title: Acute effects of intravenous nesiritide on cardiac contractility in heart failure.
abstract: BACKGROUND
  Although nesiritide is a potent vasodilator, studies using myocytes and isolated muscle strips have shown that recombinant B-type natriuretic peptide (BNP; nesiritide) decreases contractility. We sought to determine whether nesiritide decreases contractility in heart failure patients.
  
  
  RESULTS
  Twenty-five heart failure patients underwent left heart catheterization (using a pressure-volume conductance catheter) and echocardiography at baseline and after a 2 mcg/kg bolus and 30-minute nesiritide infusion (0.01 mcg.kg.min). From invasive and noninvasive measurements, left ventricular (LV) systolic function indices were calculated, including ejection fraction, end-systolic elastance (E(es); single-beat invasive and noninvasive methods) and preload-recruitable stroke work (PRSW; noninvasive, single-beat method). The mean age was 60 +/- 11 years, 48% were male, 56% had coronary disease, and 64% had hypertension. Although nesiritide did not change LV ejection fraction, it did decrease contractility on pressure-volume analysis. Noninvasive E(es) decreased from 2.6 +/- 1.6 to 2.0 +/- 1.4 mm Hg/mL (P = .02). For those with reduced ejection fraction, E(es) decreased by invasive (P = .006) and noninvasive (P = .02) methods. PRSW decreased from 76 +/- 37 to 62 +/- 28 g/cm(2) (P = .003). On tissue Doppler imaging, nesiritide reduced the systolic annular tissue velocity of the mitral annulus from 8.0 +/- 1.9 to 6.9 +/- 1.3 cm/s (P = .04).
  
  
  CONCLUSIONS
  Nesiritide infusion acutely decreases derived measures of contractility and systolic function in patients with chronic heart failure.
authors.affiliation: Division of Cardiology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
authors.forename: Sanjiv J
authors.initials: SJ
authors.lastname: Shah
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Michaels
mesh_terms: D000208:Acute Disease; D006328:Cardiac Catheterization; D002302:Cardiac Output; D004452:Echocardiography; D005260:Female; D006333:Heart Failure / Q000000981:diagnostic imaging / Q000188:drug therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction / Q000187:drug effects*; D045283:Natriuretic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D020097:Natriuretic Peptide, Brain / Q000008:administration & dosage / Q000627:therapeutic use*; D011446:Prospective Studies; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013318:Stroke Volume; D013599:Systole / Q000187:drug effects; D016277:Ventricular Function, Left
chemical_list: D045283:Natriuretic Agents; D020097:Natriuretic Peptide, Brain