Lidocaine Dosing and Toxicity Management

Maximum Dose Calculations

The American Academy of Pediatrics recommends administering no more than 4.5 mg/kg of lidocaine without epinephrine (maximum 300 mg) or 7 mg/kg with epinephrine for local infiltrative anesthesia in adults, calculating the maximum allowable dose in milligrams before starting any procedure 1, 2
For pediatric dosing, the maximum dose is 4.4 mg/kg without epinephrine and 7 mg/kg with epinephrine for medical procedures, or 4.4 mg/kg with epinephrine for dental procedures 1
Infants under 6 months require a 30% reduction in all amide local anesthetic doses 1, 3

To calculate the maximum volume of lidocaine solution, determine the maximum dose in mg by multiplying patient weight (kg) by the maximum mg/kg dose, then convert concentration to mg/mL, and finally calculate the maximum volume by dividing the maximum dose (mg) by the concentration (mg/mL) 2

The American Academy of Pediatrics recommends reducing doses in highly vascular areas due to increased systemic absorption 1, 3, 2
Doses should also be reduced in elderly patients due to altered pharmacokinetics 2

Early central nervous system signs include circumoral numbness and facial tingling, metallic taste, tinnitus and auditory disturbances, and lightheadedness and dizziness 1, 2, 3
Progressive CNS toxicity can lead to CNS excitation, seizures, and CNS depression 1, 2, 3
Cardiovascular toxicity can manifest as cardiac depression, arrhythmias, and cardiac arrest and asystole 1, 3

The American Heart Association recommends stopping local anesthetic administration immediately and calling for help in cases of LAST, ensuring immediate availability of oxygen, resuscitative drugs, and cardiopulmonary equipment 1, 3
Airway management involves administering 100% oxygen and securing the airway if needed, while seizure management involves administering benzodiazepines or propofol 1, 3
Cardiovascular support involves following standard ACLS protocols and reducing individual epinephrine doses to <1 μg/kg 1, 3
Lipid emulsion therapy is indicated for severe cardiovascular toxicity or refractory seizures 1, 3

The American Academy of Pediatrics recommends calculating the maximum allowable dose in mg before starting the procedure, using ideal body weight for calculations, and considering cumulative dosing in prolonged or multistage procedures 1, 2, 3
Aspirating before each injection and repositioning the needle until no blood return on aspiration can help avoid intravascular administration 1, 2, 3
Monitoring requirements include documenting vital signs every 5 minutes initially, then every 10-15 minutes once stable, and continuously assessing and communicating with the patient 1, 2, 3