[Positional vertigo. Symptom, clinical sign, or disease?]. / Vértigo posicional. Síntoma, signo o enfermedad?

ABSTRACT

INTRODUCTION: We present a prospective study with the aim of assessing the differences found between position-triggered vertiginous syndromes, those diagnosed as benign paroxysmal positional vertigos (BPPV) in primary care and non-specific clinics, and those classified as BPPV at an otoneurology unit. PATIENTS AND METHOD: Over a 17 month period, 432 consecutive patients were included after evaluation at a otoneurology unit receiving all referrals for vestibular pathologies. The existence of trigger factors was investigated, as was the distribution of the diagnoses associated with a positional trigger. The characteristics of the patients with a final diagnosis of BPPV were also studied. RESULTS: Of this population, 217 patients (50.23%) reported a positional change as the trigger for their symptoms, 106 (24.53%) were referred from their initial care centres with a diagnosis of BPPV, and 128 (29.62%) were classified as truly BPPV. The coincidence between the preliminary diagnosis and the definitive one was 52.8%. A history of positional paroxysmal vertigo during seconds was linked to BPPV in 78% of cases. Only in 4.7% of the BPPV cases diagnosed at the otoneurology unit had provoking manoeuvres been performed. CONCLUSIONS: We have found that an adequate anamnesis is capable of providing accurate guidance for diagnostic purposes in most cases of BPPV, but the performance of provoking manoeuvres and the correct specific treatment for this pathology is of paramount importance when classifying a patient with suspected BPPV.