Pulsatile Tinnitus and Venous Sinus Stenosis

Overview

Pulsatile tinnitus is a rhythmic sound that may seem to match the heartbeat. Unlike common nonpulsatile tinnitus, pulsatile tinnitus may reflect an underlying vascular cause. One important cause is venous sinus stenosis, a narrowing in the brain’s venous drainage channels. Another important cause is a dural AV fistula, which must be considered because management differs and some fistulas carry significant risk.

Symptoms and associated issues

Patients may describe:

Hearing a whooshing or heartbeat sound.
Symptoms that change with head position or gentle neck pressure.
Visual symptoms.
Pressure-related symptoms, especially when intracranial venous outflow issues are involved.

Why the workup matters

Pulsatile tinnitus is a symptom, not a final diagnosis. The workup may involve:

ENT evaluation in some cases.
MRI/MRA or CT/CTA.
MRV or CTV to assess venous anatomy.
Review for signs of venous sinus stenosis, idiopathic intracranial hypertension, or dural AV fistula.
Diagnostic cerebral angiography and venography in selected patients when noninvasive imaging is incomplete or when intervention is being considered.

When venous sinus stenosis may be relevant

Venous sinus stenosis refers to narrowing of a dural venous sinus, often the transverse or sigmoid sinus. In selected patients, that narrowing can contribute to altered venous flow dynamics and symptoms such as pulsatile tinnitus, headaches, or signs of raised intracranial pressure.

Treatment

Treatment depends on the cause.

Observation and workup completion

If symptoms are mild or the diagnosis remains uncertain, observation and further evaluation may be appropriate before any intervention is considered.

Treat the underlying lesion

If the real cause is a dural AV fistula, aneurysmal issue, or other vascular abnormality, treatment should target that lesion rather than the symptom.

Venous sinus stenting

In patients with symptomatic venous sinus stenosis, venous sinus stenting can be a minimally invasive treatment option. Through a catheter-based approach, a stent is placed across the narrowed venous segment to improve outflow and reduce abnormal flow turbulence or pressure gradients.