title: Acute hemodynamic responses to supplemental oxygen and their prognostic implications in pulmonary hypertension.
abstract: BACKGROUND
  Pulmonary hypertension (PH) of various causes leads to a poor prognosis. Pulmonary vasoreactivity testing during right heart catheterization (RHC) has prognostic and therapeutic consequences.
  
  
  OBJECTIVE
  To characterize the acute hemodynamic response to short-term oxygen supplementation (SHOT) in adult PH patients and its impact on prognosis.
  
  
  METHODS
  After a stable baseline period, 104 patients with PH [pulmonary arterial hypertension (PAH; n = 56), chronic thromboembolic (PH; n = 22) or respiratory diseases (PH; n = 26)], who were mainly therapy-naïve (86.5%) (mean pO2 64.5 ± 1.2 mm Hg), received a standardized SHOT during RHC and hemodynamic response was assessed for its prognostic potential.
  
  
  RESULTS
  SHOT significantly reduced heart rate (HR: 78.9 ± 1.5 to 74 ± 1.5 beats/min), cardiac output (4 ± 0.1 to 3.8 ± 0.1 l/min), pulmonary arterial pressure (46.4 ± 1.3 to 42.3 ± 1.3 mm Hg) and pulmonary vascular resistance (10.1 ± 0.5 to 9.6 ± 0.5 Wood units; all p < 0.001) compared to baseline. The magnitude of this effect varied between the different PH groups. During a median follow-up of 25.1 months (range: 0.2-73.3 months), HR <72 beats/min in response to SHOT was associated with a better prognosis in patients with PH due to chronic thromboembolism to the lung and PH from chronic lung disease.
  
  
  CONCLUSIONS
  SHOT leads to characteristic hemodynamic responses across different forms of PH. The preserved capability to acutely respond to SHOT with HR reduction is of prognostic significance in patients with non PAH PH.
authors.affiliation: Division of Pulmonary Diseases, Department of Internal Medicine I, Ludwig Maximilians University, Klinikum Grosshadern, Munich, Germany. hanno.leuchte@me.com
authors.forename: Hanno H
authors.initials: HH
authors.lastname: Leuchte
authors.forename: Carlos J
authors.initials: CJ
authors.lastname: Baezner
authors.forename: Rainer A
authors.initials: RA
authors.lastname: Baumgartner
authors.forename: Philipp
authors.initials: P
authors.lastname: Mernitz
authors.forename: Claus
authors.initials: C
authors.lastname: Neurohr
authors.forename: Jürgen
authors.initials: J
authors.lastname: Behr
mesh_terms: D000328:Adult; D006328:Cardiac Catheterization / Q000379:methods; D005260:Female; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D006976:Hypertension, Pulmonary / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000628:therapy; D000860:Hypoxia / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology; D008168:Lung / Q000098:blood supply / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D010100:Oxygen / Q000378:metabolism / Q000627:therapeutic use*; D010101:Oxygen Consumption; D010102:Oxygen Inhalation Therapy / Q000379:methods*; D011379:Prognosis; D011652:Pulmonary Circulation / Q000187:drug effects*; D016896:Treatment Outcome; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D010100:Oxygen