News Updates
What is a nerve block?
Release date:
2021-11-01 09:36
Source:
The Voice of Miller
The original purpose of anesthesia was simply to facilitate surgery and better ensure patient safety during the procedure. As public awareness of pain has grown, postoperative pain has come to be increasingly recognized as a critical concern. Postoperative pain not only impairs cardiopulmonary function, prolongs hospital stays, and increases the risk of complications, but it also significantly affects patients’ emotional well-being. This has placed higher demands on anesthesiologists, and postoperative analgesia has gradually become a routine component of their practice. Anesthesiologists have continuously explored various analgesic strategies: simple oral medications after surgery often prove inadequate, patient-controlled analgesia pumps carry certain side effects, and regional nerve blocks alone may fail to meet analgesic needs. Consequently, multimodal analgesia has been introduced, and its adoption is steadily gaining traction. Nerve blockade, as one element of this approach, offers distinct advantages. With advances in local anesthetics, nerve blocks can provide prolonged analgesia while exerting minimal impact on physiological functions, aligning closely with the Enhanced Recovery After Surgery (ERAS) principles advocated by surgeons.
The goal of ERAS is to shorten patients’ hospital stays, promote early recovery, and reduce the incidence of postoperative complications, with surgical patients deriving particular benefits.
So, what kind of anesthesia is nerve block anesthesia?
Nerve blockades involve injecting a local anesthetic into the nerve trunk, nerve plexus, or paraneural ganglia of the trunk or extremities, thereby temporarily interrupting the nerve’s conduction and producing anesthesia in the area it innervates. With the widespread use of ultrasound and nerve stimulators, peripheral nerve blocks have assumed a pivotal role in perioperative anesthesia and analgesia. Nerve blocks not only provide effective intraoperative and postoperative pain relief, facilitating early patient rehabilitation, but when combined with general anesthesia, they also reduce the required dose of general anesthetics, significantly lowering the incidence of adverse effects such as postoperative nausea and vomiting and cognitive dysfunction in elderly patients.
Some patients have systemic organ abnormalities. Conventional general anesthesia, with its sedative, analgesic, and muscle‑relaxant effects, can significantly impair respiratory function, while neuraxial anesthesia, due to its pronounced impact on the circulatory system, is also contraindicated. Moreover, many procedures demand complete analgesia, a goal that simple nerve blocks often fail to achieve. Therefore, combining nerve blockades with either general anesthesia or neuraxial anesthesia—when appropriately tailored with pharmacologic agents—can leverage the strengths of each approach while mitigating their respective limitations, leading to rapid postoperative emergence and swift recovery.
Nerve block anesthesia offers numerous advantages; however, because it requires a certain level of technical skill, not every anesthesiologist can perform it proficiently. Moreover, it is contraindicated in patients with coagulation disorders, infections at the puncture site, neurological conditions, excessive anxiety, or psychiatric illnesses.
Nerve block anesthesia is one such anesthetic technique; however, as an invasive procedure, it also carries certain risks, including local anesthetic toxicity, vascular injury, block failure, infection, and nerve damage.
In fact, nerve blocks are not a new form of anesthesia; rather, with the advent of ultrasound and nerve stimulators, these tools have become our “eyes,” helping to reduce risks, improve success rates, and broaden the scope of their clinical application.
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