Vascular occlusion in the glabella: signs and first steps

The glabella, the area between the eyebrows, is one of the areas of the face where filler demands the most respect. It is supplied by small, superficial arteries that come from the circulation of the eye, with few alternative blood routes. An occlusion there can lead to skin necrosis and, more rarely, to vision loss.

That is why it is important to separate the two procedures that share the name of the area. Botulinum toxin in the glabella is the most common procedure and does not cause vascular occlusion. Filler for deep static glabellar lines is a different procedure, high risk, which many professionals restrict or avoid.

This guide is a review: anatomy, signs, how the first response is organized, and prevention. It gives no doses, dilutions or injection protocols, which follow updated guidelines and the decision of the qualified professional, according to the rules of their professional council. The general concept is in the entry on vascular occlusion.

Why is the glabella a high-risk area?

Three characteristics weigh in practice:

• Direct link to the eye. Product that enters a glabellar artery and is pushed against the flow can reach the ophthalmic artery and, from there, the central retinal artery.
• Limited collateral circulation. Glabellar skin has few alternative supply routes, which favors necrosis when a branch is blocked.
• Superficial, variable vessels. The position and depth of the arteries change between people and between sides, over the procerus and corrugator muscles.

The full map of risk areas is in vascular danger zones of the face.

What are the signs of occlusion in the glabella?

Pain can be masked by the anesthetic in the product. Watch color and capillary refill throughout the injection, comparing with the neighboring skin.

How do you tell it apart from other conditions?

Ptosis after botulinum toxin usually appears days after the injection and is unrelated to occlusion. A drooping eyelid that is immediate, during a filler, with pain or visual change, however, is an alarm sign.

What to do when you suspect it: first steps

At review level, complication protocols usually organize the first response like this:

1. Stop the injection immediately.
2. Ask about and test vision in each eye separately, and repeat at short intervals. Any change shifts the priority to immediate referral.
3. Assess the area: color, capillary refill, temperature and extent.
4. Activate the practice's written protocol, with the complication kit at hand.
5. With hyaluronic acid, use hyaluronidase across the whole ischemic area, following updated guidelines and the professional's judgment, reassessing perfusion.
6. Adjuvant measures cited in protocols have variable evidence and neither replace the enzyme nor delay referral.
7. Systemic medication, when indicated, is a medical decision.
8. Record everything: time, signs, serial photos, actions and times.
9. Do not discharge the patient without signs of reperfusion, without preserved vision and without a plan for follow-up and contact.

What comes after the acute phase?

Even when perfusion returns, the glabella needs close follow-up in the following days. Areas that suffered ischemia can form crusts, peel and change color for weeks. When there is necrosis, wound care comes in, with medical assessment, along with long-term planning for the scar, which sits in a very visible area of the face.

A few practical points for this phase:

• Frequent follow-ups, with photos in the same standard to compare progress.
• Reassessment of vision at follow-up, even if it was normal at the first visit.
• Easy contact with the professional, so the patient can report any change.
• Clear, honest communication from the first sign, without downplaying.
• Review of the case afterward: indication, product, volume and what may change in future visits.

Adverse events with health products can be reported to ANVISA (Brazil's health regulatory agency); see adverse event reporting through Notivisa.

How do you reduce the risk in the glabella?

• Consider toxin before filler. Glabellar lines are largely caused by muscle movement; toxin treats that cause with no risk of occlusion. See dynamic wrinkles and static wrinkles.
• Question the indication for filler. If it is done, minimal volumes and a low-viscosity, reversible product are the most cited choice, at the professional's discretion.
• Know the anatomy and its variation, without relying on a fixed safe zone.
• Have hyaluronidase and the protocol ready before starting, with a defined ophthalmology referral flow.
• Watch the skin and ask about vision throughout the injection.
• Inform the patient about the risk and the warning signs.

How do you talk about this risk with the patient?

The informed consent should mention vascular occlusion, necrosis and visual complication when filler is used in the area. The consent template for botulinum toxin covers the most common glabellar procedure; for filler, adapt a specific consent with legal review and review of your professional council's rules.

And in Harmy?

The full anatomy is on the page for the area, glabella.

Readiness checklist for glabellar procedures

1. Indication reviewed: toxin considered before filler.
2. Hyaluronidase in the practice, within its expiry date, with a written protocol.
3. Urgent ophthalmology referral flow defined.
4. Vision test included in the complication protocol.
5. History of procedures in the area recorded.
6. Standardized photos before the procedure.
7. Informed consent mentioning necrosis and visual complication.
8. Patient informed about warning signs and given a contact channel.