[Causes of unexplained syncope in children].

Objective: To investigate the common causes of unexplained syncope in children.

Methods: A total of 434 children with unexplained syncope who were aged from 3.0 to 17.

[Application of the head-up tilt table test in children under 6 years old].

Objective: To study the clinical value and safety of the head-up tilt table test (HUTT) in children under 6 years old.

Methods: The HUTT results between September 2000 and August 2011 of 144 2 to 6-year-old children (81 boys and 63 girls) with syncope and dizziness of unknown causes were retrospectively studied.

Results: Eight children completed the based tilt table test and 136 cases completed the sublingual nitroglycerin tilt table test.

[Arrhythmia after a positive head-up tilt table test].

Objective: to study the characteristics of arrhythmia after a positive head-up tilt table test (HUTT).

Methods: head-up tilt table test (BHUT) or sublingual nitroglycerin-provocation head-up tilt table test (SNHUT) were performed in 1374 patients at the Second Xiangya Hospital of Central South University from March of 2001 to August of 2009. Arrhythmias were recorded in 169 patients after a positive HUTT [57 male, age 6 - 65 years, 86 children < 18 years, mean age (23.

[Clinical analysis of vasovagal syncope in children].

Objective: To study the changes in clinical features of vasovagal syncope (VVS) in children.

Methods: From January 2000 to September 2009, 841 children with unexplained syncope or prodromata were enrolled. They were assigned to two groups according to the period of visiting hospital: group A (from January 2000 to December 2004, n=129) and group B (from January 2005 to September 2009, n=712).

[Efficacy of midodrine hydrochloride in the treatment of children with vasovagal syncope].

Objective: To explore the efficacy of midodrine hydrochloride in the treatment of vasovagal syncope (VVS) in children.

Methods: Forty-eight children with unexplained syncope and prodromata (21 males, 27 females, aged 6 -17 years, mean 11 years +/- 3 years) were randomly assigned into 3 groups. They were health education group, cresol group and midodrine hydrochloride group respectively.