title: Pulmonary artery denervation to treat pulmonary arterial hypertension: the single-center, prospective, first-in-man PADN-1 study (first-in-man pulmonary artery denervation for treatment of pulmonary artery hypertension).
abstract: OBJECTIVE
  This study was designed to test the safety and efficacy of pulmonary artery (PA) denervation (PADN) for patients with idiopathic PA hypertension (IPAH) not responding optimally to medical therapy.
  
  
  BACKGROUND
  Baroreceptors and sympathetic nerve fibers are localized in or near the bifurcation area of the main PA. We previously demonstrated that PADN completely abolished the experimentally elevated PA pressure responses to occlusion of the left interlobar PA.
  
  
  METHODS
  Of a total of 21 patients with IPAH, 13 patients received the PADN procedure, and the other 8 patients who refused the PADN procedure were assigned to the control group. PADN was performed at the bifurcation of the main PA, and at the ostial right and left PA. Serial echocardiography, right heart catheterization, and a 6-min walk test (6MWT) were performed. The primary endpoints were the change of PA pressure (PAP), tricuspid excursion (Tei) index, and 6MWT at 3 months follow-up.
  
  
  RESULTS
  Compared with the control group, at 3 months follow-up, the patients who underwent the PADN procedure showed significant reduction of mean PAP (from 55 ± 5 mm Hg to 36 ± 5 mm Hg, p < 0.01), and significant improvement of the 6MWT (from 324 ± 21 m to 491 ± 38 m, p < 0.006) and of the Tei index (from 0.7 ± 0.04 to 0.50 ± 0.04, p < 0.001).
  
  
  CONCLUSIONS
  We report for the first time the effect of PADN on functional capacity and hemodynamics in patients with IPAH not responding optimally to medical therapy. Further randomized study is required to confirm the efficacy of PADN. (First-in-Man Pulmonary Artery Denervation for Treatment of Pulmonary Artery Hypertension [PADN-1] study; chiCTR-ONC-12002085).
authors.affiliation: Cardiological Department, Nanjing First Hospital, Nanjing Medical University, Nanjing, China; Cardiological Department, Nanjing Heart Center, Nanjing, China. Electronic address: chmengx@126.com.
authors.forename: Shao-Liang
authors.initials: SL
authors.lastname: Chen
authors.affiliation: Cardiological Department, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Feng-Fu
authors.initials: FF
authors.lastname: Zhang
authors.affiliation: Cardiological Department, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.affiliation: Cardiological Department, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Du-Jiang
authors.initials: DJ
authors.lastname: Xie
authors.affiliation: Cardiological Department, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Zhou
authors.affiliation: St. Mary Medical Center, Hobart, Indiana.
authors.forename: Thach
authors.initials: T
authors.lastname: Nguyen
authors.affiliation: Cardiovascular Research Foundation, New York, New York.
authors.forename: Gregg W
authors.initials: GW
authors.lastname: Stone
mesh_terms: D000328:Adult; D006328:Cardiac Catheterization; D004452:Echocardiography; D057510:Endovascular Procedures; D005080:Exercise Test; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011311:Pressoreceptors / Q000601:surgery; D011446:Prospective Studies; D011651:Pulmonary Artery / Q000294:innervation*; D013562:Sympathectomy; D016896:Treatment Outcome
keywords: 6-min walk test; 6MWT; CO; IPAH; MPA; N-terminal brain natriuretic peptide; NT-BNP; PA; PADN; PAH; PAOP; PAP; PVR; RA; RV; TPG; Tei; cardiac output; denervation; idiopathic pulmonary arterial hypertension; main pulmonary artery; pulmonary artery; pulmonary artery denervation; pulmonary artery hypertension; pulmonary artery occlusive pressure; pulmonary artery pressure; pulmonary vascular resistance; right atrium/atrial; right ventricle/ventricular; transpulmonary pressure gradient; tricuspid excursion index