Diagnostic Approach to Vertigo

Imaging and Diagnostic Testing

The American College of Radiology guidelines recommend that patients with symptoms of triggered episodic vertigo but negative or atypical Dix-Hallpike testing are at increased risk of having an acute central cause of vertigo identified on imaging, which may include mass lesions, hemorrhage, infarct, and demyelinating disease 1
MRI brain is preferred over CT due to superior soft tissue contrast, and has been shown to detect acute brain lesions in 11% of cases compared with only 6% detection rate with CT in patients with central positional vertigo 1

The American Academy of Otolaryngology-Head and Neck Surgery recommends vestibular function testing in patients with atypical nystagmus, suspected additional vestibular pathology, failed response to CRP, or frequent recurrences of BPPV 2
The Dix-Hallpike test should be performed with the patient's head rotated 45 degrees to the side being tested, and the patient guided to the supine position with the head extending slightly over the edge of the table, while supporting the head and observing for nystagmus and vertigo symptoms 3
Positive test criteria include torsional, upbeating nystagmus provoked by the test, latency period, vertigo and nystagmus that increase and resolve within 60 seconds, and characteristic crescendo-decrescendo pattern of nystagmus in patients undergoing the Dix-Hallpike maneuver 2
The Dix-Hallpike test has a sensitivity of 82% and specificity of 71% in patients with suspected BPPV, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 2, 3
A negative Dix-Hallpike test does not necessarily rule out BPPV, with a negative predictive value of only 52% in primary care patients with suspected BPPV 2

Canalith repositioning procedures, like the Epley maneuver, should be performed when the test is positive, even if subjective vertigo has resolved, with a high success rate of around 80% with only 1-3 treatments, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 2, 3
The Epley maneuver has a specific set of steps to be performed, including positioning the patient upright with head turned 45° toward the affected ear, rapidly moving the patient to supine head-hanging position, and turning the head 90° toward the unaffected side 3
The Semont maneuver can be considered as an alternative to the Epley maneuver if it is not feasible due to patient limitations, with comparable efficacy in patients with BPPV 2

The test should be avoided in patients with severe cervical spine disease, cervical instability, or recent neck injury, as well as those with vertebrobasilar insufficiency or severe cardiac disease that limits positioning 3
Frail elderly patients should have their vital signs monitored during and after the procedure 3
Patients with physical limitations, such as cervical spine problems, obesity, or mobility issues, may require additional assistance during the maneuver and special tilting examination tables may be necessary 3
Antiemetic prophylaxis may be considered 30-60 minutes before CRP for patients with severe nausea/vomiting during diagnostic testing 2

Neuroimaging and vestibular testing are not recommended for patients who meet diagnostic criteria for BPPV without additional signs or symptoms inconsistent with BPPV, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 2, 4
Consider neuroimaging or vestibular testing when the clinical presentation is atypical, Dix-Hallpike testing elicits equivocal or unusual nystagmus, diagnosis remains unclear after positional testing, or additional symptoms beyond those attributable to BPPV are present 2
Routine neuroimaging is not justified in typical BPPV cases and does not improve diagnostic accuracy 2
Always consider other causes of vertigo when presentation is atypical 2, 4

Common pitfalls in BPPV management include failure to identify the correct canal, inadequate technique, premature termination of treatment, relying solely on medications, and unnecessary imaging 2, 3
Mild, self-limiting adverse effects, including nausea, vomiting, and a sense of falling, occur in about 12% of treated patients, but no serious complications have been identified in multiple RCTs 3
Approximately 50% of patients report subjective imbalance between episodes, emphasizing the importance of patient education and follow-up in patients with BPPV 3