The Temporal Artery: Clinical Uses from Blood Pressure Monitoring to Biopsy

The superficial temporal artery—a major branch of the external carotid artery that runs across the temple—is uniquely accessible for several important clinical applications. Its superficial course makes it a valuable window into vascular health.

1. Non-Invasive Blood Pressure Measurement

Temporal artery tonometry devices measure blood pressure by sensing the artery's pulse wave. This approach is particularly valuable for:

• Infants and children (far less distressing than cuff measurements)
• Patients with difficult upper-arm access (obesity, dialysis access, trauma)
• Continuous intraoperative or ICU monitoring scenarios

2. Temporal Artery Biopsy (TAB) – Gold Standard for Giant Cell Arteritis

TAB is the definitive diagnostic test for Giant Cell Arteritis (GCA), a vasculitis of medium and large arteries affecting adults over 50.

• Procedure: A 1–2 cm segment is excised under local anesthesia
• Histology: Shows granulomatous inflammation, multinucleated giant cells, and fragmentation of the internal elastic lamina
• Timing: Best performed within 1–2 weeks of starting corticosteroids (though histologic changes persist longer)
• Bilateral biopsy increases sensitivity (single-side sensitivity ~85–90%)

3. Arterial Blood Sampling

The temporal artery serves as an alternative to the radial artery for arterial blood gas (ABG) analysis—measuring pH, PaO₂, PaCO₂, bicarbonate, and oxygen saturation—when radial access is compromised or contraindicated.

4. Transarterial Embolization Access

Interventional radiologists can catheterize the temporal artery to reach target vessels for embolization procedures treating:

• Refractory epistaxis (severe nosebleeds)
• Vascular malformations of the head and neck
• Scalp and facial tumors
• Traumatic vascular injuries

Microcatheters navigate from the temporal artery to deliver coils, particles, or liquid embolic agents.

Precautions and Anatomic Considerations

• Superficial location demands meticulous technique to avoid vessel laceration or thrombosis
• Anatomic variability: Course, depth, and branching patterns vary significantly between individuals
• Facial nerve proximity: The frontal branch of the facial nerve runs nearby; deep dissection risks temporary or permanent injury
• Experienced operators essential for all invasive temporal artery procedures