[Relationship between exercise capacity and brain natriuretic peptide in patients after cardiac surgery].
OBJECTIVE
Physical training in cardiac patients can increase exercise capacity and reduce plasma brain natriuretic peptide(BNP) concentration, but these effects may depend on the etiology of cardiac disease. The change in exercise capacity and BNP during the training period were investigated in patients with different cardiac diseases.


METHODS
Ninety-one patients after coronary artery bypass grafting(CABG) and 78 patients after valve replacement (VR) underwent a symptom-limited incremental cardiopulmonary exercise test before (1 month) and 6 months after physical training. Anaerobic threshold and peak oxygen uptake(peak-Vo2) were measured during the cardiopulmonary exercise test. Before each cardiopulmonary exercise test, a blood sample was obtained in the resting condition for measuring BNP.


RESULTS
Anaerobic threshold and peak-Vo2 were increased significantly from 1 month to 6 months in both groups. BNP in the CABG group indicated a tendency to decrease (194.6 +/- 155.3-->144.2 +/- 232.2 pg/ml, p < 0.1) from 1 month to 6 months. BNP in VR group was significantly decreased (159. 9 +/- 115.5-->112.8 +/- 131.7 pg/ml, p < 0.05) during the training period. The CABG group showed a significant negative correlation between peak-Vo2 and BNP at 1 month(r = -0.28, p < 0.01) and at 6 months(r = -0.39, p = 0.001). The VR group showed a significant negative correlation between peak-Vo2 and BNP at 6 months(r = -0.32, p < 0.01), but not at 1 month.


CONCLUSIONS
Six months of physical training in patients after cardiac surgery may improve exercise capacity and reduce BNP. BNP concentration in the VR group before physical training did not reflect functional capacity.
Akashi
Yoshihiro J
YJ
Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Sugao 2-16-1, Miyamae-ku, Kawasaki 216-8511.
Koike
Akira
A
Omiya
Kazuto
K
Osada
Naohiko
N
Maeda
Tomoko
T
Tajima
Akihiko
A
Oikawa
Keiko
K
Aizawa
Tadanori
T
Iinuma
Hiroyuki
H
Fu
Long-Tai
LT
Itoh
Haruki
H
D000368:Aged; D006348:Cardiac Surgical Procedures; D001026:Coronary Artery Bypass; D017079:Exercise Tolerance; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000503:physiopathology / Q000534:rehabilitation* / Q000601:surgery; D020097:Natriuretic Peptide, Brain / Q000378:metabolism*; D011184:Postoperative Period
D020097:Natriuretic Peptide, Brain