| Not Yet Recruiting | Erector Spinae Block vs. Placebo Block Study NCT03978780 | Women's College Hospital | N/A |
| Not Yet Recruiting | Erector Spinae Plane Block Versus External Oblique Intercostal Plane Block for Analgesia in Open Cholecystecto NCT07533279 | Sohag University | N/A |
| Not Yet Recruiting | Ultrasound-Guided Erector Spinae Plane Block Versus Thoracoscopically-Guided Intercostal Nerve Block in Video- NCT07535697 | Sana Klinikum Offenbach | N/A |
| Not Yet Recruiting | Artificial Intelligence vs. Automated Messaging for Continuous Regional Analgesia Follow-up NCT07510425 | Pontificia Universidad Catolica de Chile | N/A |
| Recruiting | DIPB vs. SIFIB for Postoperative Analgesia After Hip Surgery NCT07452120 | Sivas Numune Hospital | N/A |
| Recruiting | Effect of Gestational Weight Gain on Spinal Anesthesia in Elective Cesarean Delivery NCT07326644 | Elazıg Fethi Sekin Sehir Hastanesi | — |
| Not Yet Recruiting | Neurological Events and Unforeseen Risks After Locoregional-anesthesia NCT07238933 | Societa Italiana Anestesia Analgesia Rianimazione e Terapia Intensiva | — |
| Recruiting | Sensory Analysis and Cutaneous Mapping of Different Regional Anesthesia Techniques NCT07445854 | Samsun University | — |
| Not Yet Recruiting | IPP-PSP Block vs. SPSIPB in Breast Surgery NCT07246720 | Zonguldak Bulent Ecevit University | N/A |
| Recruiting | The Lateral, Anterior, Medial (LAM) Femoral Cutaneous Block: A Case Series Harborview Medical Center, Seattle, NCT07221903 | University of Washington | — |
| Recruiting | Revision of Deep Brain Stimulator in Patients With Parkinson's Disease NCT07176494 | Ankara Etlik City Hospital | N/A |
| Not Yet Recruiting | Insufficient Regional Anesthesia for Cesarean Section: Mothers' Experiences A Qualitative Study NCT07134179 | Sygehus Lillebaelt | — |
| Recruiting | Regional Anesthesia in TKA: Impact on Postoperative Joint Motion and Patient Satisfaction NCT07124494 | Konya City Hospital | N/A |
| Completed | EOIB for Laparoscopic Sleeve Gastrectomy NCT07101835 | Ondokuz Mayıs University | — |
| Completed | Effect of Pre- and Postoperative ESP Block on Frontal QRS-T Angle in Laparoscopic Cholecystectomy NCT07058194 | Harran University | N/A |
| Recruiting | The Sacral Erector Spinae Plane Block in Total Knee Arthroplasty NCT07017400 | San Giovanni di Dio Hospital | — |
| Not Yet Recruiting | Serratus Posterior Plane Block vs Erector Spine Plane Block NCT07021131 | Masarykova Nemocnice v Usti nad Labem, Krajska Zdravotni a.s. | N/A |
| Enrolling By Invitation | SFIB vs PENG Block in the Anesthesia for Total Hip Replacement NCT07061223 | State Budgetary Healthcare Institution, National Medical Surgical Center N.A. N.I. Pirogov, Ministry of Health of Russia | N/A |
| Not Yet Recruiting | When to Block? Timing of Scalp Block in Craniotomy NCT07043621 | Sakarya University | N/A |
| Recruiting | Lidocaine vs. Lidocaine With Dexmedetomidine for Intravenous Regional Anesthesia (IVRA) in Upper Limb Surgery NCT07034300 | Fatima Memorial Hospital | Phase 4 |
| Recruiting | Perioperative Use of Erector Spinae Plane Block (ESPB) and Intravenous Lidocaine Infusion in Anesthetic Manage NCT06965933 | Saint Petersburg State University, Russia | Phase 4 |
| Completed | Brachial Plexus Block vs General Anesthesia in Upper Extremity Surgery NCT07352839 | Adana City Training and Research Hospital | N/A |
| Enrolling By Invitation | Comparing Postoperative Analgesic Techniques for Umbilical Hernia Repair: A Randomized Trial of Ultrasound Gui NCT06948253 | Tanta University | N/A |
| Completed | Effects of 10 Versus 20 mL Local Anesthetic for Popliteal Plexus Block on Opioid Consumption, Pain, and Patien NCT06908837 | Regionshospitalet Silkeborg | Phase 4 |
| Completed | Exploring the Efficacy of Assistive Artificial Intelligence for Ultrasound Guided Regional Anesthesia in Resid NCT06667401 | Medical College of Wisconsin | — |
| Recruiting | Insufficient Regional Anesthesia and Conversion to General Anesthesia for Cesarean Section A Qualitative Multi NCT06669156 | Sygehus Lillebaelt | — |
| Not Yet Recruiting | Impact of Smoking on Ultrasound-Guided Infraclavicular Brachial Plexus Block Onset and Duration NCT06755229 | Selcuk University | — |
| Completed | Comparison of Sacral Erector Spinae Plane Block and Supra-Inguinal Fascia Iliaca Block for Analgesia After Hip NCT07081867 | Prof. Dr. Cemil Tascıoglu Education and Research Hospital Organization | — |
| Not Yet Recruiting | Mixed Local for Sciatic Block NCT06671028 | London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's | N/A |
| Not Yet Recruiting | Comparative Analysis of Ultrasound-Guided Versus Landmark-Based Techniques for Regional Anesthesia in Egyptian NCT06756347 | Assiut University | N/A |
| Completed | Analgesic Effect of Bilateral Subcostal Quadratus Lumborum Block in Laparoscopic Colorectal Surgery NCT06653439 | Ondokuz Mayıs University | N/A |
| Completed | Evaluation of ChatGPT-4's Success Sonoanatomy NCT06642389 | Kanuni Sultan Suleyman Training and Research Hospital | — |
| Completed | Effect of Virtual Reality on Anxiety, Stress, and Patient's Satisfaction Among Patients Undergoing Regional An NCT07132216 | Cairo University | N/A |
| Completed | Ultrasound Guided Serratus Anterior Plane Block in ED Patients With Rib Fractures NCT06299137 | Rhode Island Hospital | EARLY_Phase 1 |
| Recruiting | Ultrasound-guided Peripheral Nerve Blocks - a Database NCT06460792 | Nordsjaellands Hospital | — |
| Completed | Postoperative Follow-up Via Text Messages Automated Versus Telephone in Patients With Continuous Regional Anes NCT06313294 | Pontificia Universidad Catolica de Chile | N/A |
| Completed | Chronic Pain in Post-Mastectomy Patients; The Difference Between Pectoral Nerve (PECS I-II) and Erector Spinal NCT06900842 | Hacettepe University | — |
| Active Not Recruiting | Transversalis Fascia Plane Block in Pediatric Patients NCT06391528 | Zonguldak Bulent Ecevit University | N/A |
| Completed | PENG and LFCN Block Versus FIC Block for Multimodal Analgesia After Total Hip Replacement Surgery: a Retrospec NCT06342102 | Ospedale Edoardo Bassini | — |
| Active Not Recruiting | Postoperative Pain Management in Laparoscopic Cholecystectomies NCT06326281 | Ankara City Hospital Bilkent | N/A |
| Completed | Dexmedetomidine as an Adjuvant to Bupivacaine in Scalp Block vs Bupivacaine Alone for Hemodynamics Stability i NCT06951256 | Ain Shams University | N/A |
| Unknown | Nociception Index Level (NOL) Perioperative Monitoring During Regional Anesthesia NCT06300606 | American Hospital of Paris | — |
| Unknown | Duration of Analgesia in Bier Block for Patients Undergoing Hand Surgery NCT05578885 | Michael Bishay Shehata Keroles | N/A |
| Completed | Comparison of Regional Anaesthesia Methods for Femoral Neck Fracture Surgery NCT06224439 | Bursa Yuksek Ihtisas Training and Research Hospital | N/A |
| Completed | The Effects of Abdominal Plane Blocks on Postoperative Quality of Recovery NCT06753240 | Fatih Sultan Mehmet Training and Research Hospital | — |
| Completed | Retrospective Evaluation of Effect of Anterior Iliac Block NCT06295224 | Kocaeli University | — |
| Completed | Comparative Impacts of Two Anesthesia Methods on Peripheral Tissue Oxygenation in the Upper Limb NCT07449611 | Sakarya University | N/A |
| Completed | Effect of Preoperative PENG Block on Spinal Anesthesia Positioning and Postoperative Analgesia in Hip Fracture NCT07194356 | Dr. Lutfi Kirdar Kartal Training and Research Hospital | N/A |
| Unknown | Comparison of Post-operative Analgesia in Pediatric Superficial TTMPB NCT05792345 | Centre Hospitalier Universitaire Vaudois | N/A |
| Unknown | U.S. Guided Erector Spinae Block for Postoperative Pain Management in Paraumbilical Hernia Repair Patients NCT06120088 | Assiut University | — |
| Completed | Comparison of Intermittent Bolus Vs. Continuous Infusion PENG Block for Postoperative Pain in Hip Surgery NCT06834243 | Onur Baran | — |
| Unknown | Consent in Anaesthesia NCT06115720 | Imperial College Healthcare NHS Trust | N/A |
| Unknown | Analgesic Efficacy of Ultrasound-guided Bilateral Pecto-intercostal Plane Block in Pediatric Cardiac Surgery NCT06089798 | Başakşehir Çam & Sakura City Hospital | — |
| Completed | Predictive Factors for the Effectiveness of the Ilioinguinal Iliohypogastric Nerve Block for Hernia Surgery NCT06121726 | University of Padova | — |
| Completed | Evaluation of the Efficacy of Regional Anaesthesia for Analgesia After Laparoscopic Cholecystectomy NCT06008002 | Bursa Yuksek Ihtisas Training and Research Hospital | N/A |
| Unknown | Modified Thoracoabdominal Nerve Block(M-TAPA) in Pediatric Laparoscopic Appendectomies NCT06039150 | Gulhane Training and Research Hospital | N/A |
| Completed | The Effect of Adjuvant Dexamethasone on Postoperative Pain, Analgesic Consumption and Block Properties in SFIB NCT05979597 | Samsun Education and Research Hospital | N/A |
| Completed | M-Tapa Block vs External Oblique Intercostal Block for Laparoscopic Sleeve Gastrectomy Surgery NCT05939635 | Ondokuz Mayıs University | N/A |
| Completed | US-guided Pericapsular Nerve Group (PENG) Block in Different Volumes on Postoperative Pain in Hip Replacement NCT06166602 | Istanbul Medeniyet University | N/A |
| Completed | Comparison of Combination of Proximal ACB and iPACK With Large-Volume Distal ACB for Early Mobilization After NCT06525493 | Indonesia University | N/A |
| Completed | Laparoscopic Sleeve Gastrectomy Surgery and External Oblique Intercostal Block NCT05822479 | Ondokuz Mayıs University | N/A |
| Unknown | Sub Omohyoid Suprascapular Nerve Block Versus Interscalene Nerve Block NCT05796778 | Minia University | N/A |
| Completed | Comparison of Continuous Fascia Iliaca Compartment Block With Continuous PENG Block in Total Hip Replacement C NCT06806865 | Namik Kemal University | N/A |
| Unknown | MUSIC-CARE and Locoregional Anesthesia for Orthopedic Surgery NCT05015985 | American Hospital of Paris | N/A |
| Completed | The Effect of Different Methods of Airway Management on the Stomatognathic System: an Observational Prospectiv NCT05783128 | Aretaieio Hospital | — |
| Completed | Serratus Intercostal Block Versus Epidural/Port Infiltration Analgesia in Eventration: Prospective Non Inferio NCT06014749 | Hospital del Rio Hortega | — |
| Completed | Caudal Epidural Vs. TAP Block for Postoperative Analgesia in Pediatric Infraumbilical Surgery: a RCT NCT06895382 | Namik Kemal University | N/A |
| Completed | Interscalene Versus Costoclavicular Blocks for Shoulder Surgery NCT06953947 | Sakarya University | N/A |
| Unknown | Regional Analgesia in Combination With Cryoanalgesia to Prevent Acute Pain Following Nuss Procedure NCT05589246 | Pomeranian Medical University Szczecin | N/A |
| Withdrawn | Comparison of Caudal Block and Retrolaminar Block for Circumcision NCT06584292 | Kanuni Sultan Suleyman Training and Research Hospital | N/A |
| Recruiting | Stress Reduction Using Video Googles on Patients Undergoing Vascular Surgery NCT06704230 | University Hospital Augsburg | N/A |
| Unknown | Erector Spine Plane (ESP) Block for Analgesia in Pediatric Scoliosis Surgery NCT05944393 | Poznan University of Medical Sciences | N/A |
| Completed | Comparing Suprainguinal Fascia Iliaca Block With Erector Spinae Plane Block in Hip and Proximal Femur Surgery NCT05642975 | Marmara University | N/A |
| Completed | Evaluation of Postoperative Analgesic Efficacy of Suprainguinal Fascia Iliaca Block NCT05450211 | Samsun Education and Research Hospital | N/A |
| Completed | Pain Reduction in Maxillomandibular Surgery Using Maxillary and Mandibular Nerve Blocks NCT05351151 | University Hospital, Toulouse | N/A |
| Completed | Comparison of Postoperative Analgesic Efficacy of Transversalis Fascia Plan Block and Erector Spina Plan Block NCT05344105 | Samsun Education and Research Hospital | N/A |
| Completed | Efficacy of Combined Adductor and Tibial Nerve Blocks for Pain Management in Knee Arthroplasty NCT06552897 | Ankara City Hospital Bilkent | N/A |
| Unknown | Uncontrolled Disinformation About Regional Anesthesia and Pregnant Patients. NCT05416541 | Ankara City Hospital Bilkent | — |
| Completed | SIFIB As an Anesthesia Method for Lower Extremity Surgeries NCT06076096 | Samsun University | — |
| Completed | Analgesia in Minimally Invasive Direct Coronary Artery Bypass Grafting: Programmed Intermittent Bolus Infusion NCT05320718 | Peking University Third Hospital | N/A |
| Unknown | Use of Galvanic Skin Response to Measure Peripheral Block Activity NCT05678777 | Adiyaman University | — |
| Completed | Tissue Perfusion for Different Approaches of Brachial Plexus Block NCT04764591 | Zonguldak Bulent Ecevit University | N/A |
| Completed | Comparation of Bilateral and Unilateral Erector Spinae Plane Block NCT05152602 | Ankara City Hospital Bilkent | — |
| Completed | Analgesic Effect of Bilateral Erector Spinae Plane Block With Ropivacaine After Sternotomy for Cardiac Surgery NCT05160298 | University Hospital, Clermont-Ferrand | Phase 2 |
| Completed | Rectus Sheath Block and Local Wound Infiltration in Pediatric Laparoscopic Appendectomies NCT06913205 | Bursa City Hospital | — |
| Terminated | iPACK Block With Dexamethasone For Total Knee Replacement NCT04917055 | University of California, San Diego | Phase 4 |
| Unknown | Tramadol Versus Dexamethasone as Adjuvant to Levobupivacaine Supraclavicular Block NCT04551833 | Assiut University | Phase 4 |
| Terminated | Cerebral Blood Flow Evaluation With Trancranial Doppler After Interscalene Nerve Block NCT04642612 | Stanford University | — |
| Unknown | Subcutaneous Injection of Large Volumes of Tumescent Lidocaine and Epinephrine by Laypersons NCT04733781 | Jeffrey Alan Klein, MD | Phase 2 / Phase 3 |
| Completed | Comparison of PENG Block and FICB in Hip Fracture Patients NCT04677348 | Asan Medical Center | N/A |
| Terminated | Hemi-diaphragmatic Paresis After Erector Spinae Plane Block NCT04706780 | Antalya Training and Research Hospital | — |
| Unknown | EFFECT - EFFectiveness of ESPB (Erector Spinae Plane Block) in Laparoscopic Cοlectomies Trial NCT04879004 | Democritus University of Thrace | N/A |
| Withdrawn | Quadratus Lumborum vs Erector Spinae Supplementary Blocks With Lumbar Plexus Blocks for Hip PAO NCT04481451 | Boston Children's Hospital | Phase 4 |
| Completed | Regional Anesthesia in Breast Surgery NCT04629612 | Taipei Veterans General Hospital, Taiwan | N/A |
| Completed | Ultrasound Guided Posterior Quadratus Lumborum Block for Postoperative Analgesia in Gynecologic Surgery NCT04549090 | Pedram Bral | — |
| Completed | Evaluation of Ultrasound-guided Erector Spinae Block for Postoperative Analgesia in Laprascopic Ventral Hernia NCT04438369 | Ostfold Hospital Trust | N/A |
| Completed | Peri-articular Injection and (IPACK) With Adductor Canal Block in Total Knee Arthroplasty. NCT04396652 | Tanta University | N/A |
| Completed | Radiological Study of PENG Block Depth NCT04337164 | Centre Hospitalier Universitaire de Besancon | — |
| Completed | SARS-CoV-2 PANDEMIC AND FAILED SPINAL ANESTHESIA NCT05067985 | Ankara City Hospital Bilkent | — |
| Completed | Efficacy of Continuous Sciatic Nerve Block in Diabetic Foot Patients NCT04212325 | Gulhane School of Medicine | N/A |
| Completed | Nociception-directed Erector Muscle Spinae Plane Block in Open Heart Surgery NCT04338984 | Institutul de Urgenţă pentru Boli Cardiovasculare Prof.Dr. C.C. Iliescu | Phase 4 |
| Completed | Ultrasound-guided PNB and DPNB for Pediatric Distal Hypospadias Surgery NCT04668183 | Prof. Dr. Cemil Tascıoglu Education and Research Hospital Organization | — |
| Terminated | Erector Spinae Plane Block for Major Gynecologic and Urologic Surgery NCT03500744 | London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's | N/A |
| Unknown | Pudendal Nerve Block vs Penile Nerve Block for Analgesia During Pediatric Circumcision NCT03914365 | CHU de Quebec-Universite Laval | N/A |
| Unknown | SERRATHOR TRIAL : Interest of the Novel Serratus Plane Block in Post Operative Analgesia After Video-Assisted NCT03867695 | University Hospital, Strasbourg, France | N/A |
| Unknown | Regional Anesthesia and Analgesia Techniques in Obese Patients NCT04197752 | Istanbul University | — |
| Completed | Comparison of OSTAP, ESP Block,Injection of Local Anesthetic to Trocar Insertion for Elective Laparoscopic Cho NCT03719157 | Diskapi Yildirim Beyazit Education and Research Hospital | N/A |
| Terminated | The Use of Lumbar Erector Spinae Plane Block for Hip Arthroplasty at the L4 Interspace NCT03801863 | Montefiore Medical Center | — |
| Terminated | ESP Volunteer LA Spread Controlled by MRI NCT03751358 | Vinmec Healthcare System | N/A |
| Completed | Ultrasound Assessment of Diaphragmatic Dysfunction in Regional Anesthesia NCT04700943 | University of Turin, Italy | — |
| Completed | The Impact of Nerve Cross Section Area on Sensory Block Onset NCT03797235 | Jose Aguirre | N/A |
| Withdrawn | Serratus Anterior Muscle Plane Block vsThoracic Paravertebral Block For Unilateral Mastectomies NCT02822196 | The University of Texas Health Science Center, Houston | Phase 4 |
| Completed | Comparison of 0.375% Ropivacaine and 0.25% Levobupivacaine for Infraclavicular Brachial Plexus Block NCT03679897 | Asan Medical Center | Phase 4 |
| Unknown | The Impact of Anterior Abdominal Wall Tissue Oxygenation During Pneumoperitoneum of Regional Anesthesia Method NCT03652506 | Bursa Yuksek Ihtisas Training and Research Hospital | N/A |
| Completed | Analgesic Efficacy of Single-shot Erector Spinae Block for Thoracic Surgery NCT03419117 | University of British Columbia | N/A |
| Unknown | CMRA for US-guided-MWA of Liver Tumors NCT05990257 | Lu Wang | N/A |
| Completed | Perioperative Analgesia for Total Hip Arthroplasty NCT04670497 | Menoufia University | N/A |
| Terminated | Continous Lumbar Plexus Block in Children NCT03450096 | Insel Gruppe AG, University Hospital Bern | N/A |
| Completed | Anesthesia for Pain After Ankle Fracture Surgery NCT02950558 | University of Cincinnati | Phase 4 |
| Completed | Comparing Through-the-Needle With Suture-Method Catheter Designs for Popliteal Nerve Blocks NCT03442036 | University of California, San Diego | N/A |
| Completed | Caudal Block and Transversus Abdominis Plane Block in Pediatric Inguinal Hernia Repair NCT05286190 | Istanbul University | N/A |
| Completed | USG Thoracolumbar Interfascial Plane (TLIP) in Lumbar Spine Surgeries NCT03193658 | Eslam Ayman Mohamed Shawki | N/A |
| Completed | PECS-2 for Breast Surgery NCT03117894 | Umeå University | N/A |
| Unknown | Serratus Anterior Plane Block: Post-operative Analgesia in Video-assisted Thoracic Surgery NCT03277391 | Université Libre de Bruxelles | N/A |
| Completed | A Randomized Clinical Trial NCT03947463 | Shaukat Khanum Memorial Cancer Hospital & Research Centre | N/A |
| Completed | IINB vs. QLB for Elective Open Inguinal Herniorrhaphy NCT03007966 | Wake Forest University Health Sciences | Phase 2 |
| Unknown | Pudendal Block Versus Penian Block For Circumcision In Children NCT03046290 | Université Libre de Bruxelles | N/A |
| Unknown | Continuous Infusion for Pain Relief NCT02711072 | Tunisian Military Hospital | N/A |
| Completed | Post-discharge Pain After Breast-surgery Treated by Paravertebral Block NCT03618459 | Samuele Ceruti | — |
| Unknown | Comparison of the Sensitive Cutaneous Block Distribution Following Femoral Nerve Block Using Two Femoral Block NCT02721290 | Maisonneuve-Rosemont Hospital | N/A |
| Unknown | Maximal Distance for Successful Supraclavicular Block NCT02383134 | Tunisian Military Hospital | — |
| Unknown | is There an Alternative to Ultrasound Guided Interscalene Block? NCT02397330 | Tunisian Military Hospital | N/A |
| Completed | Bilateral Transversus Abdominis Plane Block Versus Atracurium During Laparoscopic Gynecology Procedures. NCT03701256 | University Tunis El Manar | Phase 4 |
| Completed | Displacement of Popliteal Sciatic Nerve Catheters After Major Foot and Ankle Surgery NCT02200016 | Kolding Sygehus | Phase 4 |
| Unknown | Cerebral Oximetry for Carotid EEA NCT02203370 | Salzburger Landeskliniken | — |
| Completed | Evaluation of a New Training Model for Ultrasound Guided Regional Anesthesia - A Feasibility Study NCT02370472 | Milton S. Hershey Medical Center | N/A |
| Terminated | Nerve Block Washout NCT02050295 | University of Alberta | N/A |
| Completed | Comparison of Epidural and TAP Block in Abdominal Surgery NCT01848951 | University of Nebraska | — |
| Terminated | Continuous Lumbar Plexus Block With and Without Parasacral Block in Patients Undergoing Total Hip Replacement NCT02161484 | Rita Merman | N/A |
| Completed | Transversus Abdominis Plane Block and Inguinal Hernia Repair NCT02030223 | Papacharalampous Panagiota | N/A |
| Completed | Monocyte Subsets Altered by Anesthesia NCT03431532 | University Hospital, Saarland | — |
| Completed | Distance for Interscalene Block NCT01568463 | University Health Network, Toronto | — |
| Terminated | Spinal Anesthesia in Patients With Poorly-palpable Surface Landmarks NCT03377764 | University Health Network, Toronto | — |
| Completed | Does Interneural Local Anesthetic Spread at the Site of Sciatic Nerve Bifurcation Shorten Block Onset Time? NCT01568476 | University Health Network, Toronto | N/A |
| Unknown | Comparison of Safety And Efficacy of Neuraxial Anesthesia, Palpation Versus Ultrasound NCT01322126 | Hadassah Medical Organization | N/A |
| Completed | A Retrospective Clinical Registry of Peripheral Nerve Block NCT04451642 | Instituto de Investigación Sanitaria Aragón | — |
| Terminated | Registry for Acute Pain Treatment NCT02846610 | University Hospital, Saarland | — |
| Completed | Use of Ultrasound in Lower Extremity Blocks. NCT00221910 | University Health Network, Toronto | N/A |
| Completed | Use of Ultrasound in Upper Extremity Blocks. NCT00221884 | University Health Network, Toronto | N/A |
| Completed | Regional Anesthesia Database NCT00221858 | University Health Network, Toronto | — |
| Completed | Visualizing Peripheral Nerves Using Ultrasound-Guided Approach NCT00221949 | University Health Network, Toronto | — |