In the present study, the corrected QT interval (QTc) was measured in a healthy sample in Changsha, China. The findings were that the peak incidences of long and short QTc existed in two separate groups in the healthy sample.

We report the results of a retrospective cross-sectional study of 2089 children referred for syncope of unknown origin and pre-syncope symptoms. We noted that orthostatic hypertension existed in 23.84% out of these 2089 children. Orthostatic hypertension frequency was higher in males and those ≥ 12 years of age. In orthostatic hypertensive children, head-up tilt test positive rate was higher in females and those ≥ 12 years of age. Since orthostatic hypertension, as an orthostatic blood pressure regulation disorder, is not as well studied as orthostatic hypotension, we believe that our findings could be of interest to the readers of your journal.