Lidocaine Versus ESP - After Bariatric Surgery

Study Overview
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Brief Summary
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The Erector Spinal Block (ESP) is based on the deposition of the local anesthetic in the inter-fascial space between the dorsal extensor muscle and the intercostal muscles at the height of the transverse processes. The scope of the blockade covers the dorsal and ventral branches of the thoracic spinal nerves, but also in most cases the investigetors are able to obtain a wide distribution of the drug into the paravertebral space by permeating the local anesthetic through the fascial compartments. The clinical effect of the blockade is due to blocking the nerve structures of the paravertebral space (spinal nerve branches and the sympathetic trunk). The scope of the blockade, after its execution at the level of Th5, most often includes the segments from Th1 to L1. Lidocaine used in intravenous infusion is one of the recommended components of multidirectional analgesia. Its adjuvant properties make it possible to reduce the amount of opioid drugs used, and thus - to reduce the frequency of their side effects. The aim of the study is to test the effectiveness and safety of the use of lidocaine infusion or Erector Spinal Block in multimodal analgesic management.

Detailed Description
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In bariatric surgery, overall pain is a conglomerate of three different and clinically separate components: incisional pain (somatic pain), visceral pain (deep intra abdominal pain), and shoulder pain due to peritoneal stretching and diaphragmatic irritation associated with carbon dioxide insufflation. Moreover, it has been hypothesized that intense acute pain after labdomen surgery may predict development of chronic pain. Without effective treatment, this ongoing pain may delay recovery, mandate inpatient admission, and thereby increase the cost of such care.

Official Title
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Continuous Infusion of Lidocaine Versus Blockade of the Erector Spinae Plane Block - Comparison of Analgesic Efficacy in Patients After Bariatric Surgery

Conditions
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Local Anesthetics, Anesthetics

Intervention / Treatment
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* Drug: Ropivacaine injection
* Drug: Lidocaine IV


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients requiring bariatric surgery Obesity (BMI>35) Exclusion Criteria: Patient refusal Contraindications to paravertebral blocks: Infection at the site of needle insertion, empyema, allergy to local anesthetic drugs, and tumor occupying the thoracic paravertebral space, coagulopathy, bleeding disorder or therapeutic anticoagulation Known allergy to local anesthetics Inability to provide informed consent Any patient on opioids for greater than or equal to 3 months duration prior to surgery Patients with chronic pain syndromes

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: ESP block<br>Ultrasound-guided continuous ESP block with opioid PCA A high-frequency linear ultrasound transducer will be placed in a longitudinal parasagittal orientation 3 cm lateral to the T7/T8 spinous process. A Contiplex Echo ultra 360 18G needle with 20G × 55 cm Contiplex Echo catheter will be inserted using an in-plane superior-to-inferior approach to place the tip into the fascial plane on the deep (anterior) aspect of erector spinae muscle. The location of the needle tip will be confirmed by visible fluid spread lifting erector spinae muscle off the bony shadow of the transverse process. A total of 30 mL of 0.375% ropivacaine | Drug: Ropivacaine injection<br>* 30ml of 0.375% ropivacaine<br>* Other names: ESP block;|
| Active Comparator: lidocaine<br>Before induction bolus of 1% lidocaine 1,5mg/kg IBW i.v., continuous infusion of 1% lidocaine intraoperatively rate 1 mg/kg IBW i.v. | Drug: Lidocaine IV<br>* Before induction bolus of 1% lidocaine 1,5mg/kg IBW i.v., continuous infusion of 1% lidocaine intraoperatively rate 1 mg/kg IBW i.v.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total long acting opioid consumption in oxycodone equivalents | the total dosage of given drug | 2 days | 
| Pain scores will be recorded at intervals. | The Numerical Rating Scale (NRS) is an 11-point scale where 0 is no pain and 10 is the worst pain imaginable. | 2 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Acute Pain, Pain, Ropivacaine, Anesthetics, Local, Physiological Effects of Drugs