Spine Trauma

Discussion includes the structure and function of the spinal cord and its injuries.

Composed of stacked vertebrae and intervertebral discs.
- Spinal column holds the spinal cord, which runs through the center.
- Spinal nerves branch off from the spinal cord.
Key areas with a concentration of nerves:
- Lumbar Plexus: Nerves extending from the lower part of the spine.
- Brachial Plexus: Nerves extending from the neck to the upper body.
Dermatome map: Used to identify sensation loss and potential injury locations based on nerve distribution.

Each vertebra consists of:
- A rounded body with a central hole for the spinal cord.
- Spinous Process: The projection felt along the back.
- Transverse Process: Lateral projections from each vertebra.
Risks involved:
- A fracture can lead to sharp bone fragments damaging the spinal cord.
Injuries are more prevalent in the cervical (neck) and lumbar (lower back) regions due to lack of bony protection.

Common causes of spinal injuries include trauma, overuse injuries, and falls.
In severe trauma, fractures of the spinous or transverse processes can occur, posing risks to the spinal cord.

Two primary types:
- Complete Transection: Complete loss of function below the injury.
- Incomplete Transection: Partial preservation of function, which varies by the injury's location and severity.

Ascending Tracts: Carry sensory information to the brain.
Descending Tracts: Convey motor commands from the brain to the body.
Neuroscientific implication: Determining the injury's nature helps diagnose and treat patients effectively.

Significant spinal cord levels and their associated sensations:
- C4: Clavicle area.
- T4: Nipple level.
- T10: Umbilicus level.
Understanding these landmarks assists in determining the level of spinal cord injury.

Cervical injuries:
- C3, C4, C5, and C6 are frequently injured due to their exposure.
- C1 (Atlas) and C2 (Axis) injuries are often fatal.
Importance of the phrenic nerve at C3, C4, and C5 which is vital for diaphragm function.

Spinal Shock:
- Resulting from loss of communication due to spinal cord injury, leading to loss of homeostasis and blood circulation regulation.
- Symptoms can include lowered blood pressure and altered heart rates.
Neurogenic Shock: Specific type of shock due to spinal cord injury characterized by:
- Normal to low heart rate.
- Warm, pink skin in the area due to increased blood flow but can result in mottled skin in severe cases.
Addressing primary vs. secondary injuries:
- Primary Injury: Immediate damage from the trauma.
- Secondary Injury: Complications arising from swelling, bleeding, and lack of oxygenated blood flow to the spinal cord.

Anterior Cord Syndrome:
- Caused by anterior compression of the spinal cord, leading to loss of motor function and pain, while light touch sense may be preserved.
Central Cord Syndrome:
- Resulting from hyperextension injuries, leading to weakness in upper limbs more than lower ones.
Brown-Sequard Syndrome:
- Hemi-transection resulting in loss of motor function and vibration sense on one side of the body and loss of pain and temperature on the other side.

Spinal Cord Perfusion Pressure (SCPP):
- Defined as $SCPP = MAP - Extrinsic Pressure$ , which highlights the importance of maintaining adequate blood pressure for spinal cord health.
- Monitoring MAP becomes critical in individuals with compromised spinal cord injuries.
Treatment must focus on stabilizing blood pressure and managing fluid volumes.
Spinal motion restriction protocols differ from standard trauma protocols:
- Recognize potential distracting injuries that may distract from underlying spinal injury assessment.

The takeaways highlight the need for a cautious approach to suspected spinal injuries to minimize risk and manage complications effectively.
Students should be prepared to recognize and address these injury types in practice, keeping updated with PHTLS guidelines.