Prediction with recurrent syncope in children of vasovagal syncope through head-up tilt table test

Objective To probe prediction of recurrent syncope in children with vasovagal syncope(VVS)through head-up tilt table test(HUTT).Methods There were 251(male 112 and female 139)patients with unexplained syncope(UPS)aged from 4 to 18(12.25±3.27)years old who came from syncope department and hospitalization of the Second Xiangya Hospital of Central South University and they were made basic head-up tilt table test(BHUT,n=251)with power tilt table.Negative cases of BHUT were given written informed consent and then given sublingual glyceryl trinitrate 0.2mg and made sublingual nitroglycerin head-up tilt table test(SNHUT,n=92).The patients were divided into three groups:A group(n=54,syncope episode only 1 time)and B group(n=137,syncope episode were 2 to 4 times)and C group(n=60,syncope episode≥5 times).These data were statistically analyzed by computer with SPSS 11.0 software.Results(1)The relationship between the positive rate of HUTT and the syncope frequency:the positive rate of BHUT was increasing with the increase of syncope frequency(χ 2=4.285,P0.05),while the positive rate of SNHUT has no linear relation with the increase of syncope frequency(χ 2=1.316,P0.05),and it was also increasing with the increase of syncope frequency about the total positive rate of HUTT(BHUT + SNHUT)in different groups(χ 2=3.809,P0.05).(2)The relationship between the reaction type and the syncope frequency:the reaction type was mainly vasoinhibition both in BHUT and SNHUT;there was no significant difference among different syncope frequency groups inBHUT(χ 2=3.008,P0.05)and in SNHUT(χ 2=2.426,P0.05).Conclusion There is no relationship between HUTT and recurrent syncope episodes.The positive rate of HUTT cannot predict recurrent syncope episodes in children with VVS.