title: [Prognosis of patients with chronic thromboembolic pulmonary hypertension receiving conservative or operative treatments according to a new clinical classification scheme].
abstract: OBJECTIVE
  To compare the efficacy of conservative or pulmonary thromboendarterectomy (PTE) therapy for chronic thromboembolic pulmonary hypertension (CTEPH) patients according to a new clinical classification scheme.
  
  
  METHODS
  This retrospective study analyzed 63 cases of CTEPH admitted to our hospital from February 1995 to October 2007 and 45 cases were treated surgically (Group A) and 18 cases received conservative therapy (Group B). Results were analyzed using Fisher exact test and t test according to San Diego medical center quartering classification scheme and Anzhen Hospital modified bifurcate classification scheme.
  
  
  RESULTS
  There were 6 operational deaths in Group A and 2 deaths during hospital stay in Group B. During follow-ups (mean 3.6 +/- 2.5 years), there were 4 deaths in Group A and 9 deaths in Group B. the totality survival rate is significantly higher in Group A than that in Group B (P < 0.05). For patients with San Diego Type I CTEPH, survival rate was significantly higher in Group A compared with Group B (P = 0.009) and was similar for patients with type II and III and IV CTEPH between the two groups (P = 0.338, 0.455, 0.800). Survival rate was significantly higher in Group A than that in Group B for patients with Anzhen central type CTEPH (P = 0.009), but was similar between the two groups for patients with Anzhen peripheral type CTEPH (P = 0.125). The Kaplan-Meier survival curve 5 years survival rate in the Group A was (91.7 +/- 8.0)% for Anzhen central type and (76.0 +/- 8.5)% for Anzhen peripheral type (P = 0.04), and the 5 years Kaplan-Meier survival rate in the Group B was (42.9 +/- 18.7)% for Anzhen central type and (56.2 +/- 10.8)% for Anzhen peripheral type (P = 0.851).
  
  
  CONCLUSIONS
  Anzhen Hospital modified bifurcate classification scheme is a simple and effective classification to predict the prognosis and choose treatment method of CTEPH.
authors.affiliation: Cardiac Surgery Department, Beijing Anzhen Hospital, Capital Medical University Beijing Institute of Heart, Lung and Blood Vessel Discase, Beijing 100029, China. ganhuili@hotmail.com
authors.forename: Hui-Li
authors.initials: HL
authors.lastname: Gan
authors.forename: Jian-Qun
authors.initials: JQ
authors.lastname: Zhang
authors.forename: Zhao-Guang
authors.initials: ZG
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.forename: Jun-Sheng
authors.initials: JS
authors.lastname: Mu
authors.forename: Qi-Wen
authors.initials: QW
authors.lastname: Zhou
authors.forename: Sheng-Xun
authors.initials: SX
authors.lastname: Wang
authors.forename: Si-Hong
authors.initials: SH
authors.lastname: Zheng
authors.forename: Guang-Fa
authors.initials: GF
authors.lastname: Zhu
authors.forename: Xiang-Feng
authors.initials: XF
authors.lastname: Zhang
authors.forename: Shuang
authors.initials: S
authors.lastname: Liu
mesh_terms: D000328:Adult; D002908:Chronic Disease; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000401:mortality / Q000601:surgery* / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011655:Pulmonary Embolism / Q000601:surgery* / Q000628:therapy*; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome