Complications of Inferior Alveolar Nerve Block – Transient Hemi facial paralysis treatment

The inferior alveolar nerve block is a Mandibular nerve block given to anesthetize the Mandibular teeth, due to its proximity to other Nerves and muscles and salivary glands it has many complications if the technique in which it is given is wrong. Here we have mentioned the most common to some of the rarest complications which have arisen due to an improper technique of Inferior Alveolar Nerve block. 

Complication Specific to Inferior Alveolar Nerve Block: 

Undesirable Never Block: Due to the proximity of the Inferior alveolar nerve block needle position to the facial nerve and the Parotid through which it passes is the result of this complication where we can see the characteristic complications when the Facial nerve is anesthetized:

Transient Hemifacial Paralysis: In this, we can see from the image below that the muscles being supplied by that side of the facial nerve is affected and cannot contract, and this results in loss of muscle action of the affected side of the face.

  • Where the eyelids cannot be closed by the patient
  • Loss of maintaining of lips position on the affected side and drooping of the lips on the affected side is seen in the image below.

Inferior alveolar nerve complications

How to manage Transient Hemifacial Paralysis due to the complication of Inferior alveolar nerve block

  1. If this condition is ever encountered be calm and explain the patient about the problem which has occurred and assure him/her that it is temporary and will be back to normal in 3 hours after the effect of local anesthesia is gone.
  2. Prescribe any Lubricating Eye drops and ask the attendant or the patient to keep putting 2 drops for every 15 mins on the affected eye to keep the eyes wet as the eyelids cannot be closed due to paralysis of the facial nerve.
  3. Ask the patient to use a clean cloth to keep over the eye to prevent dust from entering the open eye.
  4. Lastly, ask the patient to stay in the clinic for 3 hours if possible to monitor the condition after the effect of local anesthesia wears off.

The General Complications of Inferior Alveolar Nerve Block which is common with other nerve blocks:

  1. Muscle Trismus: It is due to muscle spasm which is caused when the injection is given into the Medial Pterygoid muscle causing tearing of the muscle fibers. It is called as Medial Pterygoid Trismus or Myospasm. The onset of Muscle trismus in inferior alveolar nerve block is after 24 hours of the injection and it resolves by itself without any treatment. In some cases, anti-inflammatory drugs and muscle relaxants might be required. 
  2. Hematoma: It is also caused when there is an accidental injection to the Blood vessel which in turn leads to Hematoma formation.
  3. Mucosal Irritation: The Irritation of the Mucosal tissue can be either due to allergic reaction to the needle itself or the anesthetic agent. 
  4. Infection: 
  5. Needle Breakage: If care is not taken in maintaining the proper position of the needle or excess force is applied, there have been instances of needle breakage during IAN block. 
  6. Numbness of Auricle or Ear Lobe: This is a very rare complication which has been reported where the patient has experienced numbness of the auricle on the side of Inferior Alveolar injection which lasted for an hour. This is seen due to the accidental anesthetic injection to the auriculotemporal nerve resulting in numbness. 

Click here for: List of Complications due to Nerve Block

  1. January 14, 2013
  2. October 31, 2013
  3. November 17, 2013
  4. July 15, 2017
  5. July 17, 2017
  6. September 7, 2017
  7. September 8, 2017
  8. October 26, 2017
  9. November 4, 2017
  10. November 5, 2017
  11. November 11, 2017
  12. November 13, 2017
  13. November 27, 2017
  14. January 5, 2018
  15. January 6, 2018
  16. January 10, 2018
  17. January 22, 2018
  18. January 31, 2018
  19. March 1, 2018
  20. March 27, 2018
  21. March 27, 2018
  22. March 30, 2018
  23. March 31, 2018
  24. March 31, 2018
  25. April 13, 2018
  26. April 18, 2018
  27. May 9, 2018
  28. May 11, 2018
  29. May 11, 2018
  30. May 29, 2018
  31. June 1, 2018
  32. July 30, 2018
  33. July 30, 2018
  34. September 26, 2018
  35. September 26, 2018
  36. February 17, 2019
  37. February 18, 2019
  38. February 21, 2019
  39. February 28, 2019
  40. April 4, 2019
  41. April 4, 2019
  42. June 19, 2019
  43. August 17, 2019
  44. August 17, 2019

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