RESUMO
Objective To observe and assess the positive rate and accuracy of 'bow and lean test' in the horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV). Methods Ninety-two HSC-BPPV patients who were diagnosed by head roll test (HRT) were enrolled, and then further tested with 'bow and lean test' (BLT) between Oct 1, 2010 and Sep 30, 2011. They were treated by Barbecue maneuver or Brandt-Daroff exercise on the basis of HRT and BLT tests. The positive rate of BLT test was analyzed, and its accuracy for diagnosis and success rate for treatment of HSC-BPPV were compared between HRT and BLT. Results Among the 92 patients, 83(90.2%) of them showed BLT nystagmus. Fifty-seven of 83 (68.7%) patients showed both bowing nystagmus and leaning nystagmus, and 18(21.7%) and 8(9.6%) respectively showed bowing nystagmus alone or leaning nystagmus alone. Among 92 patients, 74(80.4%) of them the affected side could be determined by HRT with 69 BLT positive and 5 BLT negative. Among the 69 BLT-positive patients, 60 patients showed the same result of HRT, and successful result was achieved by manipulation. 9 patients showed different result between BLT and HRT, in whom manipulation failed according to the result of HRT, but succeeded when manipulation was performed according to BLT. In 18 patients(19.6%) it was not able to determine the affected side by HRT, but in 14 patients manipulation was successful when BLT result was applied. In 4 patients BLT failed to evoke nystagmus, but after practicing Brandt-Daroff exercise, vertigo and HRT nystagmus disappeared 3 days later. Among the 92 patients, 65(70.7%) were cured according to HRT, while 83(90.2%) got successful result according to BLT(P<0.05). Conclusion The positive rate and accuracy for HSC-BPPV by BLT are high. It is a useful method for determining the affected side in HSC-BPPV, and to provide the basis for selecting effective manipulation treatment.
RESUMO
Objective To observe and assess the positive rate and accuracy of 'bow and lean test' in the horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV). Methods Ninety-two HSC-BPPV patients who were diagnosed by head roll test (HRT) were enrolled, and then further tested with 'bow and lean test' (BLT) between Oct 1, 2010 and Sep 30, 2011. They were treated by Barbecue maneuver or Brandt-Daroff exercise on the basis of HRT and BLT tests. The positive rate of BLT test was analyzed, and its accuracy for diagnosis and success rate for treatment of HSC-BPPV were compared between HRT and BLT. Results Among the 92 patients, 83(90.2%) of them showed BLT nystagmus. Fifty-seven of 83 (68.7%) patients showed both bowing nystagmus and leaning nystagmus, and 18(21.7%) and 8(9.6%) respectively showed bowing nystagmus alone or leaning nystagmus alone. Among 92 patients, 74(80.4%) of them the affected side could be determined by HRT with 69 BLT positive and 5 BLT negative. Among the 69 BLT-positive patients, 60 patients showed the same result of HRT, and successful result was achieved by manipulation. 9 patients showed different result between BLT and HRT, in whom manipulation failed according to the result of HRT, but succeeded when manipulation was performed according to BLT. In 18 patients(19.6%) it was not able to determine the affected side by HRT, but in 14 patients manipulation was successful when BLT result was applied. In 4 patients BLT failed to evoke nystagmus, but after practicing Brandt-Daroff exercise, vertigo and HRT nystagmus disappeared 3 days later. Among the 92 patients, 65(70.7%) were cured according to HRT, while 83(90.2%) got successful result according to BLT(P<0.05). Conclusion The positive rate and accuracy for HSC-BPPV by BLT are high. It is a useful method for determining the affected side in HSC-BPPV, and to provide the basis for selecting effective manipulation treatment.