How do I apply a compression bandage to the scalp and which imaging studies should be ordered?

Compression Bandage Application to Scalp

For scalp wounds requiring compression, apply the bandage in a circular fashion around the head with firm, even pressure over the wound site, ensuring adequate compression without compromising circulation, and secure with tape or clips.

Compression Bandage Technique

The fundamental principle of compression dressing is achieving adequate mechanical pressure to arrest bleeding and reduce fluid accumulation 1. For scalp wounds specifically:

Application Steps:

• Start with direct pressure over the wound using gauze or absorbent material
• Wrap circumferentially around the head, incorporating the forehead and occiput for anchor points
• Apply firm, even tension with each pass - the bandage should be snug but not cause blanching of surrounding skin or patient discomfort
• Overlap each layer by 50% to ensure uniform compression across the wound
• Secure the end with tape or clips

Key Technical Points:

The compression must create sufficient pressure to collapse small vessels and reduce dead space where hematomas form 1. Poor technique often results in no actual compression being achieved, leading to continued oozing, hematoma formation, and increased infection risk 1.

Alternative for uncooperative patients: Silastic foam can be used to secure dressings while leaving the rest of the scalp uncovered, which is particularly effective when traditional wrapping is difficult 2.

Common Pitfalls:

• Wrapping too loosely (no compression achieved)
• Wrapping too tightly (compromising circulation or causing pain)
• Inadequate anchoring (bandage slips off)
• Insufficient coverage of the wound edges

---

Imaging for Head Trauma

Order a noncontrast head CT as the initial imaging study for any acute head trauma requiring evaluation.

Imaging Algorithm Based on Clinical Severity:

Mild head trauma (GCS 13-15):

• If clinical decision rule indicates imaging (e.g., 2008 ACEP criteria): Noncontrast head CT is usually appropriate 3
• If clinical decision rule does NOT indicate imaging: CT is usually NOT appropriate 3

Moderate (GCS 9-12) or severe (GCS 3-8) head trauma:

• Noncontrast head CT is usually appropriate as initial imaging 3

Penetrating trauma:

• Noncontrast head CT is usually appropriate 3

Follow-up Imaging:

Short-term follow-up with unchanged neurologic exam:

• Noncontrast head CT is usually appropriate, though some patients with normal exam and small hemorrhage (<10 mL) may not require routine repeat imaging 3

New or progressive neurologic deficits:

• Noncontrast head CT is usually appropriate 3

Subacute/chronic trauma with unexplained deficits:

• Either noncontrast brain MRI or noncontrast head CT is appropriate (equivalent alternatives) 3

Special Circumstances:

Suspected intracranial arterial injury (based on clinical risk factors or prior imaging):

• Head and neck CTA is usually appropriate 3

Suspected intracranial venous injury:

• Head CTV is usually appropriate 3

Suspected CSF leak:

• Noncontrast head CT, maxillofacial CT, and/or temporal bone CT are appropriate depending on leak location 3

Why CT First?

CT is rapid, readily available in trauma settings, compatible with monitoring equipment, and excellent for detecting skull fractures, extra-axial hematomas (epidural, subdural), subarachnoid hemorrhage, and parenchymal injury 4, 5. MRI is more sensitive for parenchymal injury and diffuse axonal injury but requires longer scanning time and has compatibility issues with monitoring equipment 4, 5.