What to Expect from Lung AVM Embolization & Recovery?

A lung arteriovenous malformation (AVM) is an abnormal, direct connection between an artery and a vein in your lung that bypasses the normal capillary system. During a lung AVM embolization, an interventional radiologist threads a thin tube (catheter) through a blood vessel in your groin (or sometimes your neck) and up into the lungs. They then place tiny coils or specialized vascular plugs directly into the abnormal blood vessel to block the blood flow ^[1]. The procedure is minimally invasive, highly effective, and is the standard of care to prevent dangerous complications of Hereditary Hemorrhagic Telangiectasia (HHT), such as stroke or bleeding ^[2][3][4].

Before the Procedure

Before your embolization, your medical team will typically map out your lungs using a CT scan ^[5][6]. This allows the interventional radiologist to understand the exact size and location of your AVM.

Because you will be sedated, you will be given specific pre-procedure instructions, such as fasting (not eating or drinking for several hours beforehand) and guidelines on which of your normal medications to take or pause.

On the day of the procedure, you will be given medication to keep you comfortable. Depending on your doctor’s preference, your hospital’s protocol, and the complexity of your specific AVMs, you may receive either conscious sedation (often called “twilight sleep,” where you are relaxed and sleepy but awake) or general anesthesia (where you are completely asleep) ^[7].

Step-by-Step: During the Procedure

The embolization itself typically takes between one and three hours. Here is what happens in the procedure room:

• Vascular Access: The doctor will numb an area of your skin, most commonly over your groin to access the femoral vein, though sometimes a vein in the neck is used ^[1].
• Navigation: A thin, flexible catheter is gently guided through your blood vessels, through the right side of your heart, and into the pulmonary arteries in your lungs. You will not feel this movement inside your body.
• Deploying the Devices: Once the catheter reaches the feeding artery of the AVM, the doctor deploys specialized medical devices to permanently plug the vessel. These devices can be coils (tiny wire spirals) or vascular plugs (small mesh cylinders) ^[8][9]. Both are highly effective, but vascular plugs are increasingly preferred by many specialists because they have a lower rate of the vessel re-opening (recanalization) over time ^[4][10].
• Closing: After confirming the blood flow to the AVM is blocked, the catheter is removed. Pressure is applied to the access site to prevent bleeding, and a small bandage is placed over the skin.

The Recovery Period

In the Hospital

Most patients are closely monitored for four to six hours after the procedure to ensure the access site is stable. In many cases, you will be able to go home the same day, although some hospitals or specific patient situations may require an overnight stay for observation ^[2][11].

At Home

Recovery is generally quick, and most people can return to their normal daily activities within a few days. You will likely be instructed to avoid heavy lifting or strenuous exercise for about a week to allow the access site to heal properly.

It is common to experience mild side effects as your body adjusts:

• Soreness: You may have slight bruising or tenderness at the access site in your groin or neck.
• Post-Embolization Syndrome: Many patients experience a temporary reaction as the lung tissue responds to the AVM being blocked off ^[12]. The most common symptom is pleuritic chest pain—a sharp, catching pain in your chest when you take a deep breath. You may also experience a low-grade fever or a mild cough. This syndrome is normal, usually peaks within the first 48 hours, and can generally be managed with rest and over-the-counter pain relievers.

Risks and When to Call the Doctor

While lung AVM embolization is very safe, all medical procedures carry some risks, including allergic reactions to contrast dye, bleeding at the access site, or, rarely, the device shifting ^[2]. It is important to know the difference between normal recovery and an emergency.

Call your doctor or seek emergency care immediately if you experience:

• Severe or worsening shortness of breath
• Chest pain that feels like pressure, crushing, or radiates to your arm or jaw (which is different from the sharp, catching pain of pleurisy)
• A high fever (typically over 101°F or 38.3°C) that does not come down
• Heavy bleeding, rapid swelling, or expanding redness at your groin or neck access site
• Any signs of a stroke, such as sudden numbness, confusion, or difficulty speaking

Long-Term Expectations for HHT Patients

Embolization successfully treats the targeted AVMs and significantly lowers your risk of serious complications. However, because the underlying cause is HHT, your body may form new AVMs in the future, or previously treated AVMs can sometimes find a way to re-open (recanalize) ^[13][14].

Because of this, you will need lifelong surveillance ^[15]. Your care team will recommend regular follow-up imaging—such as a contrast echocardiogram (a bubble study, where sterile saltwater with tiny microbubbles is injected into a vein to see if they pass through the lungs) or a low-dose CT scan—to monitor your lungs and ensure you remain protected ^[16].