title: Different time course of changes in tricuspid regurgitant pressure gradient and pulmonary artery flow acceleration after pulmonary thromboendarterectomy: implications for discordant recovery of pulmonary artery pressure and compliance.
abstract: BACKGROUND
  Pulmonary artery pressure (PAP) is reduced dramatically after pulmonary thromboendarterectomy in patients with chronic thromboembolic pulmonary hypertension (CTEPH). However, it is unclear whether pulmonary artery compliance increases in conjunction with the reduction in PAP. Pulmonary artery compliance may affect right ventricular afterload and prognosis.
  
  
  RESULTS
  In 33 patients with CTEPH (9 men, 22-76 years), changes in the tricuspid regurgitation pressure gradient (TRPG) and the acceleration time (ACT) of pulmonary artery flow (a surrogate parameter of pulmonary artery compliance) were examined before and after pulmonary thromboendarterectomy using echocardiography to clarify factors affecting the changes. At 6 months, both TRPG and ACT normalized (<or=30 mmHg, >or=100 ms, respectively) in 25 patients (group A) but not in 8 (group B). In group B, there were 5 with normal TRPG and shortened ACT at 6 months that normalized at 17+/-3 months. Group A patients showed shorter disease period and shorter period without anticoagulation than group B patients (p=0.04, 0.02 respectively). All patients in group A had the proximal type, and 2 patients of group B had the distal type (p=0.05). Clinical improvement was more remarkable in group A.
  
  
  CONCLUSIONS
  The recovery of PAP and the ACT of pulmonary artery flow was not always concordant after pulmonary thromboendarterectomy, suggesting a presence of a time lag in the recovery between pressure and compliance in some patients. A long period of CTEPH, a long period without anticoagulation and the distal embolism type may be predictive factors of an unfavorable operative result with reduced pulmonary artery compliance, and hence poor recovery of clinical performance.
authors.affiliation: Second Department of Internal Medicine, Kansai Medical University, Moriguchi, Japan.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Maeba
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakatani
authors.forename: Motoaki
authors.initials: M
authors.lastname: Sugawara
authors.forename: Jun
authors.initials: J
authors.lastname: Mimura
authors.forename: Norifumi
authors.initials: N
authors.lastname: Nakanishi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ogino
authors.forename: Masafumi
authors.initials: M
authors.lastname: Kitakaze
authors.forename: Toshiji
authors.initials: T
authors.lastname: Iwasaka
authors.forename: Kunio
authors.initials: K
authors.lastname: Miyatake
mesh_terms: D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology; D004691:Endarterectomy; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000503:physiopathology* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011651:Pulmonary Artery / Q000503:physiopathology*; D012039:Regional Blood Flow / Q000502:physiology; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome; D014262:Tricuspid Valve Insufficiency / Q000503:physiopathology*; D016278:Ventricular Function, Right / Q000502:physiology