title: Pulse-pressure variation and hemodynamic response in patients with elevated pulmonary artery pressure: a clinical study.
abstract: BACKGROUND
  Pulse-pressure variation (PPV) due to increased right ventricular afterload and dysfunction may misleadingly suggest volume responsiveness. We aimed to assess prediction of volume responsiveness with PPV in patients with increased pulmonary artery pressure.
  
  
  METHODS
  Fifteen cardiac surgery patients with a history of increased pulmonary artery pressure (mean pressure, 27 +/- 5 mm Hg (mean +/- SD) before fluid challenges) and seven septic shock patients (mean pulmonary artery pressure, 33 +/- 10 mm Hg) were challenged with 200 ml hydroxyethyl starch boli ordered on clinical indication. PPV, right ventricular ejection fraction (EF) and end-diastolic volume (EDV), stroke volume (SV), and intravascular pressures were measured before and after volume challenges.
  
  
  RESULTS
  Of 69 fluid challenges, 19 (28%) increased SV > 10%. PPV did not predict volume responsiveness (area under the receiver operating characteristic curve, 0.555; P = 0.485). PPV was >or=13% before 46 (67%) fluid challenges, and SV increased in 13 (28%). Right ventricular EF decreased in none of the fluid challenges, resulting in increased SV, and in 44% of those in which SV did not increase (P = 0.0003). EDV increased in 28% of fluid challenges, resulting in increased SV, and in 44% of those in which SV did not increase (P = 0.272).
  
  
  CONCLUSIONS
  Both early after cardiac surgery and in septic shock, patients with increased pulmonary artery pressure respond poorly to fluid administration. Under these conditions, PPV cannot be used to predict fluid responsiveness. The frequent reduction in right ventricular EF when SV did not increase suggests that right ventricular dysfunction contributed to the poor response to fluids.
authors.affiliation: Department of Intensive Care Medicine, Bern University Hospital and University of Bern Inselspital, Freiburgstrasse 10, 3010 Bern, Switzerland. Moritz.WylervonBallmoos@childrens.harvard.edu
authors.forename: Moritz
authors.initials: M
authors.lastname: Wyler von Ballmoos
authors.forename: Jukka
authors.initials: J
authors.lastname: Takala
authors.forename: Margareta
authors.initials: M
authors.lastname: Roeck
authors.forename: Francesca
authors.initials: F
authors.lastname: Porta
authors.forename: David
authors.initials: D
authors.lastname: Tueller
authors.forename: Christoph C
authors.initials: CC
authors.lastname: Ganter
authors.forename: Ralph
authors.initials: R
authors.lastname: Schröder
authors.forename: Hendrik
authors.initials: H
authors.lastname: Bracht
authors.forename: Bertram
authors.initials: B
authors.lastname: Baenziger
authors.forename: Stephan M
authors.initials: SM
authors.lastname: Jakob
mesh_terms: D000368:Aged; D019540:Area Under Curve; D001794:Blood Pressure / Q000502:physiology*; D002986:Clinical Trials as Topic; D005440:Fluid Therapy; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008991:Monitoring, Physiologic; D011237:Predictive Value of Tests; D011651:Pulmonary Artery / Q000502:physiology*; D012772:Shock, Septic; D013318:Stroke Volume / Q000502:physiology*; D013557:Switzerland; D013903:Thoracic Surgery; D018497:Ventricular Dysfunction, Right / Q000503:physiopathology