Echogenic Versus Stimulating Needle and Catheter for Sciatic Blocks (Echostim1)
Comparison of Visibility of Echogenic and Standard Non-echogenic Block Needles During Ultrasound Guided Sciatic Blocks. A Randomized Prospective Study
Patients scheduled for total knee replacements and suitable for sciatic nerve block will be randomized to one of 2 groups.
Group 1 will have the nerve block performed using a standard Pajunk block needle under ultrasound guidance and with electrical nerve stimulation (ENS), and have catheter placement also guided by electrical nerve stimulation. Group 2 will have the block performed using a Sonoplex echogenic block needle and have an echogenic catheter sited, all under ultrasound (US) guidance. Group 2 will have needle location aided by ENS, but ENS will not be used for catheter location.
An observer blinded to the needle type will assess the quality of needle visualisation on a recording of the US image taken during the procedure, along with adequacy of spread of local anesthetic. The primary outcome will be needle visibility, and secondary outcomes will be block success rate, block performance time, complication rate, number of needle passes per block, and adequacy of spread of local anesthetic.
研究概览
地位
详细说明
A total of 70 patients with ASA physical status 1 to 4, scheduled for elective total knee arthroplasty and deemed suitable to receive a sciatic nerve block will be included in the study. They will be randomised to one of two groups prior to the block procedure using a closed envelope system.
Recruitment will take place in the preoperative clinic. All blocks will be performed in the block room using standard monitoring, sterile precautions and titrated intravenous sedation.
Prior to the sciatic nerve block a continuous femoral nerve block will be performed according to standard procedure. Once this is complete the patient will be positioned for the sciatic nerve block.
A preprocedural scan will be done as per standard practice and skin will be infiltrated with 1% lidocaine.
The anaesthetist performing the block will be aware of the study group allocation due to the requirement for physically handling the block needles, and will proceed to position the needle into the required location site to facilitate catheter insertion, with the aid of electrical nerve stimulation via the needle. This will be recorded using the ultrasound machines cineloop facility.
If after 6 passes the operator is unable either to contact the nerve according to the ultrasound image or elicit a twitch response, the procedure will be abandoned and this will be considered a failed block. In this case analgesia will be covered with periarticular infiltration and opioids.
During needle positioning, the observer will record the number of needle redirections required to optimally locate the needle, each redirection being defined as every movement which follows a withdrawal of more than 2cm. The observer will also record the number of skin punctures required and any arterial or venous punctures.
Group E will have the block performed using the echogenic needle, and the echogenic catheter will be placed using ultrasound guidance.
The catheter will be inserted through the needle by a second anesthetist. This process will be continuously recording using the cineloop feature of the ultrasound machine. Once the catheter is deemed to be in an appropriate position, local anaesthetic will be injected by the second anaesthetist while observing the disposition of the local anaesthetic perineurally in short axis. This will be confirmed with a long axis view of the nerve (also recorded).
Group S will have the block performed with a standard needle and catheter, guided by electrical nerve stimulation.
Acceptable muscle twitch response will be plantar- or dorsiflexion, inversion or eversion with an initial nerve current strength of 0.5mA at a frequency of 2Hz. If a satisfactory motor response cannot be elicited, current will be increased in stages to 1.5mA. If a response still cannot be elicited this will be recorded but the catheter will still be used if its position is deemed satisfactory using colour Doppler - a medley of colour adjacent to the nerve with the injection of agitated dextrose 5%. Once the catheter is deemed to be in an appropriate position, local anaesthetic will be injected by the second anaesthetist while observing the disposition of the local anaesthetic perineurally in short axis. This will be confirmed with a long axis view of the nerve (also recorded).
Once the catheter has been sited using the above techniques, a bolus of agitated 5% dextrose will be injected through the catheter and Doppler ultrasound will be used to locate where in the tissues the injected fluid is being deposited. This will also be recorded and subsequently assessed.
An assistant present during the block will time two aspects of the procedure:
- Time from first skin contact with needle to first muscle response to nerve stimulation. This will be done only on the day of surgery during the block procedure until the desired muscle twitch is elicited.
- Time from first skin contact to completion of catheter insertion (Block time).This is done during the block procedure only on the day of surgery as noted above
Once catheter position has been assessed a total of 20 millilitres of 2% mepivacaine will be injected via the catheter in both groups. Over the subsequent 30 minutes a second blinded observer will take observations every 5 minutes to assess the degree of motor and sensory block.
The video recording of the block procedure will be sent along with the data collection form to two of the co-investigators, who will independently assess the following:
At the time of nerve contact by the needle, assign a rating for visibility of the needle shaft and tip according to the following scale:
- not visualised or poorly visualised - needle tip/shaft being isoechoic or only slightly more echogenic than background parenchyma.
- tip or shaft visualised with some difficulty - tip/shaft readily identified as being more echogenic than the background parenchyma but not seen in their entirety
- excellent visibility shaft and tip strongly echogenic relative to tissue and visualised in their entirety.
- Assign the same rating after completion of injection
- Judge whether circumferential and longitudinal spread of local anaesthetic is either adequate or inadequate.
Following the operation a standard infusion of 0.1% ropivacaine at 4cc/hr will be commenced via the sciatic catheter. Post operative care will be as per the standard practice at this institution.
One week post operatively the patient will be telephoned at home to check for persisting neurological symptoms.
研究类型
注册 (实际的)
阶段
- 第三阶段
联系人和位置
学习地点
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-
Ontario
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London、Ontario、加拿大、N6A 5A5
- London Health Sciences Centre University Hospital
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
Inclusion Criteria:
- Patients age 18-80 years listed for total knee arthroplasty.
- ASA I-IV.
- Able to give informed consent
- Able to cooperate with study protocol.
Exclusion Criteria:
- Standard contraindication to regional anaesthesia/analgesia: local infection, coagulopathy, local anaesthetic allergy, patient refusal, diabetes mellitus, peripheral neuropathy, pre-existing nerve injury)
- Inability to consent
- Patient refusal
- Pregnant patients
学习计划
研究是如何设计的?
设计细节
- 主要用途:治疗
- 分配:随机化
- 介入模型:并行分配
- 屏蔽:双倍的
武器和干预
参与者组/臂 |
干预/治疗 |
---|---|
实验性的:Echogenic needle and catheter
The echogenic needle will be positioned using ultrasonography and neurostimulation with an end point of plantar or dorsiflexion with 0.6mA of current strength.
The catheter will be inserted using ultrasonography alone.
20 Ml of 2% mepivacaine will be inserted using the catheter.
The distribution of drug will be evaluated using short axis and long axis views.
Sensory motor block evaluation every 5 minutes for 30 minutes.
Duration of block procedure, number of passes and success will be evaluated
|
Visibility of needle shaft and tip with engraved markers.
Ultrasonographic Visibility of catheter tip
其他名称:
|
有源比较器:Neurostimulation
The non echogenic needle will be positioned using ultrasonography and neurostimulation with plantar or dorsiflexion as the end point with 0.6mA current.The catheter will be positioned using neurostimulation with plantar or dorsiflexion with 0.6-1.5mA
current.
|
The non echogenic needle will be positioned using ultrasonography and neurostimulation and the catheter will be positioned using neurostimulation with plantar or dorsiflexion with 0.6-1.5mA
current.
20mL of 2% mepivacaine will be injected via the catheter.
Sensory motor block will be evaluated every 5 minutes for 30 mins
其他名称:
|
研究衡量的是什么?
主要结果指标
结果测量 |
措施说明 |
大体时间 |
---|---|---|
Visibility of needle tip and catheter tip
大体时间:Day 1
|
Needle tip visibility graded by blinded observers Catheter tip visibility graded by blinded observers
|
Day 1
|
次要结果测量
结果测量 |
措施说明 |
大体时间 |
---|---|---|
number of needle passes
大体时间:Day 1
|
The number of times the needle is withdrawn more than 2 cm and resited
|
Day 1
|
success rate of block
大体时间:Day 1
|
Motor and sensory block will be evaluated on standard grading system every 5 minutes for 30 minutes post injection
|
Day 1
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Block procedure time
大体时间:Day 1
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Time from needle insertion to the end of catheter insertion
|
Day 1
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Immediate complications
大体时间:Day 1
|
Vascular punctures, venous or arterial
|
Day 1
|
delayed complications
大体时间:One week after surgery/block
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telephone interview to elicit delayed neurologic symptoms
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One week after surgery/block
|
合作者和调查者
调查人员
- 首席研究员:Sugantha Ganapathy、Professor, Director, regional and Pain reseaerch
出版物和有用的链接
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (估计)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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