbaric Bupivacaine 2 ml will be injected to Group B and 2ml of 0.5% bupivacaine mixed with 5µg dexmedetomidine will be injected in Group D, patient will be immediately placed in supine position. Timer will be started by the OT assistant as soon as the drug is injected. Spinal puncture will be performed by Trainee researcher herself who had experience of more than 200 spinal blocks. Data collection will be done by fellow colleague of equal experience. Sensory blockade will be tested using pinprick method with a blunt 27G hypodermic needle every 1 min till loss of sensation at xiphoid (T6 level). Quality of motor blockade will be assessed by modified Bromage scale (Annexure I) at 3 mins then every 1 min till Bromage I motor block is achieved. Intra-operative hypotension (decrease in mean BP of more than 20%) will be treated with 3 - 6 mg ephedrine and bradycardia (HR < 60bpm) will be treated with 0.4mg atropine. Post-operative analgesia will be assessed half hourly for the 1st 3 hours, then 1 hourly using visual analogue scale (0-10) till the time to 1st request for analgesics or VAS ≥ 4, whichever comes first. Injection tramadol 50mg and injection paracetamol 1g will be used as rescue analgesia. Injection paracetamol will be given 6 hourly after the first dose for 24 hours. Duration of motor block will also be assessed via the Bromage Score along with assessment of VAS score. Time to regaining of the full flexion of knees and hips will be recorded. ;
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