Local Anesthetic Guidelines

Administration and Dosage

The American Society of Anesthesiologists recommends using low concentrations of local anesthetic, such as bupivacaine or ropivacaine 0.1-0.25% for single shot, in patients receiving digital nerve blocks 1
The American Academy of Dermatology recommends 1% lidocaine without epinephrine as the first choice for digital nerve blocks, with an onset of 1-3 minutes and duration of 1.5-2.5 hours, and a maximum dose of 4-5 mg/kg (not to exceed 300 mg total) 2, 3
For longer procedures (>1.5 hours), 0.75% ropivacaine may be considered, with an onset of 3.5-5.5 minutes and duration of 19-23 hours of postoperative analgesia 3
Adding sodium bicarbonate to local anesthetics can reduce pain of infiltration, as recommended by the American Academy of Dermatology 2

The equipment needed for a digital nerve block includes 1% lidocaine without epinephrine (3-5 mL), a 25-27 gauge needle, and sterile preparation supplies 2
The technique involves positioning the patient's hand with palm facing down, identifying the web space at the base of the index finger, and inserting a 25-27G needle at the dorsal web space between the index and middle fingers, advancing to the volar aspect without penetrating too deeply, aspirating to ensure no intravascular placement, and injecting 1-2 mL of anesthetic 2

The American Society of Regional Anesthesia and Pain Medicine suggests that patients who receive digital nerve blocks may be safely discharged home with residual sensory blockade, provided they receive written instructions about the expected duration of the block and proper care until normal sensation returns 4
Monitoring distal circulation after the block is crucial, especially with circumferential injuries, and not exceeding maximum recommended doses of local anesthetics is essential 2, 3
The American Academy of Dermatology recommends avoiding epinephrine-containing solutions in digits due to the risk of ischemia and necrosis, and using sterile technique to avoid introducing infection 2, 3

The benefits of a digital nerve block include complete anesthesia of the entire digit, avoidance of tissue distortion, reduced total anesthetic volume needed, prolonged anesthesia duration, and decreased postoperative discomfort 2, 3
Potential complications include hematoma formation at the injection site, nerve damage (rare), local anesthetic systemic toxicity (rare with proper dosing), and inadequate anesthesia requiring supplemental block 2, 3

The index finger is innervated by four digital nerves: two dorsal digital nerves (radial and ulnar aspects) and two volar digital nerves (radial and ulnar aspects), and the traditional dorsal digital block provides better coverage of the proximal dorsal surface 2
A digital nerve block is the preferred method for index finger procedures requiring anesthesia due to its ability to provide complete anesthesia with minimal tissue distortion, prolonged analgesia, and decreased postoperative discomfort compared to local infiltration 2