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NCT Number: NCT06900842

Chronic Pain in Post-Mastectomy Patients; The Difference Between Pectoral Nerve (PECS I-II) and Erector Spinal Plane (ESP) Blocks

This study looks at two types of injections (called PECS and ESP blocks) to see which one works better for reducing pain after breast cancer surgery (mastectomy).

The main question it asks is: Which block is better at reducing pain after surgery - PECS or ESP? Women who had this surgery and received one of the two blocks were followed for three months. We looked at how much pain they felt, how much pain medication they needed, and whether they still had pain months later.

The results showed that both blocks helped with pain right after surgery. The ESP block lasted a little longer at first, but in general, both groups needed about the same amount of pain medicine. Three months later, about half of the patients still had some pain - especially those who had more extensive surgery or had nerve pain early on. There was no big difference between the two blocks when it came to long-term pain.

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Key information

Conditions

Breast Cancer Surgery Bites and Stings Breast Diseases Breast Neoplasms Chemically-Induced Disorders Chronic Pain Erector Spine Plane Block Mastectomy Neoplasms Neoplasms by Site Nervous System Diseases Neuralgia Neurologic Manifestations Neuromuscular Diseases Neuropathic Pain Pain Pain, Postoperative Pathologic Processes Pathological Conditions, Signs and Symptoms Pectoral Nerve (PECS) Block Peripheral Nervous System Diseases Poisoning Post-mastectomy Pain Syndrome Postoperative Complications Postoperative Pain, Acute Postoperative Pain, Chronic Quality of Life (QOL) Regional Anesthesia Signs and Symptoms Skin Diseases Skin and Connective Tissue Diseases Wounds and Injuries

Age range

18 year–65 year

Sex eligibility

Female

Study type

Observational

Primary location

Hacettepe University Hospital

Ankara, 06230, Turkey (Türkiye)

About this study

Despite advancements in breast cancer treatment, chronic postoperative pain-known as post-mastectomy pain syndrome (PMPS)-remains a common complication, with reported rates between 40-50%. It is typically neuropathic in nature and linked to factors such as axillary lymph node dissection, radiotherapy, and high levels of acute postoperative pain. Younger patients are at higher risk, and early neuropathic symptoms may predict long-term pain.

Regional anesthesia techniques, including PECS and erector spinae plane (ESP) blocks, are widely used to improve perioperative pain control and potentially reduce the incidence of chronic pain. These techniques are considered effective and low-risk adjuncts to general anesthesia.

This prospective observational study compares the impact of PECS I-II and ESP blocks on chronic pain development in patients undergoing modified radical mastectomy (MRM). The primary outcome is the incidence of pain at 3 months postoperatively (NRS ≥1). Secondary outcomes include acute pain scores, intraoperative fentanyl use, postoperative morphine requirements, and time to first analgesic. The study also explores associations between chronic pain and variables such as lymph node dissection, radiotherapy.

Findings aim to guide clinical practice in selecting regional anesthesia techniques that provide both immediate and long-term pain relief.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Scheduled to undergo modified radical mastectomy due to breast cancer
  • Decision to perform PECS I-II or ESP block made independently from the study, as part of standard pain management
  • Aged between 18 and 65 years
  • American Society of Anesthesiologists (ASA) physical status classification I or II
  • Female

Exclusion criteria

  • Inability to perform the block (e.g., coagulation disorder, allergy to local anesthetics, infection at the injection site)
  • Obesity (Body Mass Index > 35 kg/m²)
  • Pre-existing neurological deficits
  • Younger than 18 or older than 65 years
  • ASA physical status classification III or IV
  • Refusal to give informed consent

Treatment and study plan

Primary outcomes

  1. Incidence of Chronic Postoperative Pain (NRS ≥1)

    Time frame: 3 months after surgery

    The presence of chronic pain will be evaluated at 3 months postoperatively using the Numeric Rating Scale (NRS). Patients reporting a score of ≥1 will be considered to have chronic postoperative pain. This measure aims to assess the long-term effectiveness of PECS I-II and ESP blocks in reducing chronic pain following mastectomy.

Secondary outcomes

  1. Postoperative Acute Pain Scores (NRS)

    Time frame: At 20 minutes, 6 hours, and 24 hours after surgery

    Pain intensity will be measured using the Numeric Rating Scale (0-10). Scores will be compared between the PECS and ESP groups to evaluate differences in early postoperative pain control.

  2. Total Postoperative Opioid Consumption (Morphine, mg)

    Time frame: Within 24 hours after surgery

    The total amount of intravenous morphine consumed via patient-controlled analgesia (PCA) pump will be recorded and compared between groups to assess analgesic requirements.

  3. Time to First Analgesic Requirement

    Time frame: Within 24 hours after surgery

    The time interval from the end of surgery to the patient's first request for opioid analgesia will be recorded in minutes. This outcome reflects the duration of initial analgesia provided by the block.

  4. Postoperative Quality of Life (SF-12 Score)

    Time frame: 3 months after surgery

    The SF-12 Health Survey will be used to assess the physical and mental components of quality of life. Results will be compared between groups and correlated with chronic pain presence.

  5. Presence of Neuropathic Pain (DN4 Score > 4)

    Time frame: At 20 minutes, 6 hours, 24 hours, and 3 months after surgery

    In patients with NRS > 0, the DN4 (Douleur Neuropathic 4) questionnaire will be used to assess the presence of neuropathic pain. Scores > 4 indicate neuropathic pain.

Sponsors and collaborators

Lead sponsor

Hacettepe University

Other

Registry information

Official study title

Chronic Pain in Mastectomy Patients; The Difference Between Pectoral Nerve Block (PECS I-II) and Erector Spinal Plane (ESP) Block

Important dates

Study start
2024
Primary completion
2024
Study completion
2024
First posted
Mar 28, 2025
Registry last updated
Mar 28, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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