Plasma brain natriuretic peptide concentrations in patients with chronic mitral regurgitation.
OBJECTIVE
Patients with chronic mitral regurgitation (MR) are often referred for surgery only after irreversible left ventricular (LV) dysfunction has developed. Our aim was to determine whether plasma brain natriuretic peptide (BNP) concentrations could serve as a marker for early LV dysfunction in this condition.


METHODS
Twenty-two patients with isolated chronic MR and echocardiographic evidence of at least moderate regurgitation were studied.


RESULTS
Plasma BNP concentrations were significantly higher in patients than in normal volunteers (20.85 +/- 16.9 versus 3.37 +/- 0.9 pmol/l; p = 0.007). Concentrations increased with increasing severity of symptoms and were highest in those in NYHA class IV, but did not correlate with LV dimensions, fractional shortening or left atrial size. Of note, two asymptomatic patients with high BNP concentrations were referred for surgery within the 12-month follow up period due to symptom progression.


CONCLUSIONS
Plasma BNP concentrations are elevated in most patients with isolated chronic MR, including those who are asymptomatic with normal LV dimensions. The significance of these findings is uncertain, but they suggest that changes in ventricular physiology occur early in the disease process and before they can be detected echocardiographically. Longitudinal studies are required to determine if patients with high BNP levels have an adverse prognosis and if this can be altered by earlier surgical intervention.
Brookes
C I
CI
Department of Cardiology, Royal Brompton Hospital, London, UK.
Kemp
M W
MW
Hooper
J
J
Oldershaw
P J
PJ
Moat
N E
NE
D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood; D002908:Chronic Disease; D018450:Disease Progression; D004452:Echocardiography; D005260:Female; D005500:Follow-Up Studies; D006333:Heart Failure / Q000097:blood / Q000000981:diagnostic imaging / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000097:blood* / Q000150:complications / Q000000981:diagnostic imaging; D020097:Natriuretic Peptide, Brain; D009419:Nerve Tissue Proteins / Q000097:blood*; D011863:Radioimmunoassay; D012720:Severity of Illness Index; D018487:Ventricular Dysfunction, Left / Q000097:blood* / Q000150:complications / Q000000981:diagnostic imaging
D015415:Biomarkers; D009419:Nerve Tissue Proteins; D020097:Natriuretic Peptide, Brain