title: [Clinical characteristics of orthostatic hypertension with hemodynamic response of vasovagal syncope and postural orthostatic tachycardia syndrome in children and adolescents].
abstract: OBJECTIVE
  To analyze the clinical characteristics of orthostatic hypertension (OHT) with hemodynamic response of vasovagal syncope (VVS) and postural orthostatic tachycardia syndrome (POTS) in children and adolescents.
  
  
  METHODS
  Children and adolescents admitted to the Second Xiangya Hospital from July 2008 to April 2015 were included, and divided into three groups according to the results of head-up tilt test (HUTT): OHT group, OHT+ VVS group, OHT+ POTS group. The clinical characteristics were analyzed.
  
  
  RESULTS
  Totally 629 cases were included, 300 cases in OHT group, 264 cases in OHT+ VVS group and 65 cases in OHT+ POTS group. Syncope and dizziness were the main symptoms of the three groups, and the proportion of patients complaining syncope in OHT+ VVS group was higher than that in OHT group (49.6% vs. 35.7%, χ(2)=11.211, P<0.05) and in OHT+ POTS group (49.6% vs. 27.7%, χ(2)=10.123, P<0.05). Baseline heart rate (HR)((78±14) beat/min vs. (77±12) beat/min, t=2.570, P<0.05), HUTT 3 min HR ((100±14) beat/min vs. (94±13) beat/min, t=17.464, P<0.05) and ΔHR ((22±12) beat/min vs. (17±9) beat/min, t=19.303, P<0.05) were higher in OHT+ VVS group than in OHT group. When compared with OHT group, baseline systolic blood pressure (SBP) ((105±10) mmHg(1 mmHg=0.133 kPa) vs. (103±10) mmHg, t=4.918, P<0.05), HUTT 3 min SBP((114±10) mmHg vs. (113±11) mmHg, t=4.046, P<0.05), baseline diastolic blood pressure (DBP)((64±6) mmHg vs. (63±7) mmHg, t=2.618, P<0.05), HUTT 3 min DBP((78±8) mmHg vs. (77±8) mmHg, t=3.302, P<0.05), HUTT 3 min HR ((107±14) beat/min vs. (94±13) beat/min, t=24.229, P<0.05) and ΔHR ((32±11) beat/min vs. (17±9) beat/min, t=39.146, P<0.05) in OHT+ POTS group were significantly higher, and baseline HR((75±14) beat/min vs. (77±12) beat/min, t=-4.221, P<0.05)in OHT+ POTS group was lower.
  
  
  CONCLUSIONS
  OHT with higher supine HR, upright HR and HR change is more susceptible to being complicated with VVS, while OHT with higher supine and upright SBP, higher supine and upright DBP and lower supine HR is more susceptible to being accompanied by POTS.
authors.affiliation: Department of Pediatric Cardiovascular Diseases, Children's Medical Center, Second Xiangya Hospital of Central South University, Changsha 410011, China.
authors.forename: R M
authors.initials: RM
authors.lastname: Zou
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: L J
authors.initials: LJ
authors.lastname: Wu
authors.forename: X M
authors.initials: XM
authors.lastname: Luo
authors.forename: P
authors.initials: P
authors.lastname: Lin
authors.forename: F
authors.initials: F
authors.lastname: Li
authors.forename: Z W
authors.initials: ZW
authors.lastname: Xie
mesh_terms: D000293:Adolescent; D001794:Blood Pressure; D002648:Child; D004244:Dizziness / Q000150:complications; D006339:Heart Rate; D006439:Hemodynamics; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D054972:Postural Orthostatic Tachycardia Syndrome / Q000503:physiopathology*; D019462:Syncope, Vasovagal / Q000503:physiopathology*; D018667:Tilt-Table Test