This clinical trial aims to evaluate the effectiveness of the ultrasound-guided erector spinae plane (ESP) block in managing postoperative pain for patients undergoing open nephrectomy (kidney removal surgery). The study will compare this new technique to traditional pain management methods, such as opioid medications, to assess whether the ESP block reduces pain and the need for opioids after surgery.

Patients will be randomly assigned to one of two groups:

Group C will receive conventional pain relief methods, including opioids. Group E will receive the ultrasound-guided ESP block in addition to general anesthesia.

The main goals are to determine:

How much pain relief each method provides, measured using a visual analog scale (VAS).

The total amount of opioids required during the first 24 hours post-surgery.

Additional measurements will include monitoring vital signs like heart rate, blood pressure, and oxygen levels.

This study will help find safer and more effective ways to manage pain after nephrectomy, reducing the reliance on opioids and improving patient recovery

This randomized controlled trial aims to assess the efficacy of ultrasound-guided erector spinae plane (ESP) block in managing postoperative pain in patients undergoing open nephrectomy. Nephrectomy, a common procedure for kidney removal, often results in severe postoperative pain, which can contribute to complications such as postoperative pulmonary complications (PPC) and delayed recovery. Traditional analgesic techniques, including systemic opioids and epidural analgesia, have various side effects such as nausea, vomiting, constipation, and respiratory depression. Additionally, opioids may lead to tolerance, especially in cancer patients. Erector spinae plane block (ESP) is a newer regional technique that has gained attention due to its potential to provide effective analgesia with minimal side effects.

This study will evaluate whether the ESP block can provide better pain control and reduce opioid consumption compared to conventional pain management techniques. The ESP block targets the erector spinae muscle and provides analgesia via fascial plane blocks, which is believed to be effective in controlling visceral and somatic pain, typically associated with nephrectomy.

The trial will involve 66 adult patients scheduled for open nephrectomy under general anesthesia. Patients will be randomly assigned to one of two groups:

Control Group (Group C): Patients will receive conventional analgesia, including opioids and standard local anesthetic techniques.

Intervention Group (Group E): Patients will receive general anesthesia combined with the ultrasound-guided ESP block, administered immediately before anesthesia induction.

The primary outcome of the trial is to measure the first postoperative opioid requirement, utilizing the Visual Analogue Scale (VAS) for pain assessment. Secondary outcomes include the total opioid consumption in the first 24 hours, the intensity of postoperative pain at various time points, and the hemodynamic responses (heart rate, blood pressure). Additionally, peak expiratory flow rate (PEFR) will be monitored to assess respiratory function as part of the recovery process.

By evaluating these outcomes, the study aims to provide insights into whether ESP block can serve as a safer, effective alternative to traditional analgesia, improving postoperative pain management and reducing the risks associated with opioid use. The results may guide clinical practice in nephrectomy pain management, offering a potential improvement in patient recovery times and satisfaction.

Inclusion Criteria:

• Adult patients aged 18 to 64 years
• Scheduled for open nephrectomy (radical or partial) under general anesthesia
• ASA physical status I-II (American Society of Anesthesiologists classification)

Exclusion Criteria:

• Allergy to local anesthetics.
• Local infection or inflammation at the site of the Block placement.
• Presence of anatomical deformities in the spine
• Coagulopathy or any bleeding disorder.
• Pregnancy or breastfeeding women.
• History of severe chronic pain syndrome