title: Platelet distribution width and mean platelet volume in idiopathic pulmonary arterial hypertension.
abstract: BACKGROUND
  Previous studies have demonstrated that platelet activation occurs in patients with pulmonary arterial hypertension (PAH). Mean platelet volume (MPV) and platelet distribution width (PDW) are two markers of platelet activation, and have recently been recognised as risk predictors of cardiovascular diseases. This study aimed to investigate whether MPV and PDW would be useful to reflect disease severity and predict prognosis in idiopathic PAH (IPAH).
  
  
  METHODS
  MPV and PDW levels were measured in 82 IPAH patients without antiplatelet or anticoagulant treatment on admission and 82 healthy controls. Concurrent collected data included clinical, haemodynamic and biochemical variables. All patients were followed-up from the date of blood testing. The endpoint was all-cause mortality.
  
  
  RESULTS
  MPV and PDW were significantly higher in patients with IPAH than in age and sex-matched control subjects (11.4±0.9fl vs. 10.3±0.9fL and 14.3±2.9% vs. 11.9±1.9%, respectively; p=0.000). Pearson's correlation analysis revealed that MPV and PDW correlated positively with right ventricular systolic pressure, mean pulmonary arterial pressure and pulmonary vascular resistance. After a mean follow-up of 14±8 months, 12 patients died of right heart failure. Receiver operating characteristic analysis showed that MPV and PDW could not predict all-cause mortality. Multivariate Cox regression analysis suggested that right/left ventricular end-diastolic diameter ratio and NT-proBNP were independent predictive parameters of all-cause mortality.
  
  
  CONCLUSIONS
  Our results suggest that MPV and PDW were elevated in patients with IPAH. They could partly reflect disease severity, but did not predict prognosis.
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Ya-Guo
authors.initials: YG
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China. Electronic address: xiongcm2000@163.com.
authors.forename: Chang-Ming
authors.initials: CM
authors.lastname: Xiong
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: He
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Gu
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Zhi-Hui
authors.initials: ZH
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Xicheng District, Beijing, 100037, China.
authors.forename: Xin-Hai
authors.initials: XH
authors.lastname: Ni
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D018450:Disease Progression; D065627:Familial Primary Pulmonary Hypertension / Q000097:blood* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000097:blood / Q000503:physiopathology; D008297:Male; D063847:Mean Platelet Volume; D015999:Multivariate Analysis; D015539:Platelet Activation; D010976:Platelet Count; D011237:Predictive Value of Tests; D011379:Prognosis; D016016:Proportional Hazards Models; D012372:ROC Curve; D012189:Retrospective Studies; D012720:Severity of Illness Index; D055815:Young Adult
chemical_list: D015415:Biomarkers
keywords: Idiopathic pulmonary arterial hypertension; Mean Platelet Volume; Platelet Distribution Width; Prognosis; Pulmonary arterial hypertension