ulsatile tinnitus (PT) is a symptom referring to an abnormal perception of rhythmic sound without an extracorporeal source, affecting between 3 and 5 million Americans. [1][2][3][4] Pulsatile tinnitus can have a negative effect on patients' psychological and physical health, leading to insomnia, anxiety, depression, and poor concentration. 5 Seeking an underlying cause of PT is essential because many of them pose a significant risk of stroke, blindness, or deafness. Hence, some of the causes of PT warrant treatment to mitigate risk to cerebrovascular, otologic, or ophthalmologic health, whereas other causes may be treated to address the symptom itself and its psychiatric comorbidities. This review describes our diagnostic approach to PT. Rather than providing a detailed list of possible diagnoses, our goal is to provide an approach for physicians to evaluate patients with PT.
ObservationsOur diagnostic approach categorizes causes of PT into structural, metabolic, and vascular groups (Table ). This categorization facilitates appropriate and practical diagnostic evaluation, referral, and treatment in a patient-centric fashion rather than focusing on anatomic compartments alone.
PathophysiologyPulsatile tinnitus often originates from vascular structures in the head or neck in proximity to the cochlea. 6 Alternatively, normal sounds within the body can be perceived more intensely because of inner ear alterations to sound conduction, or loss of masking ability.
Clinical PresentationUnlike nonpulsatile tinnitus, an underlying cause of PT can be identified in more than 70% of patients with a thorough evaluation. 7 Careful attention to a patient's medical history and examination can often lead to a correct diagnosis. The initial clinical counter should record the PT's onset, progression, severity, and exacerbating or mitigating positions, movements, or other factors. The history should also include any associated symptoms, particularly hearing loss, headache (also including any positional component), vision changes, vertigo, anxiety, or depression, and, crucially, assess the effect on the patient's life. For example, in patients with a history of recent neck manipulation, arterial dissection should be suspected and one should have a low threshold to initiate low-dose aspirin for stroke prevention, even if the diagnosis is not yet confirmed. The PT itself should be further characterized by synchronicity with the patient's heartbeat and pitch. Pulse-synchronous PT is often related to abnormal vascular flow in structures near the cochlea. 6 Specifically, abnormal blood flow in the transverse sinus, sigmoid sinus, internal jugular vein, or condylar veins can stimulate the inner hair cells of the cochlea and result in PT. However, pulse-asynchronous PT (without concomitant atrial fibrillation) is usually associated with a mechanical rather than a vascular cause. Specifically, normal sounds within IMPORTANCE Pulsatile tinnitus is a debilitating symptom affecting millions of Americans and can be a harbinger of hemorrhagic or is...