The erector spinae plane block is an ultrasound-guided injection of local anesthetic alongside the spine, placed deep to the erector spinae muscles and against a vertebral transverse process. First described in 2016 for thoracic neuropathic pain, it has rapidly become one of the most versatile regional anesthesia techniques in modern practice, used across chest, abdominal, spinal, and even hip surgeries to reduce pain and cut opioid use after operations.1Regional Anesthesia & Pain Medicine. The Erector Spinae Plane Block: A Novel Analgesic Technique in Thoracic Neuropathic Pain Its appeal rests on a combination that is unusual in regional anesthesia: straightforward anatomy, a strong safety record, and a surprisingly wide reach of pain relief from a single injection point.
Where the Numbness Comes From
The erector spinae muscles are the long columns of muscle that run up either side of your spine. In this block, local anesthetic is deposited in the fascial plane just deep to those muscles, right against a transverse process of a vertebra. From there, the drug does not stay put. It seeps through connective tissue along several pathways, and this diffuse spread is what gives the block such a broad analgesic footprint.
An MRI study in healthy volunteers showed that after a single injection, the anesthetic consistently reached the erector spinae muscles themselves and the intercostal space. Nine out of ten volunteers had spread into the paravertebral space, and eight out of ten had spread to the neural foramina, where spinal nerves exit the vertebral column. Four out of ten even had some degree of epidural spread.2Regional Anesthesia & Pain Medicine. Spread of local anesthetics after erector spinae plane block: an MRI study in healthy volunteers This variability explains both the block’s strengths and its quirks: it can numb a wide swath of the trunk, but exactly how far the numbness reaches differs from person to person.
Volume matters. A cadaveric study found that injections of 30 to 40 mL spread across roughly four to seven vertebral levels, while volumes of 60 to 80 mL reached twelve to thirteen levels.3PubMed. Relationship between injectate volume and disposition in erector spinae plane block: a cadaveric study Separate cadaveric work injecting 20 mL at the T7 level showed dye spreading from T1 all the way to T11, with lateral extension toward the rib-spine junction.4PubMed. Anatomical evaluation of the extent of spread in the erector spinae plane block: a cadaveric study In clinical practice, this means practitioners can tailor how many spinal segments they cover by adjusting both the injection site and the volume of anesthetic.
Use in Chest and Heart Surgery
Thoracic surgery was one of the first proving grounds for the block, and the evidence here is mature. In patients undergoing video-assisted thoracic surgery, those who received an ESP block had average pain scores roughly half those of patients who received a traditional intercostal nerve block. They also spent less time in the recovery unit and preserved more of their lung function in the first 24 hours after surgery.5The Annals of Thoracic Surgery. Erector Spinae Plane Block Improves Quality of Pain Control and Preserves Pulmonary Function After Video-Assisted Thoracic Surgery That lung-function advantage is clinically important: patients who breathe better after chest surgery are less likely to develop pneumonia and other respiratory complications.
Cardiac surgery has followed a similar trajectory. A randomized trial of bilateral ESP blocks in patients undergoing open heart surgery found that patients kept pain scores at or below zero on a ten-point scale for the first six hours after extubation and maintained meaningful pain relief for about nine hours on average, nearly double the duration seen in a control group receiving standard intravenous painkillers.6PubMed. Bilateral Erector Spinae Plane Block for Acute Post-Surgical Pain in Adult Cardiac Surgical Patients: A Randomized Controlled Trial A systematic review and meta-analysis of the block in cardiac surgeries confirmed that it reduces opioid requirements during and after surgery, improves pain scores for up to 24 hours, shortens stays in the ICU and hospital, and helps patients get out of bed sooner.7PubMed Central. Erector Spinae Plane Block for Postoperative Analgesia in Cardiac Surgeries- A Systematic Review and Meta-Analysis
Abdominal and Spinal Surgery
The block’s reach extends well below the chest. In abdominal operations, both open and laparoscopic, case series have shown that most patients maintain very low pain scores after surgery, often between zero and two out of ten, with some needing nothing stronger than acetaminophen and none requiring opioid rescue.8PubMed Central. Erector spinae plane block in abdominal surgery: Case series A broader case series across various abdominal procedures confirmed lower opioid use during surgery itself and reduced pain scores persisting through the first 72 hours.9PubMed Central. Erector spinae plane block in various abdominal surgeries: A case series
Spine surgery presents a particular challenge for regional anesthesia because the surgical incision goes through the very muscles where most trunk blocks are placed. Yet the ESP block has proven effective even here. A meta-analysis of twelve studies encompassing nearly 700 patients found that the block decreased postoperative pain scores and opioid consumption, delayed the time before patients first asked for additional painkillers, reduced the number of patients who needed rescue medication at all, and lowered rates of postoperative nausea and vomiting.10PubMed Central. Erector spinae plane block for spinal surgery: a systematic review and meta-analysis A randomized trial specifically in lumbar fusion confirmed these findings, with patients in the block group reporting less pain over the first three postoperative days.11Clinical Spine Surgery. Effect of Lumbar Erector Spinae Plane Blocks After Lumbar Fusion Surgery: A Randomized Control Trial
Quality of recovery, not just pain scores, improves too. A randomized trial of bilateral ESP blocks before posterior lumbar interbody fusion found that patients scored significantly higher on a validated recovery questionnaire at 24 hours, experienced less nausea, used less morphine, and were more satisfied with their pain management.12PubMed Central. Bilateral Erector Spinae Plane Block for Quality of Recovery Following Posterior Lumbar Interbody Fusion: A Randomized Controlled Trial
Rib Fractures and Trauma
Broken ribs make every breath painful, and that pain can spiral into shallow breathing, mucus buildup, and pneumonia. The ESP block has become a go-to intervention in emergency departments and trauma units for exactly this reason. A scoping review of studies on acute rib fractures found a roughly 40% decrease in pain scores within the first 24 hours after the block. Breathing capacity, measured by incentive spirometry, improved as well. Complications were rare: across all the studies, only five cases of hematoma or infection were reported, for an incidence of about 0.6%, and none required further treatment.13PubMed Central. Erector Spinae Plane Block as an Analgesic Intervention in Acute Rib Fractures: A Scoping Review
A retrospective cohort study put numbers on the breathing improvements more precisely. Incentive spirometry volumes nearly doubled in the first day after the block, rising from about 780 mL to about 1,375 mL, and pain scores dropped from around eight out of ten to under five within the first three hours. These improvements held for up to 72 hours, all without causing blood pressure instability.14PubMed. The effect of erector spinae plane block on respiratory and analgesic outcomes in multiple rib fractures: a retrospective cohort study
How It Stacks Up Against Older Techniques
Two well-established alternatives for trunk pain are the paravertebral block, which places anesthetic directly into the paravertebral space beside the spine, and the thoracic epidural, which delivers medication into the epidural space within the spinal canal itself. Both provide excellent pain relief but come with more technical difficulty and higher-stakes complications.
Against the paravertebral block, the ESP block performs comparably for most outcomes. A recent systematic review and meta-analysis found no significant differences between the two in pain scores, quality of recovery, time to first rescue painkiller, length of hospital stay, or rates of nausea and vomiting.15PubMed Central. Paravertebral Block versus Erector Spinae Plane Block for Postoperative Analgesia and Recovery: A Systematic Review and Meta-Analysis A randomized trial in video-assisted thoracic surgery did find that the paravertebral block produced lower pain scores at certain early time points and numbed a wider zone of skin near the breastbone. However, the ESP block met the threshold for non-inferiority overall, and patients who received it had significantly lower blood levels of local anesthetic, which suggests a greater safety margin against drug toxicity.16Regional Anesthesia & Pain Medicine. Comparison of ultrasound-guided erector spinae plane block and thoracic paravertebral block for postoperative analgesia after video-assisted thoracic surgery: a randomized controlled non-inferiority clinical trial
Against the thoracic epidural, the picture is a bit more nuanced. A randomized study in lung cancer patients undergoing thoracotomy found that the epidural provided lower resting pain scores at 24 hours and eliminated the need for postoperative morphine entirely, whereas about half of the ESP block patients still required some morphine. However, the epidural group experienced significantly lower blood pressure during surgery, a known and sometimes dangerous complication of epidural analgesia.17Journal of Cardiothoracic and Vascular Anesthesia. Serratus Anterior Plane Block and Erector Spinae Plane Block Versus Thoracic Epidural Analgesia for Perioperative Thoracotomy Pain Control: A Randomized Controlled Study A pilot trial in rib fracture patients was more favorable for the ESP block: total morphine consumption over 48 hours was virtually identical between the two techniques, but the epidural group had five episodes of hypotension requiring medication while the ESP block group had none.18PubMed Central. Comparison of safety and efficacy of thoracic epidural block and erector spinae plane block for analgesia in patients with multiple rib fractures: A pilot single-blinded, randomised controlled trial
The practical upshot: the ESP block rarely matches the epidural’s peak analgesic power, but it comes remarkably close while avoiding the hemodynamic swings, the risk of spinal hematoma, and the technical complexity that make epidurals unsuitable for many patients, including those on blood thinners.
Extending the Block With Catheters
A single injection of local anesthetic typically provides pain relief lasting somewhere between eight and eighteen hours, depending on the drug and dose used. For surgeries with prolonged recovery, clinicians can thread a thin catheter into the fascial plane and run a continuous infusion of dilute anesthetic for days. In a case series of patients undergoing robotic-assisted thoracic surgery, continuous ESP block catheters were left in place for the first two postoperative days. Only one of eight patients needed any opioids during that period, and none required rescue painkillers.19PubMed Central. Continuous Erector Spinae Plane Block as Postoperative Analgesic Technique for Robotic-Assisted Thoracic Surgery: A Case Series
Catheter techniques have also been used after open abdominal surgery. In one case of intestinal resection and hernia repair, bilateral catheters infusing dilute bupivacaine kept pain scores at one to two out of ten for four days, completely replacing intravenous fentanyl.20American Journal of Case Reports. Continuous Erector Spinae Plane Block for Postoperative Analgesia After Intestinal Resection and Hernia Repair Surgery: A Case Report Continuous infusions are still an emerging application rather than routine practice, but they represent a logical extension of the block’s safety profile into longer hospital stays.
Chronic and Neuropathic Pain
The block was originally described for chronic neuropathic pain, and that application has grown. Herpes zoster, the virus that causes shingles, can leave patients with agonizing nerve pain that persists for months or years after the rash heals. In an observational study of patients with active herpes zoster pain, median pain scores dropped from nine out of ten before the block to 1.5 out of ten immediately after. At three months, pain had settled to a median of one out of ten, and the researchers attributed this sustained improvement to the combination of the block with oral medications.21PubMed Central. Ultrasound-guided Erector Spinae Plane Block for the Management of Herpes Zoster Pain: Observational Study A case report of postherpetic neuralgia that had not responded to standard treatments described nearly complete pain resolution after a single ESP block session, with relief lasting about nine months.22PubMed. Immediate and sustained relief of postherpetic neuralgia with erector spinae nerve block in a 60-year-old woman Combining a selective nerve root block with a continuous ESP block has also shown promise for managing both the acute and chronic phases of shingles-related pain.23PubMed Central. Ultrasound-Guided Selective Thoracic Nerve Root Block Combined with Continuous Erector Spinae Plane Block for Postherpetic Neuralgia: A Case Report
The evidence for chronic pain is still dominated by case reports and small observational studies rather than large trials. Whether the block can produce durable long-term relief on its own, or whether it mainly buys a window during which other therapies can take hold, remains an open question.
Pediatric Use
Children present unique challenges for pain management after surgery. Opioid side effects, from sedation to respiratory depression, are more worrying in smaller bodies. The ESP block has been adapted for pediatric patients across a range of surgeries including chest, abdominal, hip, and femur operations.24PubMed Central. Erector spinae plane block in children: a narrative review A systematic review and meta-analysis of randomized controlled trials concluded that the block provides effective and safe pain relief in children undergoing elective surgery under general anesthesia.25PubMed. Analgesic efficacy and safety of erector spinae plane block in pediatric patients undergoing elective surgery: A systematic review and Meta-analysis of randomized controlled trials The same features that make it attractive in adults, namely clear ultrasound landmarks and a superficial target away from major blood vessels and the spinal cord, make it a particularly reassuring choice in smaller patients where margins for error are thin.
Making the Block Last Longer With Adjuvants
Researchers have been testing whether adding dexamethasone, a steroid, to the local anesthetic can extend the duration of pain relief. The results so far are mixed and appear to depend on the type of surgery. In a randomized trial of patients undergoing total hip replacement, adding dexamethasone to the ESP block nearly doubled the time before patients first needed opioid rescue, from about nine hours in the control group to about sixteen hours in the dexamethasone group.26Journal of Orthopaedics. Perineural dexamethasone enhances analgesic duration of erector spinae plane block in total hip arthroplasty: A randomized quadruple-blind controlled trial But in cardiac surgery patients, adding dexamethasone to ropivacaine for the ESP block did not improve pain scores on the first postoperative day compared with the block alone.27Scientific Reports. Perineural dexamethasone as an adjuvant to erector spinae plane block for acute and chronic pain after cardiac surgery The discrepancy likely reflects how much post-surgical pain is driven by the body wall versus deeper structures: the block covers somatic trunk pain well, and dexamethasone extends that coverage, but when pain also involves deeper visceral sources that the block does not fully reach, the adjuvant has less room to make a difference.
Fitting Into Fast-Track Recovery Programs
Enhanced Recovery After Surgery protocols aim to get patients home faster by minimizing opioids, encouraging early walking, and reducing complications. The ESP block fits neatly into this philosophy. In a propensity-matched study of older, higher-risk patients undergoing minimally invasive lumbar spinal fusion, those who received an ESP block as part of an enhanced recovery protocol used about 25% less morphine equivalent medication, left the hospital about a day and a half sooner, and started walking earlier than matched controls who did not receive the block.28North American Spine Society Journal (NASSJ). Erector Spinae Plane Block within ERAS Protocols Reduces Analgesic Requirements in Aged, High-Risk Patients after MIS-TLIF: A Propensity Score-Matched Analysis
Learning the Technique
One of the block’s selling points is that it is relatively easy to learn. The ultrasound landmarks are unambiguous: the transverse process is a bright, hard-to-miss bony structure, and the erector spinae muscle sits right on top of it. Trainees do not need to identify small nerves or navigate around pleura the way they do with some other trunk blocks. A simulation-based training study found that anesthesia residents significantly improved their speed and accuracy after just two practice attempts, cutting their block time roughly in half and nearly doubling their rate of correctly targeting the plane.29PubMed Central. Simulation-Based Medical Education and Training Enhance Anesthesia Residents’ Proficiency in Erector Spinae Plane Block
The block has also been studied in emergency medicine, where physicians typically have less ultrasound-guided nerve block experience than anesthesiologists. Research found that emergency physicians could reach proficiency in the procedural technique within about six practice attempts.30Annals of Emergency Medicine. Teachability of the Ultrasound-Guided Erector Spinae Plane Block to Emergency Physicians This teachability is part of why the block has spread so quickly beyond anesthesiology departments and into emergency rooms and trauma bays.
The Block in Veterinary Medicine
The ESP block has crossed species lines. Veterinary anesthesiologists have adopted it primarily for dogs undergoing spinal surgery, where postoperative pain management is notoriously difficult. A retrospective study comparing bilateral ESP blocks to continuous fentanyl infusion in dogs undergoing hemilaminectomy found that while a similar proportion of dogs in each group needed at least one rescue dose of fentanyl, those receiving the continuous infusion needed significantly more total rescue doses, especially during lumbar procedures.31PubMed Central. Analgesic efficacy of a bilateral erector spinae plane block versus a fentanyl constant rate infusion in dogs undergoing hemilaminectomy: a retrospective cohort study A prospective randomized trial confirmed this advantage: dogs receiving the ESP block used less fentanyl overall during surgery and had a longer time before needing their first postoperative rescue dose compared with dogs managed with systemic analgesics alone.32PubMed. Erector spinae plane block in dogs undergoing hemilaminectomy: A prospective randomized clinical trial Veterinary applications remain concentrated in specialty referral hospitals, but the same simplicity and safety profile that made the block attractive in human medicine are driving its uptake in animals.