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Sphenopalatine Ganglion Block

A few small structures (ganglia and associated nerves) located near the middle of the head are primarily responsible for dilation or constriction of blood vessels. Irritation within these structures is one of the primary causes of recurrent headaches (migraine, cluster, etc.). A sphenopalatine ganglion (SPG) block involves the safe delivery of anesthetic to the back of the nasal cavity via the nostril. Delivery of anesthetic to this location helps evaluate the source of head or facial pain, and often eliminates or significantly decreases pain.

An SPG block is a low-risk, minimally invasive procedure that can be effective when other treatments have failed. It can be repeated in 1-2-week intervals, if necessary. Please note that an SPG block cannot be performed if you have an allergy to local anesthetic or an active respiratory infection (nasal congestion).

HOW DO I PREPARE FOR MY PROCEDURE?

  • Take all prescribed medications (including anticoagulation medication) as directed before, during, and after the procedure.
  • Wear comfortable clothing.
  • Please arrive 15 minutes prior to your appointment.
  • Please make sure you are well hydrated prior to the procedure and bring a water bottle with you to your appointment.
  • You may experience discomfort or dizziness, so please have someone accompany you on the day of your test. If this is your first SPG, you are required to have someone else drive you home.
  • You will need to purchase Drixoral (decongestant spray) and bring it with you to your procedure. We will explain how to use it when you arrive for your appointment. Our booking coordinators will discuss this with you.

WHAT HAPPENS DURING MY PROCEDURE?

  • A team member will explain the consent form, procedure details, and answer any questions.
  • We will then escort you to our treatment suite where you will meet the radiologist or anesthesiologist who will perform your exam.
  • After the location is confirmed with X-ray guidance, the long-lasting freezing will be injected using a thin, flexible catheter.
  • You will be assessed post-injection by our team and, if there are no concerns, you will be free to leave.

POST-PROCEDURE INSTRUCTIONS

  • First 24 hours: 
    • No exercise or strenuous activity, including sexual activity for 24 hours post procedure.
    • Drink large amounts of fluids.
    • Keep a headache or pain diary after your procedure.
    • After your injection, you may have a bitter taste in you mouth due to the local anesthetic. You may also experience temporary dizziness or light-headedness; low blood pressure; numbness of the nose, throat and lips; a mildly bloody nose, tearing or facial flushing; and, rarely, a temporary increase in pain, nasal congestion, or nasal infection.
  • Follow-up with your referring doctor as needed.

WHEN WILL I SEE RESULTS?

  • Results can vary. Some patients experience some pain relief immediately.
  • An SPG block can provide relief from days to months. If this procedure does not help relieve your symptoms, then you may need further evaluation by your referring doctor.

HOW MUCH WILL IT COST?

This exam is covered under your Alberta Health Care Plan. It is not currently offered at our Saskatchewan clinic.

FOR YOUR APPOINTMENT

Please ensure that you bring your requisition with to your appointment.


DURATION

20-30 minutes

LOCATION

FREQUENTLY ASKED QUESTIONS

How long does the injection take to work?

Results can vary. Some patients experience some pain relief immediately.

How long will the injection last?

An SPG block can provide relief from days to months. If this procedure does not help relieve your symptoms, then you may need further evaluation by your referring doctor.

How many injections can I have and how often?

There is no limitation as to how often you can have this procedure done.

What are the side effects?

After your injection, you may have a bitter taste in you mouth due to the local anesthetic. You may also experience temporary dizziness or light-headedness; low blood pressure; numbness of the nose, throat and lips; a mildly bloody nose, tearing or facial flushing; and, rarely, a temporary increase in pain, nasal congestion, or nasal infection.