Is hormonal activation during exercise useful for risk stratification in patients with moderate congestive heart failure?
BACKGROUND
We previously demonstrated that A-type natriuretic peptide (ANP) at peak exercise was an independent predictor of cardiac survival. No data are available concerning the predictive value of B-type natriuretic peptide (BNP) at peak exercise.


METHODS
One hundred and fifty consecutive stable patients with moderate congestive heart failure (CHF) underwent echocardiography and a cardiopulmonary exercise test. Blood samples were drawn at rest and at peak exercise for the determination of plasma levels of ANP, BNP, and norepinephrine.


RESULTS
Exercise significantly increased plasma values of ANP, BNP, and norepinephrine. After a median follow-up period of 1171 days, there were 35 cardiac related deaths. Mortality rates at 1 and 2 years were 4% and 8%, respectively. Independent predictors of cardiac survival were percent of maximal predicted oxygen consumption (RR = 4.8 [2.1-11], P =.002), BNP at rest (RR = 2.5 [1.2-5.6], P =.01), and left atrial diameter (RR = 2.8 [1.2-6.5], P =.02).


CONCLUSIONS
In patients with stable, moderate CHF, plasma levels of ANP, BNP, and norepinephrine measured at peak exercise did not improve risk stratification. However, in addition to percent of maximal predicted oxygen consumption and left atrial diameter, plasma level of BNP at rest was an independent predictor of survival in CHF patients with low risk of cardiac events.
TOP Service de Cardiologie C, Hôpital Cardiologique, Lille Cedex, France. pdegroote@chru-lille.fr
Pascal
P
de Groote
Benoît
B
Soudan
Nicolas
N
Lamblin
Nathalie
N
Rouaix-Emery
Eugène
E
Mc Fadden
Thibaut
T
Meurice
Frédéric
F
Mouquet
Christophe
C
Bauters
D009320:Atrial Natriuretic Factor / Q000097:blood; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005500:Follow-Up Studies; D006325:Heart Atria / Q000473:pathology; D006333:Heart Failure / Q000097:blood* / Q000175:diagnosis / Q000401:mortality / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D008771:Nordefrin / Q000097:blood; D010100:Oxygen / Q000378:metabolism; D011379:Prognosis; D018570:Risk Assessment / Q000379:methods; D013318:Stroke Volume; D016019:Survival Analysis
D020097:Natriuretic Peptide, Brain; D009320:Atrial Natriuretic Factor; D008771:Nordefrin; D010100:Oxygen