Stanford IR's Dr. Lynne Martin on PAVM Treatment

Stanford IR's Dr. Lynne Martin on PAVM Treatment

This episode covers the critical paradigm shift in treating Pulmonary Arteriovenous Malformations (PAVMs) as detailed by Dr. Lynne Martin from Stanford Interventional Radiology. We discuss why the old "block the pipe" method is obsolete and how to achieve durable, definitive occlusion.

• The Silent Neurological Threat: We explore why intervention isn't about hypoxia—it's about preventing paradoxical emboli. With stroke risks up to 32% and a 40-50% prevalence of silent brain infarctions, the lung's broken filter puts the brain directly in the firing line.

• The Odontogenic Connection: A crucial clinical pearl: routine dental cleanings can cause brain abscesses in PAVM patients because transient oral bacteria bypass the lung filter. Lifetime antibiotic prophylaxis for dental work is mandatory.

• The "3mm Myth": The old rule of only treating feeding arteries >3mm is dead. Modern guidelines dictate that any measurable, safely catheterizable PAVM—even 2mm feeders—must be treated, as they still carry significant stroke and abscess risk.

• Why Proximal Coiling Fails (The Jailed Nidus): Placing a coil proximally creates a low-pressure, ischemic environment that triggers massive VEGF release, recruiting tiny collateral vessels to feed the sac. This creates a "jailed nidus"—a growing AVM that is now impossible to access and treat.

• The New Standard ("Pack the Bucket"): Dr. Martin advocates for complete mechanical occlusion of the nidus itself using soft, high-volume detachable coils ("liquid metal"). We discuss why vascular plugs are contraindicated inside the sac and how to hunt for the hidden systemic feeders (bronchial/intercostal arteries) that cause recurrence.

Tune in to learn why we are moving away from being "catheter plumbers" and how to definitively protect your PAVM patients.