title: N-terminal-pro-brain natriuretic peptide, a surrogate biomarker of combined clinical and hemodynamic outcomes following percutaneous transvenous mitral commissurotomy.
abstract: OBJECTIVE
  To examine the relationship between plasma levels of N-terminal-proB type natriuretic peptide (NT-proBNP) and various echocardiographic and hemodynamic parameters in patients with mitral stenosis undergoing percutaneous transvenous mitral commissurotomy (PTMC).
  
  
  METHODS
  The study population consisted of 100 patients with rheumatic mitral stenosis who underwent PTMC. NT-proBNP levels in these patients were measured before PTMC and 48 hours after PTMC. These levels were then correlated with various echocardiographic and hemodynamic parameters measured before and after PTMC.
  
  
  RESULTS
  Eighty-one percent of the study population were women, and the most common presenting symptom was dyspnea which was present in 94% of the patients. Dyspnea New York Heart Association class correlated significantly with baseline NT-proBNP levels (r = 0.63; p < 0.01). The plasma NT-proBNP levels in these patients increased as echocardiogram signs of left atrial enlargement and right ventricular hypertrophy developed (r = 0.59, p < 0.01). Patients in atrial fibrillation had significantly higher NT-proBNP levels than patients in sinus rhythm. Baseline NT-proBNP levels correlated significantly with left atrial volume (r = 0.38; p < 0.01), left atrial volume index (r = 0.45; p < 0.01), systolic pulmonary artery pressures (r = 0.42; p < 0.01), and mean pulmonary artery pressures (r = 0.41; p < 0.01). All patients who underwent successful PTMC showed a significant decrease in NT-proBNP (decreased from a mean 763.8 pg/mL to 348.6 pg/mL) along with a significant improvement in all echocardiographic and hemodynamic parameters (p < 0.01). The percent change in NT-proBNP correlated significantly with the percent improvement noted with left atrial volume (r = 0.39; p < 0.01), left atrial volume index (r = 0.41; p < 0.01), systolic (r = 0.32, p < 0.01), and mean pulmonary artery pressures (r = 0.31, p < 0.01).
  
  
  CONCLUSIONS
  The decrease in NT-proBNP levels following PTMC reflects an improvement in clinical and hemodynamic status; hence, it is reasonable to suggest that NT-proBNP is helpful in evaluating the response to PTMC.
authors.affiliation: Department of Cardiology, SVIMS, Tirupati, Andhra Pradesh, India.
authors.forename: K P
authors.initials: KP
authors.lastname: Ranganayakulu
authors.affiliation: Department of Cardiology, SVIMS, Tirupati, Andhra Pradesh, India.
authors.forename: D
authors.initials: D
authors.lastname: Rajasekhar
authors.affiliation: Department of Cardiology, SVIMS, Tirupati, Andhra Pradesh, India.
authors.forename: V
authors.initials: V
authors.lastname: Vanajakshamma
authors.affiliation: Department of Cardiology, SVIMS, Tirupati, Andhra Pradesh, India.
authors.forename: C
authors.initials: C
authors.lastname: Santosh Kumar
authors.affiliation: Department of Cardiology, SVIMS, Tirupati, Andhra Pradesh, India.
authors.forename: P
authors.initials: P
authors.lastname: Vasudeva Chetty
keywords: Balloon mitral valvotomy; Left atrial volume; Mitral stenosis; N-terminal-proB type natriuretic peptide; Percutaneous transvenous mitral commissurotomy; Pulmonary artery pressures