Enhancing Pain Management: The Role of Superior Hypogastric Plexus Block in Chronic Pelvic Pain Treatment

Chronic pelvic pain (CPP) is a complex and often debilitating condition characterized by pain in the pelvic region that persists for 6 months or longer and is not exclusively associated with menstrual cycles, pregnancy, or sexual activity.[ 1 ] It encompasses various underlying causes, including gynecological, urological, gastrointestinal, and musculoskeletal disorders, making its etiology multifactorial and challenging to diagnose. The prevalence of CPP is significant, affecting approximately 15–20% of women worldwide and 8–10% of men.[ 2 ] In clinical practice, CPP is responsible for up to 40% of all gynecological consultations and 10% of referrals to pain clinics, underscoring its substantial burden on healthcare systems. The chronic nature of the condition often leads to significant physical, emotional, and social impairments, making effective management crucial.[ 3 ] The impact of CPP extends beyond physical discomfort, profoundly affecting the quality of life and psychological wellbeing of those who suffer from it. Individuals with CPP often experience difficulties performing daily activities, maintaining employment, and engaging in intimate relationships.[ 3 ] The persistent nature of the pain can lead to feelings of frustration, anxiety, depression, and a sense of helplessness. Furthermore, the unpredictable nature of pain episodes and the lack of a definitive cure contribute to a diminished sense of control and overall life satisfaction. The complexity of CPP necessitates a multifaceted approach to treatment as traditional pain management strategies may not be sufficient for achieving long-term relief.[ 4 ] The superior hypogastric plexus block (SHPB) is an interventional pain management technique that involves the targeted administration of anesthetic agents to the superior hypogastric plexus, a crucial network of nerves located in the retroperitoneal space, anterior to the L5-S1 vertebral bodies. This plexus plays a significant role in transmitting visceral pain signals from the pelvic organs, making it an ideal target for alleviating chronic pelvic pain. By blocking the transmission of these pain signals, SHPB can provide significant relief for individuals suffering from intractable CPP, particularly when other treatment options have failed.[ 5 ] The use of SHPB in pain management has evolved considerably since its initial description in the early 20 th century. Originally employed for pain relief during gynecological surgeries, its application has expanded to include the management of various chronic pain conditions, such as endometriosis, pelvic inflammatory disease, and cancer-related pelvic pain.[ 6 ] Advances in imaging techniques, such as fluoroscopy, computed tomography (CT), and ultrasound, have enhanced the precision and safety of this procedure, making it a viable option for a broader range of patients. Today, SHPB is recognized as an effective and minimally invasive intervention that can significantly improve the quality of life for patients with CPP. The SHPB is a valuable interventional procedure for managing CPP, offering significant relief to patients suffering from a range of underlying conditions. Understanding the types of CPP that respond well to SHPB and establishing clear criteria for patient selection are critical to optimizing treatment outcomes.[ 7 ] Indications for SHPB in CPP management are outlined in Table 1 . Indications for superior hypogastric plexus block in chronic pelvic pain management A thorough preprocedure preparation is crucial before performing an SHPB. The process begins with educating the patient, where the healthcare provider explains the procedure’s purpose, potential risks, and expected outcomes. Obtaining informed consent is essential to ensuring that the patient fully understands the procedure and what to expect.[ 17 ] The techniques and procedures for a superior hypogastric plexus block are outlined in Table 2 . Techniques and procedure for superior hypogastric plexus block Numerous clinical studies have demonstrated the effectiveness of the SHPB in alleviating CPP.[ 27 28 29 ] A significant retrospective study reported substantial improvements in Visual Analogue Scale (VAS) scores, with averages dropping from 8.8 before the procedure to 3.7 at 1 month, 2.2 at 3 months, and 1.1 at 6 months post procedure.[ 30 ] Additionally, the Oswestry Disability Index (ODI), which measures disability due to pain, showed a remarkable reduction, decreasing from 46%—indicative of severe disability—to just 3% at the 6-month follow-up.[ 30 ] In another randomized controlled trial, pre-emptive ultrasound-guided SHPB reduced postoperative morphine consumption by 20% compared to a control group following pelvic cancer surgery, further emphasizing the efficacy of this intervention.[ 31 ] The SHPB not only provides significant pain relief but also promotes functional improvements in patients with chronic pelvic pain. In the studies reviewed, patients exhibited notable reductions in VAS scores, demonstrating effective pain management over short- and long-term periods.[ 32 ] The ODI improvements corroborate these findings as patients transitioned from severe disability to near-normal functioning within 6 months of the procedure. Furthermore, functional outcome measures—including the Timed Up and Go (TUG) test, Berg Balance Scale (BBS), 10-meter walk test, and 6-minute walk test—showed enhancements, irrespective of pain status. These results suggest that SHPB alleviates pain and enhances mobility and overall physical function.[ 32 ] The benefits of SHPB extend beyond pain relief, significantly enhancing the quality of life for patients suffering from chronic pelvic pain. Chronic pain often diminishes the quality of life by affecting psychological wellbeing and social interactions.[ 27 ] By effectively reducing pain and improving functional capacity, SHPB enables patients to regain independence and engage more fully in daily activities and social environments. While the SHPB is widely regarded as a safe and effective procedure for managing CPP, it is not without potential complications. Common issues include infection at the injection site, bleeding, bruising, and nerve damage. Some patients may also experience temporary numbness or weakness following the procedure. Although these side effects are typically minor, more serious complications, such as bowel or bladder dysfunction and hypotension, can occasionally occur. These risks underscore the importance of careful patient selection and diligent monitoring throughout the procedure.[ 33 ] To minimize these risks, several safety protocols should be observed. Appropriate patient selection is crucial; individuals with extensive retroperitoneal disease, which may obscure the plexus, are generally unsuitable candidates as the neurolytic agent might not reach its target effectively.[ 19 ] Utilizing fluoroscopic, ultrasound, or CT guidance during the procedure improves visualization of anatomical structures, reducing the likelihood of injuring nearby tissues. The SHPB has demonstrated significant potential in managing CPP, particularly in cancer-related cases. As the field advances, several promising future directions and research opportunities are emerging that could further improve the efficacy and broaden the application of this technique.[ 34 ] Recent innovations in imaging and needle guidance have greatly enhanced the safety and precision of SHPB procedures. The introduction of ultrasound-guided techniques enables real-time visualization during needle placement, reducing radiation exposure and increasing accuracy. This advancement not only boosts the chances of successful outcomes but also minimizes the risk of injury to surrounding structures such as blood vessels and organs. Additionally, newer approaches like transdiscal techniques offer alternative access routes to the SHP, eliminating the need for patients to lie prone.

In conclusion, the SHPB represents a promising interventional option for managing CPP, particularly in cases where conventional pharmacological and nonpharmacological treatments have proven inadequate. By targeting the complex network of nerves responsible for transmitting visceral pain from the pelvic organs, SHPB offers a focused and effective means of pain relief, addressing a critical gap in the current management of CPP. There are no conflicts of interest.