Sympathetic nerve blocks

Overview

Understanding sympathetic nerve blocks

The sympathetic nervous system helps regulate functions such as blood-vessel tone, sweating, and temperature. In some conditions, these signals may interact with persistent pain.

The target depends on the body region and diagnosis. A block may provide diagnostic information or temporary symptom change, but response alone does not define the entire condition.

Useful context

When this may be discussed

• Selected complex regional or sympathetically maintained pain patterns
• Testing whether sympathetic signaling contributes to symptoms
• Supporting movement or rehabilitation when a temporary response occurs

At the clinic

What the process may involve

1. 01

   Review of the diagnosis, target, medications, bleeding and infection risk, and alternatives

2. 02

   Monitoring, positioning, skin preparation, and local anesthetic

3. 03

   Image-guided needle placement near the selected sympathetic structure

4. 04

   Observation for expected temperature, sensation, blood-pressure, or other temporary changes

Benefits, limits, and risks

Questions to discuss before treatment

• The expected effects and risks differ by the specific block and body region.
• Possible complications include bleeding, infection, medication reaction, low blood pressure, temporary weakness or numbness, injury to nerves or nearby organs, and lack of benefit.
• Some patients need additional precautions because of anticoagulants, heart or lung disease, diabetes, infection, or pregnancy.