{"id":54994,"date":"2026-06-11T09:00:00","date_gmt":"2026-06-11T07:00:00","guid":{"rendered":"https:\/\/campusvygon.com\/global\/?p=54994"},"modified":"2026-06-11T18:51:00","modified_gmt":"2026-06-11T16:51:00","slug":"pre-procedural-ultrasound-in-spinal","status":"publish","type":"post","link":"https:\/\/campusvygon.com\/global\/pre-procedural-ultrasound-in-spinal\/","title":{"rendered":"Pre-procedural ultrasound in spinal anesthesia: From clinical necessity to complication reduction in at-risk patients"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>What is the challenge of performing spinal anesthesia when anatomical landmarks are impalpable?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Spinal anesthesia traditionally relies on palpable surface landmarks to guide needle insertion. In obese patients (BMI &gt; 35) or patients with spinal deformities (scoliosis, kyphosis, prior spinal surgery), these<strong> landmarks often become unreliable, increasing technical difficulty<\/strong>, prolonging the procedure, and raising the probability of multiple puncture attempts which can lead to <strong>complication such as post\u2011dural puncture headaches<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For instance, data from the United Kingdom show that about 15% of spinal anesthetics are technically challenging, 10% require more than five attempts, and failure of central neuraxial block (CNB; spinal and epidural) may occur in roughly 5% of patients under 50 years of age. <em>(1)<\/em><\/p>\n\n\n\n<div style=\"height:51px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How do multiple puncture attempts increase the risk of complications in spinal anesthesia?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Multiple puncture attempts mechanically increase tissue trauma, raise the likelihood of dural puncture, and significantly elevate the risk of<a href=\"https:\/\/campusvygon.com\/global\/preventing-post-dural-puncture-headache-pdph\/\" data-type=\"link\" data-id=\"https:\/\/campusvygon.com\/global\/preventing-post-dural-puncture-headache-pdph\/\"> post dural puncture headache (PDPH)<\/a>. <strong>Patients with difficult anatomy<\/strong> (obesity, scoliosis, or prior surgery) <strong>have markedly<\/strong> <strong>higher first attempt failure rates<\/strong>, making complication prevention essential.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Key mechanisms linking repeated attempts with complications<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Higher PDPH risk:<\/strong> PDPH incidence rises with each additional puncture. <em>(2)<\/em><\/li>\n\n\n\n<li><strong>Soft\u2011tissue injury:<\/strong> Repeated needle attempts may cause damage to the soft tissue structures along the path of needle insertion. <em>(1)<\/em><\/li>\n\n\n\n<li><strong>Radicular pain or <a href=\"https:\/\/www.rcoa.ac.uk\/patients\/patient-information-resources\/anaesthesia-risk\/nerve-damage-after-spinal-or-epidural-anaesthetic\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/www.rcoa.ac.uk\/patients\/patient-information-resources\/anaesthesia-risk\/nerve-damage-after-spinal-or-epidural-anaesthetic\" rel=\"noreferrer noopener\">paresthesia<\/a>:<\/strong> Needle misdirection can irritate nerve roots, producing transient symptoms.<\/li>\n\n\n\n<li><strong>Greater procedural pain:<\/strong> Repeated needle redirection correlates with increased perioperative discomfort.<\/li>\n\n\n\n<li><strong>Higher likelihood of block failure:<\/strong> Distorted trajectories reduce chances of intrathecal placement.<\/li>\n\n\n\n<li><strong>Delays in care:<\/strong> Failed attempts prevent successful anesthetic injection, prolonging anesthesia induction and delaying the start of surgery.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The occurrence of <strong>complications is influenced by needle type, gauge, patient characteristics<\/strong> (age, anatomy),<strong> and operator experience<\/strong>.<\/p>\n\n\n\n<div style=\"height:49px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How does difficult anatomy contribute to first\u2011attempt failure?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Obesity, scoliosis, kyphosis, and post\u2011surgical alterations distort expected surface landmarks,<strong> increasing the probability of missed midline and incorrect depth estimation.<\/strong> These factors multiply first\u2011attempt failure rates compared with normal anatomy. <em>(1) (5)<\/em><\/p>\n\n\n\n<div style=\"height:52px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What is pre\u2011procedural ultrasound and how does it help?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pre\u2011procedural ultrasound (PPU) is a <strong>brief ultrasound assessment performed before inserting the spinal needle<\/strong>. It is used to identify the optimal intervertebral space, measure the exact depth to the intrathecal space, and determine the most appropriate needle trajectory. Unlike real\u2011time ultrasound guidance,<strong> PPU requires only anatomical identification and skin marking, making it easier to implement while offering substantial reductions in failed or repeated attempts<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What Pre\u2011procedural ultrasound (PPU) provides:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Accurate vertebral level selection<\/strong>, which often differs from estimates based solely on palpation.<\/li>\n\n\n\n<li>Precise depth measurement from skin to intrathecal space to<strong> improve needle choice and trajectory<\/strong>.<\/li>\n\n\n\n<li><strong>Trajectory guidance<\/strong>, helping decide between a midline or paramedian approach based on anatomical feasibility.<\/li>\n\n\n\n<li>Skin marking, enabling a single, targeted insertion point that <strong>reduces redirections and tissue trauma<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Quantified benefit<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Evidence from 22 studies shows that ultrasound-assisted techniques consistently rank higher in first-pass success compared with the traditional landmark approach. <strong>Ultrasound-assisted methods show a substantially higher ranking (SUCRA 67.1%), while the landmark method ranks lowest (0.1%)<\/strong>. SUCRA (Surface Under the Cumulative Ranking Curve) is a probabilistic measure derived from network meta-analysis, ranging from 0 to 100%, which reflects the likelihood of a technique being among the most effective, rather than its absolute clinical success rate. <em>(1)<\/em><\/p>\n\n\n\n<div style=\"height:51px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Evidence in obese patients: how much does ultrasound improve outcomes?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ultrasound guidance significantly reduces the number of puncture attempts, lowers procedural pain, and improves first\u2011pass success in obese patients. The comparative study below shows consistent superiority of ultrasound across nearly all metrics. <em>(4)<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Comparison of Landmark vs. Ultrasound Guidance in Obese Patients<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Outcome<\/strong><\/td><td><strong>Landmark<\/strong><\/td><td><strong>&nbsp;Ultrasound Guindance<\/strong><\/td><td><strong>p value<\/strong><\/td><td><strong>Finding<\/strong><\/td><\/tr><tr><td><strong>Lumbar puncture time (min)<\/strong><\/td><td>18.43 \u00b1 1.06<\/td><td>7.53 \u00b1 0.95*<\/td><td>0.000<\/td><td>Ultrasound dramatically shortens procedure time<\/td><\/tr><tr><td><strong>Puncture attempts (n)<\/strong><\/td><td>2.67 \u00b1 1.49<\/td><td>1.13 \u00b1 0.35*<\/td><td>0.000<\/td><td>Fewer attempts with ultrasound<\/td><\/tr><tr><td><strong>First attempt success (n)<\/strong><\/td><td>15\/30<\/td><td>26\/30*<\/td><td>0.005<\/td><td>First attempt success nearly doubles<\/td><\/tr><tr><td><strong>Total first attempt success rate (n)<\/strong><\/td><td>27\/30<\/td><td>30\/30<\/td><td>0.237<\/td><td>not significant (p \u2265 0.05)<\/td><\/tr><tr><td><strong>Bloody cerebrospinal fluid (n)<\/strong><\/td><td>9\/30<\/td><td>2\/30*<\/td><td>0.042<\/td><td>Less traumatic puncture<\/td><\/tr><tr><td><strong>Intraprocedural sciatic nerve irritation (n)<\/strong><strong><\/strong><\/td><td>5\/30<\/td><td>1\/30<\/td><td>0.195<\/td><td>not significant (p \u2265 0.05<\/td><\/tr><tr><td><strong>Post\u2011procedural low\u2011back pain (n)<\/strong><strong><\/strong><\/td><td>8\/30<\/td><td>1\/30*<\/td><td>0.026<\/td><td>Clear reduction in post\u2011procedure pain<\/td><\/tr><tr><td><strong>Post\u2011procedural (n)<\/strong><strong><\/strong><\/td><td>2\/30<\/td><td>0\/30<\/td><td>0.492<\/td><td>not significant (p \u2265 0.05<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">* <em>Statistically significant difference compared with Group A (p &lt; 0.05).<\/em><\/p>\n\n\n\n<div style=\"height:51px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In obese patients, <strong>ultrasound guidance reduces puncture attempts by more than half<\/strong>, cuts procedure time by over 50%, and doubles the first attempt success rate while lowering pain and traumatic puncture markers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Is ultrasound beneficial in spinal deformities?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. In severe scoliosis or achondroplastic dwarfism, where palpation landmarks are absent, ultrasound greatly facilitates correct needle placement, particularly using the transverse plane<ins>.<\/ins> <em>(5)<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>When ultrasound is particularly useful<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rotational deformity<\/li>\n\n\n\n<li>Congenital abnormalities<\/li>\n\n\n\n<li>Post\u2011laminectomy anatomy<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>When should clinicians use pre\u2011procedural ultrasound?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PPU is most relevant when anatomical difficulty is expected.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Body Mass Index (BMI) &gt; 35<\/li>\n\n\n\n<li>Prior lumbar surgery<\/li>\n\n\n\n<li>Scoliosis or kyphosis<\/li>\n\n\n\n<li>Previous landmark\u2011based failure<\/li>\n\n\n\n<li>Elderly patients<\/li>\n<\/ul>\n\n\n\n<div style=\"height:51px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Patient and organizational benefits: how much does ultrasound improve satisfaction?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ultrasound guidance not only reduces complications and procedural pain, but also significantly <strong>increases overall patient satisfaction<\/strong>, as demonstrated by the comparison of satisfaction scores between landmark and ultrasound\u2011guided groups. <em>(4)<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a id=\"_msocom_1\"><\/a><a id=\"_msocom_1\"><\/a><strong>Comparison of patient satisfaction (Landmark vs. Ultrasound)<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Group<\/strong><\/td><td><strong>n<\/strong><\/td><td><strong>Very satisfied<\/strong><\/td><td><strong>Satisfied<\/strong><\/td><td><strong>Dissatisfied<\/strong><\/td><td><strong>Total satisfaction (%)<\/strong><\/td><\/tr><tr><td><strong>Landmark<\/strong><\/td><td>30<\/td><td>11<\/td><td>7<\/td><td>12<\/td><td>60%<\/td><\/tr><tr><td><strong>Ultrasound<\/strong><\/td><td>30<\/td><td>20<\/td><td>6<\/td><td>4<\/td><td>86.7%*<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">* <em>Statistically significant improvement compared with Group A (p &lt; 0.05).<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ultrasound guidance increases total patient satisfaction from 60% to 86.7%, driven by fewer puncture attempts, less procedural pain, and lower complication rates.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Decision support: When ultrasound&nbsp;is high recommended:<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"1000\" src=\"https:\/\/campusvygon.com\/global\/wp-content\/uploads\/sites\/10\/2026\/06\/infographic-PPU.jpg\" alt=\"Infographic titled \u201cWhen pre-procedural ultrasound should be prioritized\u201d showing a two-column table. The left column lists patient profiles (BMI greater than 35, prior lumbar surgery, severe scoliosis, elderly, normal anatomy) and the right column provides recommended approaches, including strong recommendation for pre-procedural ultrasound (PPU) in higher-risk patients and optional use in patients with normal anatomy.\" class=\"wp-image-55003\" style=\"width:622px;height:auto\" srcset=\"https:\/\/campusvygon.com\/global\/wp-content\/uploads\/sites\/10\/2026\/06\/infographic-PPU.jpg 800w, https:\/\/campusvygon.com\/global\/wp-content\/uploads\/sites\/10\/2026\/06\/infographic-PPU-480x600.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/statics.teams.cdn.office.net\/evergreen-assets\/safelinks\/2\/atp-safelinks.html\" target=\"_blank\" rel=\"noopener\">Download here<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong> <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pre\u2011procedural ultrasound addresses the core challenge of spinal anesthesia when anatomical landmarks are unreliable, offering a clearer understanding of spinal anatomy before needle insertion. The evidence shows that multiple puncture attempts increase the likelihood of complications and patient discomfort, highlighting the importance of improving first\u2011attempt accuracy. Difficult anatomies are major contributors to technical failure, and in these cases ultrasound provides essential anatomical clarification. By identifying the correct intervertebral space, estimating depth, and defining the appropriate trajectory, ultrasound reduces&nbsp;first attempt and the risks associated with them. Studies in obese patients and those with spinal deformities demonstrate that ultrasound improves procedural success and patient experience. While the landmark technique remains appropriate for patients with normal anatomy, ultrasound serves as a valuable safety tool in complex situations. Overall, the conclusions across all sections support integrating pre\u2011procedural ultrasound into clinical practice to enhance safety, efficiency, and patient satisfaction in spinal anesthesia.<\/p>\n\n\n\n<div style=\"height:49px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Bibliography<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. NYSORA<\/strong><br>NYSORA. (n.d.). <em>Ultrasound<\/em>\u2011<em>guided central neuraxial blocks: The evidence.<\/em> Retrieved from<br>https:\/\/www.nysora.com\/pain-management\/ultrasound-guided-central-neuraxial-blocks\/#toc_14&#8211;THE-EVIDENCE<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Al\u2011Hashel, Rady, Massoud &amp; Ismail (2022)<\/strong><br>Al-Hashel, J., Rady, A., Massoud, F., &amp; Ismail, I. I. (2022). Post-dural puncture headache: A prospective study on incidence, risk factors, and clinical characterization of 285 consecutive procedures. <em>BMC Neurology, 22<\/em>(1), 261. https:\/\/doi.org\/10.1186\/s12883-022-02785-0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Zhang, Peng, Wei et al. (Systematic Review \/ Network Meta\u2011analysis)<\/strong><br>Zhang, Y., Peng, M., Wei, J., et al. (Year not provided). <em>Comparison of ultrasound\u2011guided and traditional localisation in intraspinal anesthesia: A systematic review and network meta\u2011analysis.<\/em> <em>BMJ Open.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. Li, Tao &amp; Cai (2022)<\/strong><br>Li, L., Tao, W., &amp; Cai, X. (2022). Ultrasound-guided vs. landmark-guided lumbar puncture for obese patients in the emergency department. <em>Frontiers in Surgery, 9<\/em>, 874143. https:\/\/doi.org\/10.3389\/fsurg.2022.874143<strong>5. Kilicaslan (2023)<\/strong><br>Kilicaslan, B. (2023). Ultrasound-guided spinal anaesthesia in a patient with achondroplastic dwarfism and scoliosis: A case report. <em>Hong Kong Medical Journal, 29<\/em>, 459\u2013461.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a id=\"_msocom_1\"><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Proper handling and organization of ultrasound probes ensure efficiency and hygiene in clinical practice.<\/p>\n","protected":false},"author":141,"featured_media":55005,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[919,80],"tags":[1113],"class_list":["post-54994","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-anaesthesia-and-intensive-care","category-articles","tag-anesthesia"],"acf":[],"_links":{"self":[{"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/posts\/54994","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/users\/141"}],"replies":[{"embeddable":true,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/comments?post=54994"}],"version-history":[{"count":9,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/posts\/54994\/revisions"}],"predecessor-version":[{"id":55056,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/posts\/54994\/revisions\/55056"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/media\/55005"}],"wp:attachment":[{"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/media?parent=54994"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/categories?post=54994"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/campusvygon.com\/global\/wp-json\/wp\/v2\/tags?post=54994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}