Preoperative Continuous Sciatic Perineural Analgesia in Patients Undergoing Lower Limb Revascularization

Study Overview
=================
Brief Summary
-----------------
This study evaluates the pain score numerical rating, after sciatic analgesic continuous block, in patients with ischemic pain before surgery of limb revascularization. All patients received those blocks to control ischemic severe pain.

Detailed Description
-----------------
Peripheral Obstructive Arterial Disease (PAD) is a disease with a prevalence of 10 to 25% in the population over 55 years, increasing with age, and may have disabling pain as a symptom, and sometimes the surgical approach is required. In the context of public hospital in Rio de Janeiro, where patients need to wait for surgery, the Anesthesiology and Acute Pain service routinely has sciatic nerve analgesic block in the popliteal region as a preoperative procedure. The primary objective of the present study is to describe a series of cases where the technique was applied in order to relieve the pain of these patients, following the Pain Score Numerical rating as a reference. Secondary objectives will be to describe difficulties associated with the technique and possible associated adverse factors.

Official Title
-----------------
Preoperative Continuous Sciatic Perineural Analgesia, as a Bridge Therapy for Ischemic Pain, in Patients Undergoing Lower Limb Revascularization: a Retrospective Descriptive Study

Conditions
-----------------
Ischemic Leg, Peripheral Vascular Disease

Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: preoperative continuous sciatic-popliteal nerve block lower limb angioplasty peripheral arterial disease; between 2017 and 2018 years; correct filling of numerical rating pain evaluation in the medical record Exclusion Criteria: peripheral block to treat another pathology or condition in te same patient; peripheral block at another concomitant site (other than the popliteal); No adequate record of the care received in the medical record if medical record is not available during the data collection period
Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------
What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| change in numerical pain scale | Numerical Pain Scale (END) self-assessed by the patient before and after 24 hours of continuous analgesic block of the sciatic nerve, with infusion of levobupivacaine 0,125% or ropivacaine 0,2%. The scale score is 0-10 (0= no pain; 10 = pain as bad as can be) | 24 hours after placement of sciatic catheter | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| change in numerical pain scale | Numerical Pain Scale (END) self-assessed by the patient before and after 72 hours of continuous analgesic block of the sciatic nerve, with infusion of levobupivacaine 0,125% or ropivacaine 0,2%. The scale score is 0-10 (0= no pain; 10 = pain as bad as can be) | 72 hours after placement of sciatic catheter | 
| classification of technique difficulties | To report, qualitatively, the presence of variations or difficulties in the use of the technique, such as: failure of the technique (FT); existence of concomitant venous analgesia (VA); inadequate registration of the technique (IR) | 72 hours after placement of sciatic catheter | 
| classifications of possible complications | Report, qualitatively, the presence of possible complications, such as: hyperemia of the catheter insertion site (HC); the presence of pus (PUS); catheter displacement (CD) | 72 hours after placement of sciatic catheter | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
continuous peripheral block, sciatic block, ischemic pain