An interventional study of thoracic paravertebral block (TPVB) and PECS group in Paravertebral Block, Pectoral Nerve Block and Chronic Pain, sponsored by Assiut University. Recruiting at 1 site in Egypt. Open to female participants aged 20 Years to 65 Years. Per ClinicalTrials.gov, last updated 2026-07-06.
Sponsored by Assiut University · Not applicable, Interventional, and Treatment
Chronic pain after Mastectomy is frequent and an important healthcare priority because of its effect on quality of life. Although the association between the severity of acute pain after surgery and the likelihood of chronic pain is known, their causal relationship has not been clarified. Mastectomy, frequently done for the management of breast cancer, is associated with significant acute postoperative pain and limited shoulder movement.
General anesthesia with postoperative NSAI D and opioids is a commonly used technique for postoperative analgesia after breast surgeries. Patients with mastectomy under general anesthesia commonly have pain in the axilla and upper limb that increases hospital stay, costs, and postoperative complications .Thoracic paravertebral block can be performed for analgesia after breast surgery. Ultrasound usage gave an accurate reading of the depth to the paravertebral space and can be used during the whole technique. Breast surgery is usually done with axillary dissection and can be done at single or multiple levels of thoracic paravertebral blocks .Thoracic paravertebral block is associated with multiple complications such as hypotension, pneumothorax, sympathetic block, central spread of local anesthesia or failed block which may cause limitations in the technique. The use of ultrasound in anesthesia increases the success rate of the block and decreases the incidence of variable complications .On the other hand, many interfascial plane blocks have been described. Pectoral nerve block (PECS) has been described as interfascial plane blocks and provide analgesic adjuvants for breast surgery with or without axillary dissection. The block was described as an injection of local anesthetic between the pectoralis major and minor muscles (PEC I) and between pectoralis minor and serratus anterior muscle (PEC 2) .
3,227 studies on the registry are indexed under Chronic Pain; 729 are open to participants now.
This study's planned enrollment of 90 is above the median of 60 across 2,388 interventional studies indexed under Chronic Pain.
Browse Chronic Pain studies →Assiut University is the lead sponsor of 5,078 studies on the registry; 2,178 are open to participants now.
Of its 14 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bupivacaine 0.25% 20 ml was injected between the costotransverse ligament and the parietal pleura.
Procedure: thoracic paravertebral block (TPVB)
10 mL of 0.25% bupivacaine between the pectoralis major and minor muscles. and 10 mL of 0.25% bupivacaine between the pectoralis minor and serratus anterior muscles at the level of the 4th rib.
Procedure: PECS group
Bupivacaine 0.25% 20 ml was injected between the costotransverse ligament and the parietal pleura.
entering the plane between the pectoralis minor muscle and serratus anterior muscle, and bupivacaine 0.25% 20 ml was deposited in this space
The incidence of chronic pain
The incidence of chronic pain, with a Douleur Neuropathique 4 (DN4) questionnaire score ≥ 4, indicating neuropathic pain.
Time frame: 3 and 6 months
Plan to share: Undecided
Started Nov 2023 (actual). Primary completion is estimated for Aug 2026, 33 months after the start.
Of 1,295 non-industry interventional studies with no phase under Chronic Pain, half reached primary completion within 20 months of starting (the median), counting those still running; a quarter within 9 and three quarters within 39. This study's planned 33 months is above that.
Counting every sponsor, half of 1,378 studies reached it within 20 months; a quarter within 9 and three quarters within 38.
How these figures are worked out, and which studies are left out of them.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.