title: Left ventricular filling pressure assessed by exercise TDI was correlated with early HFNEF in patients with non-obstructive hypertrophic cardiomyopathy.
abstract: BACKGROUND
  Hypertrophic cardiomyopathy (HCM) patients are more susceptible to suffer from heart failure with normal ejection fraction (HFNEF). Therefore, it is critical to evaluate the relationship between left ventricular filling pressure (LVFP) and HFNEF, even if a large proportion of HCM patients have normal LVFP at rest. The objective was to assess the correlation between exercise tissue Doppler imaging (TDI) and early HFNEF in HCM patients by treadmill exercise echocardiography combined with cardiopulmonary exercise test (CPET).
  
  
  METHODS
  Twenty-seven non-obstructive HCM patients and 31 age- and gender-matched healthy volunteers were enrolled in this study. All subjects underwent treadmill exercise echocardiography combined with CPET. N-terminal pro-brain natriuretic peptide (NT-proBNP) levels were analyzed before and after exercise.
  
  
  RESULTS
  Five HCM patients had normal LVFP at rest and increased after exercise. For this subgroup, the relationship between minute ventilation and carbon dioxide production (VE/VCO2 slope) and NT-proBNP levels were higher compared with controls and the subgroup with normal resting and stress LVFP, but was similar to the subgroup with elevated LVFP both at rest and after exercise.
  
  
  CONCLUSIONS
  Elevated LVFP after exercise suggested the occurrence of early HFNEF in patients with non-obstructive HCM.
authors.forename: Guodong
authors.initials: G
authors.lastname: Ma
authors.forename: Ming
authors.initials: M
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Gao
authors.forename: Zhaoping
authors.initials: Z
authors.lastname: Li
authors.forename: Weihong
authors.initials: W
authors.lastname: Li
authors.forename: Baoxia
authors.initials: B
authors.lastname: Chen
authors.forename: Jieli
authors.initials: J
authors.lastname: Feng
authors.forename: Hongyan
authors.initials: H
authors.lastname: Wang
authors.forename: Wenying
authors.initials: W
authors.lastname: Ma
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Aidong
authors.initials: A
authors.lastname: Shen
authors.affiliation: Department of Cardiology, Peking University Third Hospital, 100191 Beijing, China. fengxinheng2013@126.com.
authors.forename: Xinheng
authors.initials: X
authors.lastname: Feng
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000328:Adult; D002312:Cardiomyopathy, Hypertrophic / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D015150:Echocardiography, Doppler; D005080:Exercise Test; D005260:Female; D006333:Heart Failure / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D020097:Natriuretic Peptide, Brain / Q000097:blood; D010446:Peptide Fragments / Q000097:blood; D016277:Ventricular Function, Left / Q000502:physiology*
chemical_list: D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain