Diagnostic difference of head-up tilt table test in the patients of unexplained dizziness and syncope

Objective To probe diagnostic difference of head-up tilt table test in the patients of unexplained dizziness and syncope.Methods There were 338(male 127 and female 211) patients of unexplained dizziness and syncope aged from 4 to 70 years old(mean 24.93±16.15 years) who accepted head-up tilt table test(BHUT) at 70 degrees with power tilt table.Negative cases of them were given sublingual glyceryl trinitrate 0.2 mg and accepted sublingual nitroglycerin head-up tilt table test(SNHUT).These data were statisticsed by computer with SPSS 11.0 software.Results ①Systolic pressure,diastolic pressure,heart rate and reaction type of positive result were not different in dizziness group and syncope group(P0.05).②The positive rate of dizziness group and syncope group was 31.43%(11/35)vs 42.90%(130/303)in HUTT and 28.57%(8/28)vs 33.82%(70/207)in BHUT and 42.86%(3/7)vs 62.50%(60/96)in SNHUT(all P0.05).The positive rate was obviously higher in SNHUT than in BHUT(P0.05).③The syncope episodes occurred when standing time was slightly longer in dizziness group than in syncope group :(29.13±11.01 min) vs(23.52±12.80 min) in BHUT and(6.00±3.61 min) vs(4.98±3.51 min) after given sublingual glyceryl trinitrate in SNHUT(all P0.05).Conclusion The partial patients of unexplained dizziness resulted from vasovagal syncope but they don't show syncope attack in clinic.These patients should think highly of tilt table test.