Although complex regional pain syndrome has been a recognized entity for over 100 years, no clear evidence exists for first-line treatments; however, new technologies that are applicable in complex regional pain syndrome treatment have been developed.

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Background: The superior hypogastric plexus block has been indicated for visceral pelvic pain treatment associated with malignancy. The first international report of this technique was published by Plancarte et al, in which a posterior percutaneous approach guided by fluoroscopy was described by applying neurolytic agents. The considerable variability in the data reported gave rise to 2 clinical approaches to those who performed the blockade early and those who executed it at a later stage of cancer. Objectives: The present study aims to provide more evidence regarding the effectiveness of this procedure. Study Design: This is a retrospective, longitudinal, descriptive study. Setting: The study was held at the pain unit service of the National Cancer Institute, Mexico City. Methods: A nonprobabilistic sample was selected; the data collection took place from January 2006 to December 2016 with patients diagnosed with pelvic pain, confirmed by imaging and biopsy studies. Patients who received any other type of intervention of the sympathetic axis, patients with a different approach than the classic or paravertebral technique, and patients with low survival rate were excluded. The Student t test was used to measure the significant difference between Visual Analog Scale (VAS) and morphine equivalent daily dose. The Cochran–Mantel– Haenszel test and the Gamma test were used to measure the association between the initial Karnofsky and blockade success. Results: The study included a total of 180 patients. The success rate was 59.4% at 1 month, 55.5% at 3 months, and 48.8% at 6 months. There was a sustained and significant VAS reduction that was 49.55% at 3 months. A significant reduction in opioid consumption of 12.55% was found at 3 months. There was no significant statistical evidence related to either opioid consumption or the functionality of the patient before the blockade as an influential variable in the success of the procedure. Limitations: Retrospective study, developed in a single center. Conclusions: Although opioids remain the cornerstone of cancer pain treatment, they produce many deleterious side effects. The superior hypogastric plexus neurolysis represents a reproducible and effective alternative in the management of pain in this group of patients. Key words: Pelvic pain, neoplasms, chemical neurolysis, pain management, cancer pain, palliative care, analgesia, nerve block

Objective Vertebroplasty is a percutaneous minimally invasive procedure indicated for vertebral collapse pain treatment. Among the known complications of the procedure is the augmented risk of new vertebral fractures. There are no specific studies in this patient population describing the risk of new vertebral fractures after vertebroplasty. This study analyzed risk factors associated with new vertebral fractures after vertebroplasty in patients with multiple myeloma. Methods Observational retrospective study in patients with multiple myeloma. The data collection took place from January 1, 2010, to December 30, 2017, at the National Cancer Institute. Clinical data and procedural variables such as cement volume, cement leaks, fracture level, number of treated vertebrae, pedicular disease, and cement distribution pattern, with two years follow-up, were analyzed with the Wilcoxon test, and a logistic regression model was used to identify risk factors related to new vertebral fractures. A confidence interval of 95% was used for analysis. Results At one-year follow-up, 30% of fractures were reported after vertebroplasty, most of them at low thoracic and lumbar level (50% adjacent level). Vertebroplasty was most commonly performed at the thoracolumbar and lumbar area. We demonstrated a 70.7% median numerical rating scale reduction at one-year follow-up; a significant decrease in opioid consumption occurred only during the first month. Conclusions Pedicle involvement, disc leakage, cement volume, thoracolumbar and lumbar level, and number of treated vertebrae by intervention are important risk factors when performing vertebroplasty. Prospective randomized studies are needed to evaluate these factors in this specific population.