Clinical Scorecard: APT may fall short in pulsatile tinnitus
At a Glance
Category
Detail
Condition
Subjective pulsatile tinnitus
Key Mechanisms
Ambient pressure tympanometry (APT) assesses tympanometric waveform patterns for pulse synchrony; the study evaluated its ability to detect radiologic correlates and surgeon-defined diagnoses.
Target Population
Adults with subjective pulsatile tinnitus who underwent APT at a tertiary care clinic.
In 107 adults, APT sensitivity and specificity for any radiologic correlate were 51% and 57%, respectively.
Against surgeon-defined diagnoses, APT sensitivity was 43% and specificity was 55%.
Results were similar in the subgroup of 86 patients whose primary complaint was pulsatile tinnitus.
Some surgeon diagnoses had no identified radiologic correlate, including middle ear myoclonus and Eustachian tube dysfunction.
The study authors advised pursuing imaging regardless of a negative APT tracing.
Guideline-Based Recommendations
Diagnosis
Interpret APT results in the context of clinical assessment, imaging, and surgeon-defined diagnoses; the study found limited screening performance.
Management
Study authors recommended pursuing imaging even when the APT tracing is negative.
Monitoring & Follow-up
Risks
A negative APT tracing may not exclude a radiologic correlate; sensitivity was 51% in the full cohort.
Radiologic interpretations and surgeon diagnoses did not always agree, and some diagnosed sources were not identifiable through imaging.
Patient & Prescribing Data
Retrospective single-center cohort of 107 adults with subjective pulsatile tinnitus who underwent APT from December 2021 through May 2025; a subgroup analysis included 86 patients with pulsatile tinnitus as the primary complaint.
No treatment or prescribing outcomes were reported. APT had limited sensitivity and specificity for radiologic correlates and surgeon-defined diagnoses.
Clinical Best Practices
Do not use a negative APT tracing alone to determine that imaging is unwarranted, consistent with the study authors’ recommendation.
Consider that radiologic findings may not capture all clinically diagnosed sources of pulsatile tinnitus.
Interpret the findings with awareness of the study’s retrospective, single-center design and variability in APT collection, classification, and imaging.
