| Intervention: Nerve block |
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| ICD-9 code: | 04.81 | |
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Regional nerve blockade, or more commonly nerve block, is a general term used to refer to the injection of local anesthetic onto or near nerves for temporary control of pain. The International Classification of Health Interventions (ICHI is a system of classifying Procedure codes being developed by the World Health Organization. ICD-9-CM Volume 3 is a system of Procedural codes. It is a subset of ICD-9-CM (volumes 1 and 2 are used for Diagnostic codes. Procedure codes are numbers or alphanumeric codes used to identify specific health interventions taken by medical professionals A local anesthetic is a drug that causes reversible Local anesthesia and a loss of Nociception. A nerve is an enclosed cable-like bundle of peripheral Axons (the long slender projections of Neurons. It can also be used as a diagnostic tool to identify specific nerves as pain generators. Permanent nerve block can be produced by destruction of nerve tissue.
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Therapeutic Uses
Nerve blocks can help patients who suffer from lower back pain, neck pain, sciatica (from a herniated disc), spinal stenosis, reflex sympathetic dystrophy (a complex regional pain syndrome), shingles, cancer, and painful peripheral vascular disease. Back pain (also known " dorsalgia " is Pain felt in the back that usually originates from the Muscles Nerves Bones Sciatica is a set of symptoms including Pain that may be caused by general compression and/or irritation of one of five nerve roots that give rise to the Sciatic nerve Spinal stenosis is a medical condition in which the spinal canal narrows and compresses the spinal cord and nerves Complex Regional Pain Syndrome (CRPS is a chronic progressive disease characterized by severe pain swelling and changes in the skin Herpes zoster (or simply zoster) commonly known as shingles, is a Viral disease characterized by a painful skin rash with Blisters in a limited Cancer (medical term Malignant Neoplasm) is a class of Diseases in which a group of cells display uncontrolled Peripheral vascular disease (PVD also known as peripheral artery disease (PAD or peripheral artery occlusive disease (PAOD is a collator for all Diseases It can also be used in the treatment of migraine headaches. Migraine is a neurological Syndrome characterized by altered bodily experiences painful headaches and nausea Proper patient selection is important.
Methods
Temporary nerve blocks are effected by combining a local anesthetic (such as lidocaine) with epinephrine, a steroid (corticosteroid), and/or opioids. A local anesthetic is a drug that causes reversible Local anesthesia and a loss of Nociception. Lidocaine ( INN) (ˈlaɪdoʊkeɪn or lignocaine (former BAN) (/ˈlɪgnoʊkeɪn/ is a common Local anesthetic and antiarrhythmic drug A steroid is a Terpenoid Lipid characterized by a Carbon skeleton with four fused rings generally arranged in a 6-6-6-5 fashion Corticosteroids are a class of Steroid hormones that are produced in the Adrenal cortex. An opioid is a chemical Substance that has a Morphine -like action in the body Epinephrine produces constriction of the blood vessels which delays the diffusion of the anesthetic. Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels particularly the large Arteries, Arterioles Steroids can help to reduce inflammation. Opioids are painkillers. Injection nerve blocks can be either single treatments, multiple injections over a period of time, or continuous infusions.
Permanent nerve block can be effected using include alcohol or phenol to selectively destroy nerve tissue, cryoanalgesia to freeze nerves, and Radiofrequency ablation to destroy nerve tissue using heat. Phenol, is a toxic colourless Crystalline Solid with a sweet tarry odor commonly referred to as a "hospital smell" Radio Frequency Ablation ( RFA) of Lung kidney breast bone and Liver tumors RFA is performed to cure tumors in lung liver kidney bone and rarely in other
Nerve blocks are sterile procedures that are usually performed in an outpatient facility or hospital. A patient is any person who receives medical attention care or treatment. The procedure can be performed with the help of ultrasound, fluoroscopy (a live X-ray) or CT. Not to be confused with Supersonic. Ultrasound is cyclic Sound pressure with a Frequency greater than the upper Fluoroscopy is an imaging technique commonly used by Physicians to obtain real-time moving images of the internal structures of a patient through the use of a fluoroscope Use of any one of these imaging modalities enables the physician to view the placement of the needle. A probe positioning system can be used to hold the ultrasound transducer steady. A probe positioning system is a tool for the positioning of a (hand-held measuring device such as an Ultrasound transducer in a fixed predetermined place to the object such as a patient Ultrasonic sensors (also known as transducers when they both send and receive work on a principle similar to radar or sonar which evaluate attributes of a target by interpreting
In addition, electrical stimulation can provide feedback on the proximity of the needle to the target nerve.
Complications
Nerve blocks, like other medical procedures, are not risk-free. There is a possibility of side effects and complications from the procedure, needle puncture, and medications used. The most critical factor in the efficacy of a nerve block is the proper location of the target nerve.
Complications include:
- Infection
- Allergy reactions
- Increased pain
Nerve blocks in Veterinary medicine
Short-term nerve blocks are useful in regionalizing the source of pain during lameness examinations in horses. LAME is an Open source application used to encode audio into the MP3 file format A local anesthetic alone is injected perineurally to desensitize tissues beyond the site of injection. For example, the palmar digital nerves can be blocked to investigate pain arising from the sole and heel area of the hoof. HoofRearHoovesjpg|thumb|200px|right|Rear hooves of a horse]] A hoof is the tip of a Toe of an Ungulate Mammal, strengthened by a thick horny ( If pain is arising from this area, the horse will stop limping. If the source of lameness arises from higher up in the leg, the horse will continue to limp, and a nerve block can be performed higher up the leg. Because there are essentially no motor neurons in the lower limbs of horses, the risk of weakness or ataxia is negligible. In Vertebrates the term motor neuron (or motoneuron) classically applies to Neurons located in the Central nervous system (or CNS that project Ataxia (from Greek α- as a negative prefix + -τάξις, meaning "lack of order" is a neurological sign and symptom consisting [1]
References
- ^ Bassage II, Lance; Ross MW (2003). "Diagnostic Analgesia", in Ross MW, Dyson SJ: Diagnosis and Management of Lameness in the Horse. St. Louis, MO: Saunders, pp. Saunders is a Surname of English and Scottish Patronymic origin derived from Sander a mediæval form of Alexander. 93-124. ISBN 0-7216-8342-8.
External links
- Study finds nerve blocks provide little benefit beyond 3 months
- Video demonstrating a Continuous Nerve Block Technique in Orthopaedics
- Video demonstrating ultrasound-guided interscalene nerve block using a probe positioning system
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