Postoperative pain management is essential, and the perineural catheter plays a key role in this area. This device, a tube placed near the nerves, continuously delivers a local anesthetic to relieve moderate to severe pain after surgery, without requiring constant patient intervention.

In this guide, we discuss the role of the perineural catheter in postoperative analgesia, the types of catheters, the insertion procedure, monitoring, and removal of the device. It is particularly aimed at Registered Nurses (RNs), who are essential in the monitoring and management of patients with perineural catheters, especially in home care settings.

Understanding the practical and clinical details of this device is essential for effective analgesia and a quality patient experience.

Understanding the Role of the Perineural Catheter in Analgesia

What is a Perineural Catheter?

The catheter A perineural catheter is a small polyethylene tube inserted under the skin, with its tip positioned near the nerve targeted for nerve supply to a specific painful area. It is used for the continuous administration of local anesthetics, either via an elastomeric diffuser, often called a "bottle," or through a programmable pump. This method of regional analgesia is ideal for long-term pain relief, ranging from several days to weeks. The Importance of Perineural Catheters in Pain Management: The use of perineural catheters plays an important role in the control of postoperative and chronic pain. They offer multiple advantages, notably by providing continuous and effective analgesia, which reduces the need for intravenous morphine medications and minimizes the side effects associated with these drugs. This technique improves the quality of analgesia, enhances patient satisfaction, and contributes to faster post-surgical rehabilitation. Perineural catheters are also well-suited for home or outpatient care, a significant advantage with the shift towards outpatient surgery. Research indicates that their use outside the hospital promotes better postoperative pain management, improved sleep quality, and greater patient satisfaction, while reducing the need for additional medications and side effects. The accuracy and reliability of perineural catheters in pain management make them an indispensable tool for anesthesiologists and care teams. They allow treatment to be tailored to each patient's unique needs.

The different types of perineural catheters

Catheters for peripheral nerve blocks

Perineural catheters, used for peripheral nerve blocks, specifically target the nerves of the upper and lower limbs. They come in two main types:

• Needle-over-catheter (NAC): This type of catheter is placed through an indwelling catheter once the needle is removed. Prized for its ease of use, similar to that of intravenous access, it ensures better stability, reduces the risk of catheter kinking and minimizes leakage, optimizing treatment efficacy. Catheter-through-the-needle (CTA): Here, the catheter is inserted directly through the needle, allowing for deeper positioning closer to the nerve sheath. Although it offers prolonged analgesia and a reduced risk of displacement, this method requires superior technical expertise and carries a higher risk of catheter kinking.

These catheters can be used with different types of needles, such as short-bevel needles or Tuohy bevel needles, and are often coupled with neurostimulation systems for precise nerve localization.

Catheters for Central Blocks

Perineural catheters are primarily intended for peripheral blocks, but it is essential to emphasize that central block techniques, such as epidural or spinal analgesia, require specific catheters. Unlike catheters for peripheral blocks, those used for central blocks are inserted into the epidural or subarachnoid space, thus targeting central regions of the nervous system with a distinct method and expertise. Nevertheless, our focus remains on peripheral nerve block catheters, essential for providing effective localized analgesia during limb surgeries and other peripheral procedures. Perineural Catheter Insertion Procedure Preparation and Required Materials Before inserting a perineural catheter, it is essential to verify the availability of the required materials and to adequately prepare the patient. These materials include the perineural catheter, guide needle, local anesthetics, antiseptics, sterile gloves, and a surgical mask and cap to maintain sterility. It is also important to ensure that the patient has no contraindications to local anesthetics and that monitoring and resuscitation equipment is readily available in case of complications. Insertion Techniques: The insertion of the perineural catheter involves several key steps to ensure safe and precise placement. Positioning the needle within the perineural space is achieved using ultrasound, neurostimulation, or hydrolocalization, accurately targeting the local anesthetic infusion site. Confirmation of correct placement is achieved by injecting a small amount of local anesthetic, facilitating catheter insertion by creating space around the nerve structures. The catheter is then inserted, ensuring that it advances smoothly along the nerve to the desired position. After catheter placement, the needle is carefully withdrawn, and the catheter is secured to the skin to prevent displacement. Risk and Complication Management: It is important to recognize the potential risks and complications associated with the use of perineural catheters. The risk of infection is increased if the catheter remains in place for more than 48 hours or in the absence of antibiotic prophylaxis; therefore, strict aseptic technique and monitoring for signs of infection are essential. Technical complications such as leaks, dislodgement, and analgesia failures require regular checks of the catheter and infusion system. Systemic toxicity from the local anesthetic, affecting the central nervous system and the heart, as well as direct or compression nerve damage, require precise insertion technique and continuous monitoring to reduce these risks.

Patient Monitoring with a Perineural Catheter

Monitoring of Efficacy and Dose Adjustment

Close monitoring of patients with a perineural catheter is essential to ensure the effectiveness of analgesia and to adjust doses appropriately. Regular patient pain monitoring, often using pain scales such as the VAS (Visual Analog Scale) or dedicated questionnaires, is crucial to assess the effectiveness of analgesia. Nurses and anesthesiologists must ensure that the catheter remains correctly positioned and that the local anesthetic is administered adequately.

This includes checking the infusion rate, verifying for leaks or blockages, and adjusting doses based on the patient's response. For patients at home, regular contact with a nurse specializing in pain management is recommended to confirm the treatment is progressing correctly and to make any necessary adjustments. Prevention and Management of Complications: Preventing and managing complications is fundamental in the follow-up of patients with a perineural catheter. Complications may include infections, leaks, catheter displacement, and side effects of the local anesthetic. To avoid infections, strict surgical sterility is essential during catheter insertion, and the insertion site should be monitored daily for signs of infection such as redness, warmth, or the presence of pus. Antibiotic prophylaxis may be advised, especially if the catheter is to remain in place for more than 48 hours. In the event of catheter leakage or displacement, immediate action is required to adjust or replace it if necessary. Patients should be informed of the signs of complications and encouraged to report any abnormalities, such as unusual pain or leakage. It is also important to monitor for systemic side effects of the local anesthetic, such as the risk of cardiac or neurological toxicity. Vigilance to detect the first signs of toxicity and emergency protocols are essential in case of an adverse reaction.

Removal of the perineural catheter

When and how to remove a perineural catheter

Removal of the perineural catheter must be performed carefully to prevent complications. This important moment depends on the duration of analgesia required and the patient's condition. The catheter is usually in place for 48 to 72 hours, depending on medical indications and the patient's specific needs. A specialized nurse performs the removal upon medical prescription. The procedure requires a rigorous method to ensure patient safety in the operating room and minimize risks. The patient must be in a comfortable position, either lying on their side or sitting with back support. It is imperative to wash hands surgically and wear a mask. The dressing is removed and the insertion site is cleaned according to disinfection protocols. The catheter is then gently withdrawn, applying steady traction. If resistance is encountered or if the catheter appears to be stretching abnormally, repositioning the patient may help. If any difficulty is encountered, it is essential to consult the anesthesiologist. After removal, the tip of the catheter should be examined to ensure its integrity and that everything has been removed correctly. The insertion site should then be protected with an appropriate dressing. Post-Removal Instructions: Following catheter removal, it is essential to follow certain instructions for proper healing. The insertion site should be monitored for any signs of infection, such as redness, warmth, or the presence of pus. Good hygiene and adherence to local care instructions are paramount. Strenuous physical activity and driving should be avoided for a period of time specified by the anesthesiologist to reduce the risk of complications. Pain management should continue according to medical instructions, often with the help of oral analgesics and other treatments. In case of severe pain or complications, it is important to contact the healthcare team. Regular medical follow-up is essential to monitor the patient's recovery and address any potential complications. Patients should know the contact details of healthcare professionals to contact in case of a problem.

Practical advice for RNs

Pain management at home

Effective pain management at home for patients with perineural catheters requires a careful approach. Registered Nurses (RNs) must ensure that patients receive appropriate care and that equipment is used correctly. Catheter monitoring is essential to ensure proper placement, adequate anesthetic delivery, and the absence of infection or complications at the insertion site. RNs must be proficient in the use of pumps for continuous infusion of local anesthetics and teach patients and their families how to administer boluses as needed, particularly using patient-controlled analgesia (PCA) pumps. It is also important to ensure a regular delivery of necessary consumables, such as local anesthetics and medical supplies. Communication with the Healthcare Team: Effective communication with all healthcare professionals is essential to ensure optimal patient care. Nurses must adopt structured communication tools to minimize the risk of misunderstandings and maximize patient safety. Oral handovers should be systematically supplemented with written notes, using tools such as the SAED (Data Exchange Assistance System), for clear and precise information transmission. Regular post-procedure debriefings and meetings with the healthcare teams are essential for sharing experiences, discussing potential complications, and improving practices. Patient and Family Education: Patient and family education plays a key role in managing pain at home. It is important that patients and their families are well-informed and able to independently manage the perineural catheter. They should be trained in the use of pumps and infusion devices, bolus administration, and recognizing alarms. Education on local care, monitoring for signs of infection, and actions to take in case of complications, such as catheter leakage or displacement, is also vital. The goal is to empower patients to manage their pain independently, including learning how to move electrodes for neurostimulation devices and managing consumables and care equipment.

Conclusion

Perineural catheters have proven to be an innovative and effective solution for pain management after surgery, especially in orthopedic surgery and peripheral procedures. They provide continuous analgesia, precisely targeting the area of ​​pain while reducing the side effects associated with conventional analgesic medications. Their use increases patient satisfaction, reduces hospital stays, and promotes rapid and efficient rehabilitation.

Nursing staff play a vital role in the monitoring and care of patients with these catheters, ensuring effective pain management at home, facilitating communication with medical teams, and educating the patient and their family. Adhering to clinical guidelines and maintaining rigorous monitoring are essential to prevent and treat potential complications. By incorporating the use of perineural catheters into analgesia protocols, healthcare professionals can offer more comprehensive and compassionate care, thereby contributing to improved patient well-being. It is therefore essential to provide more training and information to healthcare staff on this method to maximize its benefits and ensure superior patient care. FAQ What is a perineural catheter? A perineural catheter is a medical device designed to be placed near a nerve. Its purpose is to continuously deliver a local anesthetic, thus prolonging pain relief after surgery. It is generally inserted in the operating room, with the assistance of neurostimulators and ultrasound, for optimal pain management, particularly after especially painful orthopedic procedures.

How to remove a perineural catheter?

To remove a perineural catheter, proceed as follows:

• Place the patient in the lateral position, with knees drawn up towards their abdomen, or sitting with their back rounded around a cushion.
  
  
• Wash your hands as for a surgical procedure and wear a mask.
  
  
• Remove the dressing and disinfect the area with Biseptine, according to protocol.
  
  
• Hold the catheter near the skin entry point and pull it out gently, applying force regular.
  
  
• If you experience resistance or abnormal stretching of the catheter, stop the procedure, reposition the patient to clear the intervertebral spaces, and try again.
  
  
• If the problem persists, contact an anesthesiologist.

Why insert a peripheral venous catheter?

The insertion of a peripheral venous catheter serves several important purposes:

• To compensate for or prevent deficiencies in water, electrolytes, or nutrients.
  
  
• To administer solutions, medications, blood products, or to perform blood draws.
  
  
• To provide intravenous treatments for short periods, generally less than 7 days.

What is What is a perineural block?

A perineural block is a form of regional anesthesia that targets one or more specific nerves. This method involves injecting a local anesthetic around the targeted nerve, often under ultrasound guidance, to interrupt nerve transmission and provide effective analgesia. This technique can be performed with or without a catheter for continuous anesthetic delivery.