[Rapid screening questionnaire based on clinical symptoms of patientswith benign paroxysmal positional vertigo]

Objective:To fomulate a rapid screening questionnaire for benign paroxysmal positional vertigo (BPPV) according to the symptoms of patients with BPPV. Method:A total of 276 patients with dizziness participated in this study, and 219 cases were included in the questionnaire validity evaluation except for 48 patients who participated in the revision of the questionnaire and 9 patients with inconsistent diagnosis. Subjects were divided into BPPV group and non-BPPV group according to the diagnostic criteria. ①All patients completed questionnaires based on positional dizziness, and the differences between the two groups were compared. ②Reliability test adopted test-retest reliability and Cronbach's α coefficient; content validity adopted expert judgment method, and structural validity adopted factor analysis. Result:①Reliability test: test-retest reliability was 0.945, Cronbach's α coefficient was 0.649. Validity test: KMO value was 0.720. Two factors were used with a characteristic root of higher than 0.9. The total cumulative contribution rate was 61.2%. ②Results of the questionnaire: The patients who developed dizziness when getting up/down or turning over in bed, accounted for 78(94.0%) in the BPPV group and 57(41.9%) in the non-BPPV group, with a statistical difference (P<0.01). In the cases of vertigo, there were 82 cases (98.8%) in the BPPV group and 96 cases (70.6%) in the non-BPPV group, with a statistical difference (P<0.01). There were 65 cases (78.3%) in the BPPV group and 53 cases (39.0%) in the non-BPPV group with dizziness/vertigo attack time less than 1 minute, with a statistical difference (P<0.01). Patients who had hearing loss or tinnitus during the dizziness episode accounted for 8(9.6%) in the BPPV group and 31 (22.8%) in the non-BPPV group, with a statistically difference (P<0.05). The patients with consciousness during dizziness episode were in 79 patients (95.2%) in the BPPV group and 128 patients (94.1%) in the non-BPPV group, with no statistical difference (P>0.05). Conclusion:This questionnaire has clinical applicability and can be used for rapid differential screening of BPPV in patients with dizziness.